Senior Frontend Developer

Join the Frontend Chapter at Toss Securities! We create cutting-edge mobile products that operate in web views for Android and iOS apps, as well as desktop products for PC browsers and back-office operations, leveraging modern web technologies. Our goal is to simplify complex investment products, providing a sleek investment experience that is accessible to everyone. We utilize optimal engineering techniques to continuously display and trade vast amounts of real-time data seamlessly. Technologies We Use: React, Next.js, TypeScript: Building efficient UIs with component-based architecture and reducing bugs through static type checking. React-Query, Recoil, Jotai: Utilizing appropriate state management for server and client. Emotion, Vanilla-extract: Styling mobile products with emotion and desktop products with vanilla-extract. TDS (Toss Design System): Enhancing development productivity using our robust design system, contributing from bug reporting to component creation. WebSockets, SSE: Efficiently managing real-time data and optimizing server requests. YarnBerry, PNPM: Using package managers to their full advantage. Webpack, SWC, Babel: Improving development productivity with rapid build and deployment speeds. GitHub, GitHub Actions: Managing source code on GitHub with automated reviews by a minimum of two reviewers, supported by various GitHub bots performing static analysis and tests. Why Join Toss Securities Frontend Chapter? If you're a developer with a keen interest in investing, you can enhance both your development skills and investment knowledge simultaneously. Gain experience with various data visualizations such as charts, graphs, and tables while exploring how to optimize the performance of visualized real-time data. Experience handling real-time price traffic of up to 1400 TPS through sockets. Contribute to creating a design system exclusively for securities products. Participate in Engineering Days held every two weeks, where we share learning and insights on technology topics and development know-how through Tech Talks. We actively share knowledge and best practices to enhance productivity, even outside of Engineering Days. Engage with other frontend teams across different affiliates, fostering a culture of collaboration and knowledge exchange. We Are Looking For: Individuals with experience in operating web-based services. A passion for development and a strong desire for growth, even if only interested in investing. Understanding the importance of predictable code and executing it effectively.

About Toss Insurance- Toss Insurance specializes in managing and selling insurance, focusing on reducing financial risks for customers and providing tailored coverage through a trust-based approach to insurance design aimed at achieving maximum customer satisfaction.- We strive to create a virtuous cycle where designers who provide excellent service from the customer's perspective can achieve greater results by building a consultation environment that focuses solely on customer satisfaction, without excessive sales pressure, and fostering a healthy insurance ecosystem.- Our goal is to develop an insurance management platform where agents, employees, and the company can grow together by providing an optimal IT infrastructure that allows everyone to fully utilize their expertise.About Your Future Team- As a Frontend Developer at Toss Insurance, you will collaborate with various colleagues to develop mobile products that are integrated into the Toss app, as well as an admin panel for managing user data.- Toss Insurance adopts an agile approach to product improvement, with teams engaging in product planning and brainstorming sessions roughly every 1-2 weeks. We rapidly formulate hypotheses, deploy products, gather feedback from customers, and refine our hypotheses based on that feedback.- The chapter of frontend developers collaborates organically across all Toss affiliates. Regular chapter meetings, including 'Tech Talks,' facilitate knowledge sharing on new technology topics and development know-how, as well as the development of common libraries for UI components and asynchronous processing.- You will be joining a team that includes another frontend developer. For insights into a day in the life of a Toss Insurance frontend developer, check out the article [How Does a Toss Insurance Frontend Developer Spend Their Day?](https://toss.im/career/article/insu_dailylog_Frontend_Developer).- For more on the Toss frontend chapter, see [All About Toss Frontend Chapter](https://tosspublic.notion.site/cc9367e44ff6424181899f3cf250f5d2).Your Responsibilities- You will create various screens within the Toss Insurance section of the Toss app, enabling customers to experience the best insurance coverage at the right price.- You will enhance the insurance consultation and customer management systems of Toss Insurance, allowing agents to consult effectively with clients. This role will provide you with extensive technical experience, from infrastructure to the customer-facing screens.- We are improving our frontend development environment to ensure that our web services are built and deployed in just one minute, all while providing the best user experience.Who We Want- We are looking for someone who can confidently develop stable services using React and TypeScript.- It’s important that you can define problems based on provided design guidelines and implement solutions swiftly.- We need someone who is proactive in identifying and analyzing problems to suggest effective solutions, rather than just completing assigned tasks.- Experience in improving legacy code to fit modern development environments or rapidly learning new tech stacks is a plus.Resume Tips- Instead of merely listing your experiences, please highlight the impact and learning points from your past work.- As we prioritize improving product quality based on customer feedback, we are looking for candidates who actively attempt to solve given problems.- If you have experience implementing complex services or demanding requirements, especially abstracting complicated or repetitive issues into simpler forms, please share.- Please mention any experience in gradually transitioning existing source code to a new codebase.Technologies We Use at Toss Insurance- Core: React, TypeScript, Next.js- State Management: React-Query, Recoil- Styling: Emotion- Package Managers: Yarn Berry, PNPM- Build: Webpack, ESBuild, SWC, Babel- CI/CD: GitHub Actions, CircleCI

