TCP Server Developer at Toss Payments | Seoul

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 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.

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 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.

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 Toss Income, a newly established subsidiary of the Toss community, focusing on innovative financial services related to income.Toss Income aims to enhance financial experiences by addressing challenges in the tax domain, which, while not a daily financial service, is a crucial aspect of financial life.We are dedicated to alleviating the difficulties individuals face in managing their taxes through services like 'Finding Hidden Refunds.'As part of the newest branch of Toss community, you will have the opportunity to be an initial member and shape our team.The team you will join comprises self-sufficient units known as silos, which include product owners, designers, developers, and data analysts, functioning like small startups.As our user base expands, we require server developers who can ensure stable operations while supporting various services at Toss.Your responsibilities will include:Designing and developing the servers for services utilized by Toss Income customers.Ensuring the stability of Toss Income services while swiftly addressing issues based on customer feedback.We are looking for individuals who:Have experience designing and operating high-availability, scalable systems.Possess a background in developing systems capable of handling large-scale real-time traffic.Have encountered and resolved system failures.Take pride in their work and approach it with a sense of ownership.Are eager to share insights and ideas gained from service development and continuously seek technical challenges.We recommend structuring your resume to highlight:Your experience in developing systems capable of handling high traffic quickly and reliably.Specific improvements you've made based on problems you've identified, detailing the technology stack used.Participation in the initial stages of service development.Experience in developing B2C services based on the Spring Framework.Technologies used at Toss Income include:Kotlin, Java, GradleNetty, Spring MVC, Spring Webflux, Spring Boot, Spring Cloud Gateway, Spring Cloud ConfigJPA/Hibernate, MySQL, MongoDB, Hadoop, Redis, Memcached, etc.

Join Toss Payments! Toss Payments strives to understand business challenges and inefficiencies, aiming to provide comprehensive solutions from technology to operations. We are committed to delivering an effortless and convenient service experience for consumers while ensuring a focused environment for merchants. We operate under the principles of autonomy and responsibility, with a strong culture of mutual trust, all aimed at innovating the electronic payment market. We are looking for colleagues who are eager to help shape the future of the payment industry! About Your Future Team The Legal Counsel position is part of the Legal & Compliance team at Toss Payments. This team guides the organization in navigating legal risks, ensuring that we safely reach our goals by identifying, mitigating, or circumventing these risks. Our team comprises members with diverse backgrounds from financial holding companies, securities firms, IT companies, and major law firms, fostering positive synergy. Rather than joining a fully formed team, you will have the opportunity to play a pivotal role in shaping the team from its early stages. We are looking for an individual to take on responsibilities following our recruitment in 2023. Your Responsibilities Review contractual structures related to transactions between financial institutions and merchants, such as banks and credit card companies. Support responses to various lawsuits, disputes, and complaints that may arise during business operations. Assess compliance risks related to electronic payment businesses, electronic financial operations, and new business initiatives, conducting legal reviews and monitoring compliance with laws and internal regulations. Respond to data requests and inquiries from regulatory bodies such as the Financial Supervisory Service, facilitating smooth communication with supervisory agencies and handling reporting obligations as required by relevant laws. Contribute to Toss Payments' growth by examining payment business models (PG, VAN) and collaborating with team members to ensure compliance with requirements. Provide legal advisory services for new businesses and the overall operation of services, understanding Toss Payments' business structure. Draft and review contracts necessary for various operations to support achieving business objectives. Who We’re Looking For A qualified candidate who has at least 3 years of experience as a corporate lawyer or in-house counsel. Experience reviewing fintech and financial regulations, such as the Electronic Financial Transactions Act, Specialized Credit Finance Business Act, and related laws. Background as in-house counsel at IT/fintech firms or experience in corporate legal advisory work at law firms specializing in financial companies. Experience dealing with regulatory agencies and engaging in public relations with authorities like the Financial Supervisory Service and Financial Services Commission is preferred. Desirable qualifications include expertise in IT, information processing systems, information security, or related academic backgrounds. Experience with new business evaluations, such as regulatory sandboxes or acquiring new licenses, is a plus.

Join Toss Payments as a Marketing Manager and play a pivotal role in shaping our marketing strategies. You will collaborate with cross-functional teams to design and implement comprehensive marketing campaigns aimed at expanding our market presence. Your creativity and analytical skills will drive innovative solutions that resonate with our target audience.

Join our innovative team at Toss Payments as a Data Engineer, where you'll play a crucial role in building and optimizing our data infrastructure. You will work with cutting-edge technologies, collaborating with cross-functional teams to drive data-driven insights and solutions. Your expertise will help us enhance our payment systems and improve user experiences.

