Frontend Developer at Toss Careers | Seoul

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.

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.

# 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.

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

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 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.

Join Toss Careers as a Software Engineer and be part of a dynamic team dedicated to innovation and excellence in technology. We are looking for talented individuals who are passionate about coding and eager to tackle exciting challenges in the tech landscape. This is an excellent opportunity to contribute to transformative projects that make a real impact.

Join Our Dynamic Team!The Server Developer (Product) role is part of Toss's innovative Silo team, comprising 6-8 diverse professionals, including product owners, designers, developers, and data analysts, collaborating like a startup with autonomy.As our user base grows, we have dedicated server developers ensuring stable operations. Unlike silo teams focusing on rapid experimentation, this role supports a variety of services across Toss.Your Responsibilities Include:Designing and developing the Product server used daily by countless Toss customers.Offering over 50 services since the inception of our convenient remittance service in 2015, including financial status checks, pedometers, and fortune quizzes.Utilizing trendy technologies to ensure services run smoothly while listening to user feedback to quickly and flexibly resolve issues.We Are Looking For Individuals Who:Have experience designing and operating high-availability, scalable systems.Possess a background in developing systems that handle large-scale real-time traffic.Have faced challenges and resolved issues during system failures.Are passionate about their services and approach their work with a sense of ownership.Enjoy sharing insights and ideas gained from service development and are eager for ongoing technical challenges.Services You Will Contribute To:Loans: Create services that allow users to easily compare and apply for various loans, expanding offerings such as personal loans, mortgage loans, and card loans to ensure Toss is top of mind.Marketplace: Develop essential services for users, like card benefit comparisons, investments, and auto insurance.Payments: Work on Toss's convenient payment system, TossPay, handling everything from online and offline payments to new payment method development and promotional activities.Commerce: Enhance Toss's commerce services to create value for both users and sellers, including group purchases and admin services for sellers.Benefits: Develop innovative services in the app tech space, including pedometers, live shopping, luck lotteries, and collaborative point-earning activities.Ads: Expand Toss's advertising business by reliably serving high-traffic products and developing integrations for ad networks.Home: Create services for the homepage that first engages Toss users, analyzing assets, income, and spending patterns while connecting them to relevant Toss services.

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 Dynamic Team! Become a part of the Toss Coffee Silo Barista Team, dedicated to serving the Toss community. Our mission is to enhance employee engagement through high-quality coffee and refreshing beverages. We are an integral part of the People & Culture Tribe's Community Team. Your Responsibilities: Deliver exceptional coffee and beverage services to Toss employees, ensuring the highest industry standards. Provide tailored coffee and drink options that cater to the individual preferences and needs of team members. Support team events and create memorable experiences by offering beverages during onboarding and external visits. Foster a renewed perception and culture of barista professionalism within the organization. Strengthen our One Team spirit by acting as a vital link between Toss and its subsidiaries. Who We Are Looking For: A professional barista with over 2 years of experience, excluding part-time roles, with exposure to various specialty coffees. Strong communication skills with a proven ability to collaborate effectively with diverse colleagues. A proactive mindset focused on continuous improvement in customer satisfaction. Experience in managerial roles, café ownership, or team leadership is a plus. Knowledge of menu development based on ingredient understanding is advantageous. Application Guidance: Please describe your motivation for applying to Toss Coffee Silo. Detail the efforts you have made to develop as a professional barista. Important Information: This is a contract position for the first year, with potential for extension or conversion to a full-time role based on performance. We offer top-tier compensation in the barista industry, including performance bonuses and additional cash benefits. Work hours are from 9 AM to 9 PM, with shifts scheduled accordingly. There are four office locations, and you will be assigned after the interview process. Your Journey with Toss: Application submission > Job interview > Cultural fit interview > Compensation negotiation >...