# About the Team You Will Join- As a Frontend Developer at Toss Bank, you will be part of a purpose-driven team/squad and simultaneously belong to the Frontend Chapter, a functional organization. Frontend Developer in the Product Organization- At Toss Bank, product and service development occurs within team/squad units, where various roles such as PO/PMs, designers, frontend/server developers, and data analysts collaborate with high levels of autonomy and accountability, akin to a startup. Frontend Developer Lead in the Chapter- With the growth of the chapter, the F-Lead (Frontend Lead) role has emerged to effectively manage smaller groups. Each group comprises 4-5 Frontend Developers handling similar products, with the F-Lead guiding these teams.- By fostering a deep understanding and empathy for the product, you will lead high-quality engineering discussions to set technical goals and explore directions.- Interested in learning more about the Toss Bank Frontend Chapter? [→ *We are building a bank on the web*](https://toss.im/career/article/tossbank-frontend-interview)- Curious about the growth opportunities post-joining? [→ *A week in the life of a Toss Bank Frontend Developer*](https://toss.im/career/article/tossbank-frontend-oneweek) # Role of the Frontend Developer LeadThe F-Lead plays a pivotal role in providing engineering leadership within the Frontend Chapter. This position involves leading a group, managing development discussions and issues, and outlining technical directions. It extends beyond simple feature development to encompass continuous service improvements.The ideal candidate will possess practical technical skills and be capable of engaging in various activities that promote team growth.- Execute frontend operations promptly based on technical excellence, achieving product growth through appropriate direction.- Manage technical debt and establish a clear vision, leading the group’s engineering meetings to drive discussions.- Foster connections among fellow developers, inspiring growth, career development, and motivation for tangible changes.- Monitor project status, provide input for resource allocation, and enhance the development environment and processes.- As a Frontend Developer in a team/squad organization, you will collaborate with other roles such as planning, design, and data analysis to create and develop products aimed at user growth. # We Are Looking For- A leader who aspires to support and empower colleagues to work more effectively rather than merely managing them.- Someone who proactively identifies problems and collaborates with teammates to find solutions, beyond just completing assigned tasks.- A person with the ambition and goals to create a significant business impact through development.- An individual who prioritizes user experience and aims to maximize service accessibility and performance. # Technologies Used at Toss Bank- Core: React, TypeScript, Next.js- State Management: React-Query, Jotai, Zustand- Styling: Emotion, Panda CSS- Package Managers: Yarn Berry, Bun- Build Tools: Webpack, Rollup, ESBuild, SWC, Babel- CI/CD: GitHub Actions, GoCD # Joining Toss Bank Journey- Application Submission > Preliminary Task > Job Interview > Cultural Fit Interview > Reference Check > Compensation Negotiation > Final Acceptance and Onboarding # Important Notice- If false information is found in your resume or documents, or if disciplinary actions during your employment history are confirmed, recruitment may be canceled.- According to Toss Bank's employment regulations, candidates with disqualifying factors may also have their recruitment canceled.- Individuals with disabilities and those eligible for national veterans' benefits will be favored during the application process.