# Introducing Toss Payments Toss Payments is dedicated to innovating the electronic payment market, providing merchants with comprehensive solutions from technology to operations, while offering consumers a seamless and user-friendly payment experience. Visit our introduction page: https://introducetosspayments.oopy.io/ # About the Team You'll Join The Account Manager role is part of the Key Account Growth Team within the Toss Payments Sales Tribe. This team is responsible for sales and partnerships related to Toss Payments' electronic payment services, focusing on existing clients, partners, and international payment companies. We aim to grow Toss Payments' business by introducing core payment products, discovering and expanding partnership channels, and enhancing integration of international payment products. # Your Role and Responsibilities Lead, manage, and take responsibility for the entire sales process, including introduction, negotiation, and onboarding of core payment products for existing clients. Engage directly with key decision-makers, from operational staff to executives, during the sales process, driving proposals and decision-making for payment product integration. # Who We Want to Join Us 5+ years of experience in cross-selling and upselling to large and small clients, preferably in a payment gateway (PG) company. Strong problem-definition skills to address various challenges that arise during the client sales process, coupled with flexible thinking to find solutions. Ability to comprehend and clearly explain complex products, policies, and processes. Proven persuasive communication skills, with a history of successful negotiations with clients and internal stakeholders. Experience in technology-based B2B sales is a plus, but not mandatory. # Application Tips Detail your experiences leading client sales and the quantifiable results achieved during that process. If you have experience creating proposals and negotiating with clients, please elaborate on those experiences. # Journey to Join Toss Payments Application submission > Job interview > Cultural fit interview > Reference check > Offer negotiation > Final acceptance and onboarding. A Message for Future Colleagues “Finding growth opportunities through sales and achieving significant success through negotiation and problem-solving is incredibly rewarding.” Having transitioned from a global company to Toss Payments, I now have the autonomy to define my sales deals and tackle challenges without waiting for approvals. If you're looking to find growth opportunities through sales and create significant successes through negotiation and problem-solving, apply for the Account Manager position now!

# Join Our Team- As a KYC Operations Assistant at Toss Payments, you will be part of the Anti-Money Laundering Team.- Our goal is to operate AML processes that reflect the Toss ethos: simple yet highly trusted. We continuously seek ways to enhance the effectiveness and reliability of our processes.# Responsibilities- Review documentation required for customer verification (KYC).- Identify parties that may exploit Toss Payments services for money laundering.- Devise strategies to enhance the effectiveness and reliability of the KYC processes.# We Are Looking For- Individuals with high concentration and perseverance.- Those aspiring to kickstart their careers as AML specialists.- Experience in KYC-related tasks, such as documentation review, is a plus.- Candidates who can commit to at least 6 months are preferred.# Resume Tips- Clearly state your motivation for applying to Toss Payments and the KYC Operations Assistant role.- If you have not handled AML tasks, provide detailed descriptions of your relevant work experience.- If you have experience in AML tasks, please elaborate on your specific responsibilities and achievements.# Important Information- Employment type is on a fixed-term contract basis for 6 months from the start date.- The contract may be extended upon mutual agreement.- Working hours are Monday to Friday, from 10 AM to 7 PM (including a 1-hour break).- Monthly salary is 2,400,000 KRW, which includes weekly allowances and meal expenses.- Employees who complete a contract of more than one month will receive a certificate of completion.# Join Us at Toss- Application Process: Document submission > Job interview > Final acceptance- Application Period: Ongoing recruitment (until positions are filled).

# Company Overview - The Toss Payments team aims to revolutionize the electronic payment market in South Korea. With the expansion of online and mobile commerce, Toss Payments seeks to provide innovative payment solutions that benefit both businesses and consumers through technological and business model advancements. # Key Responsibilities - Continuously enhance the Stability, Scalability, Availability, and Latency of our systems.- Build effective monitoring systems to proactively detect issues and respond swiftly.- Resolve incidents and design preventative solutions for future occurrences.- Establish and execute performance testing environments to support service growth.- Experiment with and evaluate the adoption of open-source products. # Qualifications - Expertise in Java-based technologies.- Solid understanding of software engineering principles.- Deep knowledge of Linux and network systems.- Comprehensive understanding of Microservices Architecture (MSA).- Enjoy working in mission-critical service environments with a strong sense of responsibility to build robust services.- Adapt quickly to new technologies and embrace change for continuous personal and professional growth. # Technologies at Toss Payments - Java Spring Framework, JPA/Hibernate, GradleJenkins, Git, Docker, Kubernetes + IstioKafka, Elastic, InfluxData, Grafana, MemcachedEJB, Pro C, AnyLink, Control M, Weblogic, Oracle # Journey to Join Toss Payments- Application Submission > Technical Interview > Cultural Fit Interview > Salary Negotiation > Final Acceptance and Onboarding # Industry Insights- The Future of the Payment Industry, Created Anew by Toss