#LI-DNIAbout the Team You'll JoinThe Android Developers at Toss are embedded within a matrix structure, collaborating across silos and within the Android chapter.At Toss, services and products are developed within silo units consisting of 6-8 diverse roles, fostering an autonomous startup-like environment.In addition to silos, there are teams focused on developing shared modules within the Android codebase, engaging in deep technical discussions.Every Thursday, the Android chapter members gather for Engineering Day outside of silos, encouraging active knowledge exchange, technical discussions, and collaborative code reviews.As an Android Developer at Toss, you will have the opportunity to propose and implement new technologies alongside talented peers.Your ResponsibilitiesDevelop all Android app services for Toss, including remittance, account inquiries, credit checks, and Toss Card.Create innovative financial services such as Toss Bank and Toss Securities.Experience rapid iterations, releasing new features weekly to over ten million users.Utilize Toss's unique design system, TDS (Toss Design System), to complete UI in just one minute, allowing you to focus solely on core logic.We’re Looking For Someone WhoHas experience in developing commercial services.Is proficient in Kotlin development.Possesses a strong understanding of Android UI/UX guidelines.Resume RecommendationsShare experiences where you took initiative and responsibility for product quality and stability, continuously improving them.Highlight experiences where you immersed yourself in understanding technology and domain to add value to customers’ lives.If you aim for optimized interface design based on a deep understanding of Android and mobile in general, you are a great fit.Technologies We UseKotlinRxJava, Kotlin CoroutinesView System, Jetpack ComposeTDS (Toss Design System)Model-View-WhateverYour Journey to Joining TossApplication Submission > Pre-Task Assessment > Job Interview

Join our dynamic team at Toss Careers as a Research Assistant! In this role, you will engage in innovative research projects that drive our initiatives forward. Collaborate closely with cross-functional teams, analyze data, and present your findings to influence decision-making. We are looking for a motivated individual who is passionate about research and eager to learn.

The Network Engineer role at Toss is part of the Infra Engineering Tribe in Seoul. This team collaborates with System Engineers and InfraOps Engineers to deliver infrastructure that keeps Toss services reliable, fast, and secure. The work supports Toss’s mission to advance financial technology and innovation. Role overview Build and manage network infrastructure for a range of Toss services. Develop and operate monitoring systems to ensure smooth network operations. Optimize network performance, addressing issues to maintain high service quality. Requirements Less than 5 years of experience in network construction. Strong understanding and hands-on experience with L2/L3 data center networks. Demonstrated initiative to improve networks and expand technical skills. Familiarity with TCP/IP and troubleshooting based on it is preferred. Experience working with others to identify and resolve network issues is valued. Experience with IPSEC VPN and L4 (SLB) is a plus. Knowledge of traffic or log monitoring using open source tools is advantageous. Resume tips Describe two memorable cases where technical issues were resolved, such as optimizations or bug fixes. Highlight project contributions, specifying your role, the technology stack, and improvements made before and after your involvement. Hiring process Application submission Job interview Cultural fit interview Reference check Salary negotiation Final acceptance and onboarding

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.

About the Team You'll Join* As a Cloud Engineer (Cloud Platform Development) at Toss, you will be part of the Cloud Engineering Team, responsible for addressing and resolving issues within the Toss service infrastructure through a Cloud Native approach.* Joining this position means becoming a vital member of the Cloud Engineering Team.* Our goal is to optimize the infrastructure for Toss team members, ensuring a resilient system capable of handling large-scale traffic and preparing for potential failures.Your Responsibilities* Beyond utilizing cloud services, you will design, operate, and enhance them directly.* Analyze the infrastructure from a Cloud Engineer's perspective, providing solutions based on Kubernetes and OpenStack.* Implement features for performance optimization and operational automation of virtual infrastructure.* Develop monitoring, metering, and alerting systems to support the stability and efficiency of services at the virtual infrastructure level.* Adapt and improve open-source software for an in-house environment.* Build technical trust in cloud adoption and provide training and guidance to development and operations teams for seamless cloud utilization.We Want to Work With Someone Who* Is proficient in at least one programming language: Python, Golang, or C.* Understands REST APIs and database transactions.* Has knowledge and experience with OS, network, and storage technologies.* Is passionate about learning new technologies and actively applying them in operational environments.* Has a deep understanding of key OpenStack components such as Nova, Neutron, Cinder, Keystone, and experience in performance optimization.* Has experience in service operation and deployment using Kubernetes.A Note for Potential Colleagues"You will have the opportunity to experience cloud platform serving based on the latest trends of CI/CD and TDD."* Our team does not just 'write code.' We lead from problem recognition to infrastructure architecting, allowing you to experience the entire process of feature development, operation, and deployment automation. We constantly experiment with and apply new technologies, aiming for the highest level of operational automation and testing environments.* If you want to experience everything about cloud-native, discover a new career as an infrastructure developer, or are eager to learn more about infrastructure technology, we welcome you!