Welcome to Toss PaymentsToss Payments is committed to understanding the challenges and inefficiencies businesses face, aiming to provide comprehensive solutions across technology and operations. Our goal is to deliver a seamless and convenient service experience for consumers while creating an environment where merchants can focus solely on their business.We work under the principle of 'innovating the electronic payment market', fostering a culture of mutual trust and collaboration. We are looking for colleagues who are eager to help shape the future of the payment industry!About the Team You Will JoinThe Frontend Developer position at Toss Payments is part of both the product team and the frontend chapter. Within the product team, you will collaborate with Product Managers, Product Designers, Server Developers, and fellow Frontend Developers to tackle complex projects in the payment domain, creating sustainable and high-quality services over time. You will have the opportunity to refine and specify the products that leverage your strengths during the interview process.The frontend chapter operates like a cohesive team! We hold regular chapter meetings and share new technology topics or development insights during 'Lightning Talks.' Participate in mob programming, interface design reviews, and various challenges that encourage continuous growth!This year, the frontend chapter aims to scale significantly to support the smooth operation of Toss's growing business.What We Have Accomplished So FarWe developed the payment widget to enable anyone to easily create their desired payment experience after thorough consideration.We designed and applied an intuitive and scalable payment SDK architecture that meets numerous requirements.We are enhancing dashboards and admin products to effectively address the complex policies and management elements from merchant contracts to payments and settlements.Beyond product development, we take the lead in reducing various inefficiencies within the company through the establishment of testing automation platforms, design standardization, and sharing development capabilities.Future Challenges We Want to Tackle TogetherWe look forward to crafting products that flexibly accommodate complex requirements. We are already applying technical challenges to effectively manage complexity in the payment domain while maintaining scalability. However, to drive these goals forward, we need more teammates to support us.We aim to completely eliminate accumulated legacy.The long-standing electronic payment market has not been without its technical debt. We are seeking individuals who can analyze areas that are hard to control or manage, rapidly reconfigure them with new technologies, and help create an environment where the business can grow swiftly.Who We Want to Work WithIndividuals who place high value on developer experience.Those who understand and practice the importance of automated testing.Enthusiasts of new technologies and various platforms.Individuals keenly interested in programming languages.Those who find joy in simplifying complex business challenges.Experience We ValueExperience with static type analysis using TypeScript or Flow is a plus.Experience in server-side rendering (SSR) and web app development within mobile applications is a plus.Experience in UI development considering responsive design, web accessibility, and web standards is a plus.Experience in test and deployment automation is a plus.Experience in configuring the operational infrastructure of web services or creating product monitoring systems is a plus.

About the Role Toss is looking for a Frontend Developer in Seoul to help build and improve web applications. This role works closely with designers and backend engineers to deliver smooth, effective user experiences. The team values modern frontend development and keeps up with current technologies. What You Will Do Develop and maintain web applications for Toss products Work with designers to translate UI/UX designs into functional interfaces Collaborate with backend developers to integrate APIs and data Use current frontend tools and frameworks as part of daily work Location This position is based in Seoul.

Join Our Dynamic Team! At Toss Bank, we focus on evaluating potential through the quality of your experiences and the expected growth in your career, rather than just years of service. About the Team You Will Join Our squads consist of 1-3 Frontend Developers collaborating closely to foster both service development and personal growth. As a service-oriented squad, we operate with autonomy, with teams ranging from 4 to 15 members, akin to small startups. The Frontend chapter at Toss Bank collaborates like a cohesive unit, sharing new technologies and development expertise through weekly meetings. Want to learn more about our Frontend chapter?→ *We are building a bank on the web*(https://toss.im/career/article/tossbank-frontend-interview) Curious about the growth opportunities after joining?→ *A week in the life of a Toss Bank Frontend Developer*(https://toss.im/career/article/tossbank-frontend-oneweek) Your Responsibilities You will develop a wide range of services, from internal operating systems to customer-facing financial services like account creation, card applications, savings, and loans. Enhance productivity by building libraries and automation tools, continuously improving the frontend development environment for optimal user experience. You will also work on common services like the Toss Bank homepage and corporate user services. Who We Are Looking For Individuals with experience in server-side rendering (SSR) and developing web applications within mobile apps. Passionate developers who enjoy understanding user flows deeply and enhancing user experiences for greater convenience and efficiency. Proactive problem solvers who can articulate and share their ideas logically. Those interested in automating and improving Frontend Operation systems (CI, CD, etc.). The Services You Will Manage You will create financial services such as savings, loans, credit cards, funds, and asset management that users directly engage with, including innovative products like 'Group Savings' and 'Grow Savings'. Take responsibility for the entire process from credit evaluation to card issuance and user experience, while driving growth through data-driven experiments that enhance MAU, profitability, and customer satisfaction.