# Join Our Team- As part of the Toss Payments team, you will navigate legal risks in the payment industry, providing guidance to ensure safe and secure achievement of our team's objectives by identifying and mitigating these risks.- You will address various legal matters related to corporate restructuring and other legal issues within the company, ensuring ongoing growth by reviewing and resolving necessary legal concerns.- In the innovative journey of Toss Payments, where we venture into uncharted territories and offer unique services, you will have the opportunity to engage in forward-thinking and groundbreaking legal reviews that are not typically encountered elsewhere.- We strive for a proactive legal team that collaborates from the outset with service organizations, allowing you to experience the growth and development of the company firsthand, unlike traditional risk management roles.- Our legal team comprises members with diverse backgrounds from financial holdings, securities firms, IT companies, law firms, and government bodies, fostering synergy through varied experiences. As Toss Payments is a relatively new organization, you can contribute to building the legal team from its inception rather than merely joining an established one.

About the Team You'll JoinThe Server Developer (SRE) is an integral part of the server platform team.Toss typically operates with small, feature-based silo teams comprising planners, designers, and developers. The server platform team is responsible for creating common functionalities and frameworks needed across these silo teams.This year, the server platform team aims to enable quicker and smoother launches of securities services while ensuring their stable operation, with plans to expand many more services in the future.Unlike silo teams, there are no separate planners in the server platform team. Engineers within the team take on the roles of both planners and developers, actively contemplating necessary features, gathering feedback, and determining the direction for development. Responsibilities You Will Have Establishing preventive measures and responding to incidents for stable services.Design and operate response processes to minimize service impact during incidents, ensuring rapid response.Analyze root causes (RCA) of incidents, enhance pre- and post-detection capabilities, and build systems to shorten recovery time and prevent recurrence. Ensuring service visibility and availability.Achieve visibility across infrastructure, networks, and Kubernetes environments, linking it to actual service metrics.Establish SLOs to clearly define problem situations, continuously enhancing the alert system with necessary metrics.Proactively identify potential bottlenecks in components in anticipation of traffic increases and improve structures. Conducting in-depth analysis of issues and identifying root causes.When service disruptions occur, analyze beyond logs, utilizing eBPF, memory, network, and kernel areas for comprehensive root cause analysis.Precisely analyze internal application behavior to provide optimal resource configuration guidelines to developers. Automating operations and developing internal tools.Automate repetitive analytical tasks and identify areas that hinder operational efficiency, developing tools for improvement.Automate testing environments to enhance service reliability and provide easy access for colleagues.

All applicants will have the opportunity to take a coding test!Experience unique to Toss Payments."Discover new possibilities alongside colleagues who help reduce trial and error."Create products with a lifespan of over 20 years that impact various merchants utilizing Toss Payments.Engage in complex tasks that involve understanding the history of previous technologies to identify improvement strategies.All engineers work towards a common goal, collaborating across teams on specific problems and organically removing blockers during the solution process.Embrace challenges and try anything to overcome your limits and discover new potentials.About Toss Payments:- Toss Payments aims to provide all necessary solutions for businesses, from technology to operations, understanding the challenges and inefficiencies they face. We create products that offer consumers a simple and convenient service experience while ensuring merchants can focus solely on their business.- We operate under the principles of autonomy and responsibility, fostering a strong culture of mutual trust as we pursue our core goal of 'innovating the electronic payment market.' We are looking for colleagues who will help shape the future of the payment industry!What you'll be working on:- Develop scalable and flexible systems to easily implement the continuously increasing payment requests and diverse requirements.- Create systems capable of handling traffic surges, such as those during flash sales, without crashing.- Build settlement systems that can quickly and accurately compute numerous transactions with hundreds of requirements.- Develop new APIs to address business difficulties in a microservices architecture that allows for seamless and uninterrupted deployments.- Establish an ecosystem to support OpenAPI, connecting Toss Payments with client systems.Who can apply:- Individuals with less than 3 years of practical development experience.- Those with no restrictions on overseas travel.- Candidates available to join by June 2024.Technologies used at Toss Payments:- Java, Kotlin, Gradle- Spring MVC, Spring Webflux, Spring Batch, JPA, Spring Cloud Gateway, Spring Cloud Config, Netty- MySQL, Redis, ElasticSearch, Kafka, OracleThe joining process at Toss Payments:- Application submission > Coding test > Job interview > Cultural fit interview > Reference check > Negotiation of terms > Final acceptance and onboarding.- Application submission: April 15 (Monday) to April 24 (Wednesday) by 23:59.- Coding test: April 27 (Saturday) at 14:00 (90 minutes total).- The test will consist of 60 minutes of algorithm questions and 30 minutes of descriptive questions.- Subsequent hiring process: Only those who pass the coding test will be notified of individual schedules.- Onboarding: To take place in June.Coding test details:- The coding test will be sent to the registered email on April 27 (Saturday) at 2 PM.- Time limit: 90 minutes.- Submission deadline for the coding test: April 27 (Saturday) at 3:30 PM.- All applicants will have the opportunity to take the coding test.Frequently Asked Questions:Q. Can I apply if I have a past rejection?- There are no restrictions on applying for the Toss Payments Server Developer position for those with less than 3 years of experience. Feel free to apply even if you have been previously rejected.Q. Can industrial function personnel or specialized research personnel apply?- Currently, Toss Payments does not permit the hiring of personnel under military service exceptions, thus they cannot apply.Q. Can foreigners or those living abroad apply?- If you have received a work visa or have no issues obtaining one, you are eligible to apply.