# Join Our Team- The Search Platform Team aims to create a fast and reliable search technology platform that everyone can use, providing technical support for search utilization across Toss.- We are building a robust Elasticsearch-based search infrastructure and common platform that allows various search systems, including commerce shopping search, advertising search, and integrated app search, to be rapidly experimented with and reliably operated.- The platform we develop is not just a basic search engine operation tool but is designed with scalability and consistency so that more teams can easily leverage search technology in actual services.- We are connecting unstructured elements like keyword search, vector search, and AI ranking models into a single search platform and expanding towards broader issues together.

Join Our Dynamic TeamAs a Data Engineer at Toss, you will be part of the Data Platform team.The Data Platform team operates within the Data Division, supporting and managing the data and platforms necessary for all Toss services.Our team comprises members with 2 to 18 years of experience from diverse backgrounds, including portals, banking, gaming, and startups.We encourage team members to pursue various interests and collaborate freely on skills and knowledge sharing.Your ResponsibilitiesDevelop and maintain stable and efficient data pipelines (ingestion, loading, streaming).Contribute to data-driven Toss services through real-time distributed processing of large datasets.Create and manage tools to ensure a reliable and efficient data experimentation and analysis environment for your colleagues.Develop various data service applications for data analysis and platform operation.Who You AreYou have experience in developing data pipelines for large-scale data processing (collection, processing, analysis).You are familiar with large-scale distributed systems (Hadoop, HBase, Kafka, Spark, Flink, etc.).You possess software development skills for data application development (Java, Scala, Python, etc.).You have intermediate or advanced programming skills (web/client/server programming).Experience in developing services related to recommendations/advertising/machine learning is a plus.Please Highlight These Experiences in Your ResumeDetail the projects you worked on, the technologies you used, and how you solved challenges, rather than just listing languages or frameworks.Experience using platforms similar to Toss is beneficial, but we prioritize growth potential and problem-solving abilities over specific technologies.Include any experience resolving critical failures while operating platforms or optimizing for performance and resource usage.Share experiences where you identified and resolved bugs in open-source software or contributed enhancements.Your Journey to Joining TossApplication submission > Technical interview > Cultural fit interview > Reference check > Compensation discussion > Final offer

Join our dynamic team at Toss Payments as a TCP Server Developer. We are looking for a skilled developer who is passionate about building high-performance server applications. You will be working with cutting-edge technologies to ensure seamless communication across our platforms.

Join Our Team! As a Site Reliability Engineer in the Tech Platform Tribe, you will work as a Server Developer. You'll build and operate effective monitoring systems to proactively detect and rapidly respond to issues. Your role will involve establishing performance testing environments to support service growth and addressing any challenges that arise, while designing solutions to prevent recurrence. Your Responsibilities: Continuously enhance the stability, scalability, availability, and latency of our systems. Improve monitoring systems to facilitate rapid root cause analysis in high-traffic environments. Resolve issues during outages and develop designs and solutions to prevent future occurrences. Establish and conduct performance testing environments to identify improvement points. Identify and improve single points of failure in network, application, open-source, and Kubernetes systems. Experiment with and evaluate various open-source products for potential implementation. We Are Looking For: Experience in Java/Kotlin and Spring Framework development, coupled with strong problem-solving skills. Ability to verify system availability through performance testing and resolve bottlenecks. Deep understanding of Linux and network systems. Experience operating infrastructure based on MSA, Kubernetes, Istio, Redis, Kafka, and ELK. A proactive approach to operating mission-critical services with a strong sense of responsibility. A willingness to embrace change and quickly adapt to new technologies while seeking continuous growth. Resume Submission Tips: Highlight impactful experiences and learning points rather than just listing past roles. Share instances where you proactively identified and resolved issues to enhance service stability. Discuss experiences where you significantly improved operational systems or introduced innovations that enhanced productivity and efficiency. Provide examples of deep analytical work to identify and resolve root causes of issues. Consider how you have designed systems to emphasize efficiency in environments with high or fluctuating traffic.