Join Toss Payments as a Frontend Developer and be part of a dynamic team that builds user-friendly payment solutions. While we primarily seek candidates with over 4 years of experience, we also welcome passionate developers with at least 3 years of experience to apply for other positions listed in our job postings!About the Team:The Frontend Developer role at Toss functions within a matrix structure, collaborating closely with Product Owners, Designers, Server Developers, and Data Analysts to deliver innovative services and products.The Frontend Chapter operates as a cohesive team, sharing knowledge through regular 'Tech Talk' sessions and engaging in collaborative library development and code reviews.This year, our goal is to scale the Frontend Chapter to meet the growing demands of Toss's business, ensuring smooth operations across our platforms.Your Responsibilities:Develop safe and user-friendly payment interfaces.Create various B2B SaaS products to support merchant businesses.Enhance the frontend development environment with a focus on delivering exceptional user experiences and contribute to the creation of shared libraries like TDS.What We Are Looking For:Proficiency in SPA frameworks such as React, Vue, or Angular.Strong understanding of HTML, CSS, and JavaScript.A keen appreciation for UI/UX principles.Experience with distributed version control systems like Git.Please Highlight These Experiences on Your Resume:Experience with static type analysis in JavaScript using TypeScript or Flow.Familiarity with server-side rendering (SSR) and development of web apps within mobile applications.Experience in UI development considering responsive design, web accessibility, and web standards.Experience with testing and deployment automation.Proficiency in using module bundlers like Webpack.Technologies We Use:Core: React, TypeScript, Next.jsState Management: React-QueryStyling: EmotionPackage Manager: Yarn Berry

주요 업무개발 및 개선: 토스신용카드, 내 보험 조회, 행운퀴즈 등 토스 앱의 웹 서비스.PC 웹 서비스: 토스 홈페이지 등 다양한 웹 서비스 개발.사용자 경험: 완벽한 사용자 경험을 위한 프론트엔드 개발 및 배포 환경 개선 참여.UI 라이브러리: 사내 프론트엔드 공통 UI 라이브러리(TDS) 개발.

Join Our Team!As a Node.js Developer at Toss Securities, you will be part of the Automation Platform Team.The Automation Platform Team is dedicated to creating and managing customer-facing services that provide a unique experience for users of Toss Securities, along with internal services that support these offerings.Your role will involve designing and implementing a range of automation platforms that help employees and customers shift their focus from repetitive tasks to more valuable work. What You Will Do:Develop Node.js-based applications that operate in diverse environments, including server and client-side applications.Write libraries and test code to create stable and observable services. We Are Looking For:A candidate with a deep understanding of Node.js, TypeScript, and Nest.js, or someone with ample practical experience in other server-side environments (like Spring) who is ready to transition to the Node.js ecosystem.Experience in designing and operating distributed applications, with the ability to define and resolve issues related to concurrency, atomicity, and parallel processing.Familiarity with log collection and monitoring for stable service operations.Ability to write flexible, readable, and maintainable code.Skills in identifying repetitive or inefficient processes and proposing better alternatives. Resume Tips:Describe challenges encountered during projects and how you solved them.Summarize your thoughts on good coding or design philosophy. Technologies Used at Toss Securities:Typescript, NestJS, pnpm, VitestELK Stack, ZooKeeper, Redis, Kafka

Join Our Team! At Toss Securities, our Server Chapter is filled with enthusiastic colleagues who are eager to collaborate and create meaningful advancements. We thrive on constructive discussions and innovative problem-solving, where every idea is valued, and constructive criticism is encouraged. We enjoy engaging in technical discussions and hold various study sessions. Whether you're new to the field or an experienced professional, you'll find opportunities to expand your knowledge and apply what you've learned in practical ways. Our active code review process ensures that you gain hands-on technical expertise. As a Server Developer at Toss Securities, you'll work across various teams, including Product Owners, Designers, Frontend Developers, and Data Analysts, in a dynamic environment similar to a startup. You'll also engage with specialized teams managing core financial data and ensuring the stability of our services. We are dedicated to developing back-office products that alleviate the inconvenience of visiting physical locations, creating a seamless experience for our users. Worried about communication with fellow developers across different teams? Don't be! Our community supports strong collaboration through code reviews, Engineering Days, and weekly Server Chapter meetings. Your Responsibilities We primarily utilize Java/Kotlin and the Spring Framework for server development. You will engage in selecting and standardizing efficient development practices and libraries. You will also focus on improving our architecture for easy deployment and maintenance, ensuring stability and performance. Working with technologies like Redis, Kafka, Kubernetes, and ELK, you'll tackle challenges related to high traffic and concurrent processing. You will be responsible for creating various aspects of the Toss Securities service, from real-time data processing to managing user account information and stock transactions. You will have ownership of your product areas and will make key technical decisions. Who We Are Looking For We seek individuals who are persistent problem solvers. You should be comfortable tackling complex challenges and delivering valuable solutions for our customers. A broad mindset is essential, as we sometimes need to take bold steps to simplify issues. We value individuals who are open to collaboration and are willing to take initiative, even when responsibilities may not be clearly defined.