Join Toss Payments! At Toss Payments, we strive to understand the challenges and inefficiencies in business operations, aiming to provide comprehensive solutions that encompass technology and operational support. Our goal is to deliver a seamless and user-friendly service experience for consumers while ensuring our partners can focus solely on their core business activities. We operate under the principles of autonomy and responsibility, fostering a culture of mutual trust with the primary objective of innovating the electronic payment sector. We are looking for teammates who are eager to shape the future of the payment industry alongside us! About the Team You'll Join As a Server Developer at Toss Payments, you will tackle challenges within product-centric teams or specialized silos based on the complexity or scale of the issues at hand. Each silo comprises a minimum of 6-8 members, including a Product Owner, Product Designer, developers, and data analysts, allowing for independent decision-making akin to joining a small startup! The Team structure gathers developers with similar expertise to create function-driven products. Both structures collaborate with common platforms, DevOps, and SRE to continuously enhance work efficiency. PG Village Responsible for all aspects of payment operations and enhancements. Develop integrated payment systems, brand payments, payment widgets, and the technology to service them reliably. Design and develop contract systems, payment interfaces, backend systems, and settlement systems. Create Open APIs that allow our partner merchants to easily leverage these foundational systems, fostering a vibrant developer ecosystem. Your Responsibilities Your assignment to a specific Silo or Team will be adjusted based on your strengths and background during the interview process. As a Server Developer, you will: Design and develop a resilient payment system that supports Toss Payments' OpenAPI ecosystem, ensuring a smooth integration experience and meeting diverse business requirements. Continuously enhance the system to handle increasing payment traffic reliably while ensuring scalability and flexibility. Transition the overall payment system to a Cloud Native architecture, moving beyond simple lift-and-shift strategies to replatforming tailored to current business needs. Design and develop high-performance systems that can withstand surges in traffic without faltering, ensuring timely settlement processing even under peak loads. We Are Looking For Individuals who are passionate about innovation in the payment industry and eager to contribute to a collaborative environment. Those with a strong technical background and a commitment to delivering exceptional service.

Join our dynamic team at Toss Payments as an Inbound Sales Assistant! In this role, you will be the first point of contact for our customers, providing exceptional service and support. You will be responsible for assisting customers with their inquiries, guiding them through our services, and ensuring a seamless experience. If you are passionate about sales and customer service, we want to hear from you!

Join Our TeamAs a Product Server Developer at Toss, you will be one of the pioneering members of our team, gaining diverse experiences as we venture into the offline payment industry.We are excited to shape the history of payment systems, innovating the payment ecosystem with enthusiasm.You will collaborate with various colleagues, including Business Development Managers, Purchasing Managers, and Hardware Engineers, to successfully launch top-tier payment devices.Your ResponsibilitiesDesign and develop product servers that create digital innovations in the offline payment market, providing beautiful payment experiences.Handle all aspects of system service design and operations to ensure we deliver utmost value.Utilize cutting-edge technologies to maintain stable service operations, swiftly addressing user feedback and challenges.Ideal CandidateYou have experience designing and operating high-availability, scalable systems.You possess a background in developing systems that handle large-scale, real-time traffic.You have faced and resolved system failures, demonstrating your problem-solving skills.You approach your work with a strong sense of ownership and dedication, treating the service as 'your own'.You enjoy sharing insights and ideas gained from service development and are eager to embrace continuous technical challenges.Resume TipsDetail your experience in developing solutions that efficiently and reliably handle high traffic volumes.If you have proactively identified and improved issues, please specify the technologies used and the extent of improvements.Include any experience you have in participating in the early stages of service development.Experience in developing B2C services based on the Spring Framework is a plus.Technologies We UseKotlin, Java, GradleNetty, Spring MVC, Spring Webflux, Spring Boot, Spring Cloud Gateway, Spring Cloud ConfigJPA/Hibernate, MySQL, MongoDB, Hadoop, Redis, Memcached, ZookeeperKubernetes + Istio, Haproxy, NginxGoCD, ArgoCD, Consul, Vault, Git, Docker, Spinnaker, Jenkins, Ceph, HarborKafka, ELK, Prometheus + Thanos, InfluxData, Grafana

#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 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