#LI-DNI Join the Frontend Chapter at Toss Securities, We are developing modern web solutions for mobile products running on Android and iOS app web views, desktop products for PC browsers, and back-office systems for operations. Our mission is to simplify complex investment products into an elegant experience that is accessible to everyone. We leverage cutting-edge engineering techniques to seamlessly present real-time data and facilitate transactions. We use the following technologies: React, Next.js, Typescript: Building efficient UI with component-based architecture and minimizing bugs through static type checking. React-Query, Recoil, Jotai: Utilizing state management for server and client as per requirement. Emotion, Vanilla-extract: Implementing emotion for mobile product styling and vanilla-extract for desktop product styling. TDS (Toss Design System): Enhancing development productivity through our robust design system and contributing from bug reporting to component creation. WebSockets, SSE: Efficiently managing real-time data processing and optimizing server requests. YarnBerry, PNPM: Adapting package managers to fit our needs. Webpack, SWC, Babel: Accelerating development productivity with rapid build and deployment speeds. Github, Github Action: Managing source code via Github and conducting code reviews with automated assignment of at least two reviewers, supported by various Github Bots for static analysis and testing reports. What you can expect in the Toss Securities FE Chapter: If you're a developer passionate about investing, you'll enhance both your development skills and investment knowledge. Experience diverse data visualizations such as charts, graphs, and tables, and learn how to optimize the performance of visualized real-time data. Handle real-time traffic of up to 1400 TPS through sockets. Gain experience in creating a design system specifically for securities products. Participate in bi-weekly Engineering Days to share knowledge and discuss technology topics or development tips in Tech Talks. Even outside of Engineering Days, we actively share productivity-enhancing insights, newfound knowledge, and lessons learned from mistakes. Engage in a culture of communication and sharing with frontend chapters from other affiliates. We are looking for someone who: Has experience in operating web-based services. Even if you only have an interest in investing, we welcome passionate developers eager to grow. Values the importance of predictable code and actively implements it.

Join Our Security Team! The security team at Toss Securities is composed of dedicated professionals, including a CISO, Security Engineers, Security Researchers, Information Security Managers, and Privacy Managers. We are committed to creating secure services, receiving robust support from the entire organization, and collaborating effectively across all departments. Our team members, with diverse experience ranging from 1 to 20 years, primarily come from backgrounds in information security firms and corporate security roles. We actively share knowledge and collaborate to achieve common goals. To ensure the safe operation of our securities services, we conduct vulnerability assessments across various fields such as applications, cloud, infrastructure, and network. We are also developing automated testing systems using DAST, SAST, and IAST tools to enhance our testing framework. Your Responsibilities: Collaborate with relevant departments from the service planning stage to perform security reviews and provide guidelines for safe service implementation. Conduct vulnerability assessments on Toss Securities' internal and external services (WTS, MTS, operational systems, etc.), analyze results, and suggest improvements. Perform infrastructure vulnerability assessments as required by electronic financial regulations and domestic/international security certifications (Public/Private Cloud, Server, DBMS, Network, etc.). Execute scenario-based internal/external penetration tests and conduct preliminary checks to prevent internal information leaks. Who We're Looking For: Individuals with over 7 years of experience in vulnerability assessments. Experience in operating or conducting assessments with infrastructure vulnerability assessment tools. Experience in developing tools or automation programs for vulnerability assessments. Ability to perform REST API vulnerability assessments based on an understanding of MSA environments. Experience in security audits identifying vulnerabilities such as IDOR in Java or Kotlin source code. Experience in assessing application vulnerabilities in Android or iOS environments. Understanding of electronic financial services and securities systems is a plus. Experience or understanding of Attack Surface Management is a bonus. Application Tips: Include any services or programs you've developed or participated in, specifying the language, role, deployment status, and operational environment. Detail specific vulnerabilities identified through SAST, DAST, Image Scanning, Secret Scanning, and your corrective actions (company/service names can be anonymized). Explain how you assessed and responded to actual security incidents or potential risks, such as secret exposure or high-risk image vulnerabilities. Share challenges and solutions encountered during security assessment automation or policy application processes. Hiring Process at Toss Securities: Application submission > Job interview > Cultural fit interview > Reference check > Salary negotiation > Final acceptance and onboarding. Additional Information: Providing false information in your resume or discovering disciplinary actions in your employment history may lead to termination of the recruitment process.

Join the Toss Securities Frontend Chapter!At Toss Securities, we are dedicated to creating innovative mobile products that seamlessly integrate native Android and iOS applications with web views using modern web technologies. Our mission is to simplify complex investment products, ensuring that everyone can enjoy a user-friendly and sleek investment experience.We leverage cutting-edge engineering techniques to showcase real-time data without interruptions, optimizing performance for our users.Your Responsibilities:- Optimize performance across various domains including browser, CDN, and network to provide the best user experience for over 2.5 million daily active users and 90,000 concurrent users.- Provide guidance and modules to product developers for easy performance optimization.- Actively manage a redundant deployment infrastructure utilizing cloud services such as AWS and Cloudflare.- Develop monitoring and error response tools tailored for real-time traffic.- Build a self-service MFA development framework that allows independent development across teams.- Provide a client log SDK operated by Toss Securities.- Create a development environment that facilitates a smooth transition between native and web view screens, free from compatibility issues.What We've Achieved:- Our mobile products at Toss Securities operate as a unified service, employing a Micro Frontend Architecture (MFA) to reduce complexity in product development.- Implemented a SharedWorker-based module to optimize WebSocket communication for our PC platform.- Established a deployment pipeline that supports rapid and reliable FE platform releases multiple times a day.What We're Looking For:- A deep understanding of frontend development and deployment environments.- Proven experience in identifying and improving issues within these environments.- Experience in accurately analyzing and resolving root causes beyond merely solving problems.- A background in automating frequent tasks to a high degree.- A keen interest in testing within frontend environments.Resume Tips:- Highlight the impact and learning points from your experiences, rather than just listing them.- Share your understanding of web browser mechanics and any experiences that improved web service performance.- Provide details on your understanding of transpiling and bundling, especially in supporting a wide range of browsers efficiently.- Mention any experience managing multiple packages within a single monorepo.- Discuss your proactive approach to researching and adopting new technologies.Technologies We Use:- Core: React, TypeScript- Package Managers: PNPM, Yarn- Build Tools: ESBuild, Vite, Webpack, SWC, Babel- Infrastructure: AWS, CloudFlare, Terraform- Monitoring: Sentry, Grafana- CI/CD: GitHub Actions, GoCDYour Journey with Toss Securities:- Application submission > Pre-assessment task > Technical interview > Cultural fit interview > Reference check > Offer negotiation > Final acceptance and onboarding.Please Note:- Any false information in your resume or disciplinary issues during your employment history may result in cancellation of recruitment.- Candidates subject to hiring restrictions according to Toss Securities regulations may also be disqualified.- Individuals with disabilities and veterans will be given preferential consideration in accordance with relevant laws.- The job title upon joining will be 'Frontend Developer'.A Message to Future Colleagues:"We support our best colleagues to achieve exceptional performance."

Join Our Innovative TeamAs a Product Owner at Toss Securities, you will become part of a dedicated product organization known as a 'silo'. This agile team comprises 6-8 professionals, including fellow POs, developers, product designers, and data analysts, all working together with the autonomy of a small startup, making independent decisions regarding product development.In your role, you will connect user needs with Toss Securities' business strategy, creating accessible investment services that enhance customer experiences.Your responsibilities will span the entire product lifecycle, from defining key metrics and designing business models to driving action items and achieving tangible results.You will establish valid hypotheses, validate them through experimentation, and leverage data insights to refine the product, ensuring a strong Product-Market Fit.As a leader, you will set goals and strategies for business direction, revenue, and profits, engaging in thorough discussions with your silo team to determine the best course of action.This role is akin to being a CEO of a small startup—addressing challenges head-on, defining problems, and experiencing the highs and lows of entrepreneurial ventures.Your responsibilities extend beyond the launch of new financial products; you will also work on cross-activation services, create community platforms, and develop asset management services.Ideal Candidate ProfileWe prefer candidates with a profound understanding of mobile products over securities domain knowledge, as Toss Securities operates with a tech-first mentality.Experience depth may not correlate directly with years; we do not impose strict experience limits.Relevant experience in an agile environment, delivering meaningful business and product outcomes through both success and learning from failures is essential.An analytical mindset is crucial for solving diverse and complex challenges using data.Experience in defining problems from a user perspective and implementing solutions is highly valued.Founders with A to Z experience in startups, from business/product planning to organizational operations, will find this role particularly appealing.Resume TipsClearly outline the problems defined, hypotheses established, actions taken, and results achieved for each product/service/project you have handled.Highlight impactful experiences and learning points instead of simply listing tasks to showcase your strengths.Ensure your resume reflects your ability to drive product success and learning effectively.

About the Team You Will Join The Frontend Developer position at Toss is part of both a silo and the frontend chapter in a matrix structure. At Toss, products and services are developed within silo teams consisting of 6-8 professionals, including Product Owners, Designers, Server Developers, Frontend Developers, and Data Analysts, allowing for a startup-like autonomy. The frontend chapter collaborates closely like a single team! We conduct weekly chapter meetings to share new technology topics and development insights through 'Tech Talks', as well as engage in library development and code reviews for UI components and asynchronous processes. This year, the frontend chapter aims to scale its resources to ensure Toss's increasingly demanding business operations run smoothly. Your Responsibilities You will play a key role in identifying the market potential of Toss products and nurturing them into mature services. Toss implements various web pages within its app, collaborating with partners to continuously update services much like a native app. We are enhancing our frontend development environment to ensure web services can be built and deployed in just one minute, maximizing user experience. The Ideal Candidate Proficiency in SPA frameworks like React, Vue, or Angular is preferred. We seek individuals who can proactively identify problems and propose solutions rather than merely executing assigned tasks. Experience with static type analysis in JavaScript using TypeScript or Flow is a plus. Resume Tips Instead of simply listing experiences, please describe your impact and learning points from your past roles. We value candidates who attempt to solve problems independently as we rapidly iterate on product completeness based on customer feedback. If you have experience with server-side rendering (SSR) or web app development within mobile apps, please highlight this. Detail any experience you have in gradually migrating existing source code to a new codebase. For military personnel, please include detailed information regarding your service status in your resume, as industrial personnel can transition and research personnel can change roles. Technologies Used at Toss Core: React, TypeScript, Next.js State Management: React-Query, Recoil Styling: Emotion Package Managers: Yarn Berry, PNPM Build Tools: Webpack, ESBuild, SWC, Babel

Join Our Team! At Toss Bank, we are dedicated to developing a wide range of frontend products, while also designing and building internal banking systems for operational efficiency. Our squads, which consist of 4 to 15 members, operate autonomously like small startups, focused on creating exceptional services and products. The Toss Bank Frontend Chapter collaborates seamlessly, conducting weekly meetings to address technical debt and sharing insights on new technologies and development practices through 'Lightning Talks'. Your Responsibilities Include: Developing products aimed at revolutionizing the banking system in South Korea and enhancing team productivity. Identifying and automating repetitive, manual operational tasks such as ID verification, seizure and collection processes, certificate issuance, and financial transaction information provision to maximize efficiency. Participating in the design process by understanding business requirements and crafting user interfaces. Optimizing admin UX/UI by platforming internal operational tools, thereby enhancing development productivity. We Are Looking For: A candidate with a strong understanding and experience in React. Proficiency in TypeScript to develop reliable and testable applications. A passion for understanding user perspectives and building systems that enhance operational efficiency beyond basic feature implementation. Proactive problem-solving skills and the ability to articulate ideas effectively. Experience in building admin products is a plus. Experience in developing dashboards and reporting functionalities for service operations is a plus. A background in enhancing operational efficiency and automation beyond basic CRUD operations is a plus. Technologies We Use: Core: React, TypeScript, Next.js State Management: React-Query, Jotai, Zustand Styling: Emotion, Panda CSS Package Manager: Yarn Berry, Bun Build: Webpack, Rollup, ESBuild, SWC, Babel CI/CD: GitHub Actions, GoCD Your Journey to Joining Toss Bank: Application submission > Pre-assignment > Job Interview > Cultural Fit Interview > Reference Check > Compensation Discussion > Final Acceptance and Onboarding Important Notes: This position is a contract role with a duration of 1 year. If any false information is found in the resume or if disciplinary issues are confirmed in the work history, the employment offer may be revoked.

About the Team You'll Join The Security Division at Toss Bank comprises several teams including the Security Policy Team, Privacy Protection Team, System Security Team, Network Security Team, Security Red Team, Security Blue Team, IT Service Team, and Security Audit Team. The System Security Team Leader is responsible for safeguarding devices and systems within Toss Bank against various external threats while leading the System Security Team. The Security Division collaborates with various teams to create a safe and reliable service for Toss Bank customers. The System Security Team, in particular, focuses on ensuring secure services from both system/device security and operational perspectives, working closely with product organizations, legal and compliance, platform engineering, and internal audit teams. Responsibilities You'll Have Develop and execute operational plans for device and system information security solutions to protect Toss Bank's customers, leading the team's technical growth and implementation. Design and enhance integrated security operations for device security, system security solutions, AI, and supply chain security. Establish strategies to ensure visibility from a systems security perspective and create an environment that supports optimal operations. Who We're Looking For Individuals with over 10 years of diverse experience in operating security solutions are essential. Experience in directly leading a security team of three or more members to achieve team objectives is highly desirable. Knowledge of operational strategies for device and system security solutions aimed at ensuring safe electronic financial transactions is necessary. Deep understanding of the principles of security solutions, with the ability to set standards for operational policies and guide team discussions for optimal decision-making is required. Experience in automating repetitive tasks to enhance productivity and a proven track record of deep diving into problem-solving are sought after. Familiarity with various open-source tools and the ability to utilize AI in work processes are preferred. Experience in script development using Bash, Python, and API utilization for system integration is necessary. Resume Submission Guidelines We recommend submitting a resume in a free format along with a portfolio. Your application should highlight experiences and knowledge relevant to the role. Present specific contexts and outcomes rather than simply listing responsibilities, focusing on how you solved problems. Detail your leadership experiences, including team size, operational methods, personal contributions, and team achievements. Include any experience in establishing security strategies or improving systems that influenced the entire organization. It would be beneficial to attach examples that demonstrate your technical depth, such as architectures you have designed, problem-solving processes, or automation outcomes. Your Journey to Joining Toss Bank Application submission and...

Join the Frontend Chapter at Toss Securities!We are developing mobile and desktop products using modern web technologies, including services for Android and iOS app web views and back-office operations.Our goal is to provide a sleek investment experience that makes complex investment products accessible to everyone while leveraging optimal engineering techniques to display real-time data seamlessly.About the TeamCollaborate with Platform Designers to define what constitutes an excellent UX for Toss Securities services.Assist designers in creating high-quality UX designs and develop tools that simplify implementation for developers.Your ResponsibilitiesDevelop and maintain the design system utilized in Toss Securities services.Establish principles and structures that ensure the design system provides consistent and scalable interfaces.Define UX rules such as responsive design, keyboard usability, and loading experiences to ensure comfortable use across all environments.Create a “Design Linter” that allows designers to receive suggestions for improved UX directly in design editor tools.

Join Our Team! The Network Engineering team is tasked with establishing Toss Securities' network and security systems, along with managing data center operations. We collaborate with exceptional team members from diverse sectors including finance, commerce, portals, and gaming. Our goal is to support product focus by ensuring infrastructure capable of handling large-scale traffic and driving automation for quicker product releases. Your Responsibilities: Install and maintain Toss Securities' network and security devices, conducting regular status checks and resolving operational issues. Register and manage asset information for network and security devices (serial numbers, status, locations, etc.). Document work logs and change history for installation, migration, and decommissioning tasks. Oversee and enhance Toss Securities' network monitoring solutions. Provide rapid onsite response and first-level troubleshooting during incidents. Plan and support schedules for regular inspections of network and security devices. Be available for night or weekend maintenance when necessary. Manage cable connections for servers and storage, supervising cable installation by contractors. Who We Are Looking For: At least 5 years of experience in network technical support and field engineering. Understanding of network cabling standards and wiring practices is essential. Ability to respond effectively to incidents and perform basic network troubleshooting. Experience in collaborating with maintenance vendors and managing inspection documentation. Operational experience with major network equipment like Cisco and Arista is required; experience with Citrix NetScaler is a plus. Familiarity with security devices such as firewalls and VPNs, alongside a strong understanding of network security is preferred. Application Recommendations: In your resume, highlight a memorable case of technical problem-solving (optimization, bug fixing, etc.). Detail projects you've contributed to, including duration, roles, technology stack used, and improvements made. Your Journey with Toss Securities: Application submission > Job interview > Cultural fit interview > Final acceptance and onboarding. Please Note: This position is a contract role with a duration of one year. Any discrepancies in the resume or disciplinary records may result in cancellation of employment. Applicants subject to hiring restrictions or disqualifications as per Toss Securities' policies may have their applications canceled. Applicants with disabilities or veterans will receive preferential treatment in accordance with relevant laws. A Note for Future Colleagues: “At Toss Securities, you can experience both the constraints of a financial infrastructure and the trendy mobile services of an IT company!” The financial infrastructure in South Korea can be quite restrictive, limiting the breadth of experiences. However, at Toss Securities, you have the responsibility and authority to implement solutions that benefit the business, allowing for valuable experiences without being bound by irrelevant solutions dictated from above.