Server Developer (Site Reliability Engineer) at Toss

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.

# 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 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.

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 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! 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 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 Our TeamThe Server Developer (Product) is an integral part of Toss's Maker Organization, Silo. Within each Silo, a diverse team of 6-8 professionals, including product owners, designers, developers, and data analysts, collaborates with autonomy, akin to a small startup.As our user base expands, our dedicated team of server developers ensures stable operations, supporting various services across Toss, distinct from the rapid experiments conducted within the Silo.What You'll Be DoingDesigning and developing the Product server, utilized daily by countless Toss customers.Offering over 50 diverse services since the launch of our easy remittance service in 2015, including financial status inquiries, pedometers, and luck quizzes.Implementing cutting-edge technologies to ensure service stability while promptly addressing user feedback and issues.Who We're Looking ForIndividuals with experience in designing and operating high-availability, scalable systems.Professionals with a background in developing systems that manage large-scale real-time traffic.People who have faced and resolved system outages effectively.Passionate individuals who treat the service as their own, embodying a sense of ownership.Collaborators eager to share insights and ideas gained from service development, constantly seeking technical challenges.Services You Will HandleLoan: Create services that allow users to easily compare various loans and manage them efficiently. We aim to be the go-to choice for credit loans, mortgage loans, refinancing loans, and card loans.Marketplace: Develop essential services, such as credit card benefit comparisons, investments, and auto insurance, for financial users.Payment: Work on Toss's simple payment service, TossPay, handling everything from online and offline payments to new payment method development and user acquisition promotions.Commerce: Enhance Toss's payment capabilities through commerce initiatives, launching group-buying and seller admin services to create value for both users and sellers.Benefits: Lead the creation of innovative services in the benefits tab, including pedometers, live shopping, lucky lotteries, and point rewards for friends.Ads: Expand Toss's advertising business, developing stable-serving products that handle large traffic volumes while integrating ad network developments.Home: Create services related to the home screen, the first touchpoint for all Toss users, analyzing assets and expenditures while connecting users to other relevant Toss services.

The Site Reliability Engineering (SRE) team at IMC Trading plays a pivotal role in ensuring the scalability and dependability of our trading systems. We are tasked with managing real-time systems, delivering rapid incident responses to maintain IMC's competitive edge in the market. Collaborating closely with traders and software developers, we define both immediate and long-term enhancements that streamline operations and enhance the scalability of our trading platforms. Our goal is to deepen our understanding of IMC's trading strategies and technical stack while leveraging automation to ensure efficiency and safety.Your Core Responsibilities:Maintain the continuity, stability, and reliability of the Korean trading production environment.Prioritize and resolve critical trading operations issues promptly, acting as the first line of response to triage and manage incidents under pressure.Proactively monitor trading systems, addressing potential issues before they escalate.Collaborate with technology and trading teams to continuously evolve and enhance system architecture.Lead and implement improvements to our systems, ensuring successful delivery by the SRE team, development teams, or trading teams.Transform quick fixes into sustainable solutions.Provide support and oversight on corporate infrastructure as needed.Coordinate with vendors for IT-related tasks and issue resolution.

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 our innovative team at Toss as a Server Developer (여신) where you will play a crucial role in designing and optimizing our server-side systems. We are looking for passionate developers who thrive in a fast-paced environment and are eager to tackle complex challenges. Your expertise will directly contribute to enhancing our platform's performance and scalability.

About the Domain You'll Join Toss is composed of several domains that operate as independent businesses, including Growth, Foundation, Commerce, Pay, Financial Marketplace, and Ads & Benefit. The Growth domain is designed to drive an increase in Toss app users and generate higher revenue per user. To propel Toss's growth, it is essential to not only attract new users but also encourage existing users to utilize more services within the app. You will be responsible for analyzing and improving existing services while also creating new services that contribute to user growth. Your Responsibilities Design and develop the product server utilized by numerous Toss customers. Establish valid hypotheses and validate them through experiments, utilizing data insights to progressively enhance product-market fit. Leverage trendy technologies to ensure stable service operation, while listening to user feedback to quickly and flexibly resolve issues. What You Should Note This position is aimed at individuals interested in creating new services that drive growth. While it shares similarities with the existing Server Developer (Product) role, it will specifically place you in the Growth domain. If you wish to have flexibility in your placement based on your strengths, consider applying for the [Server Developer (Product)](https://toss.im/career/job-detail?job_id=4071141003) position. Please note that Toss is not hiring individuals eligible for military service exceptions (industrial personnel, research personnel) at this time. Who We Are Looking For Individuals with experience in designing and operating high-availability scalable systems. Developers who have experience in creating systems that handle large-scale real-time traffic. Those who have encountered and resolved issues during system outages. Individuals who are passionate about their services and approach their work with a sense of ownership. Collaborative team players who are eager to share insights and ideas gained from service development, constantly seeking technical challenges. Technologies We Use at Toss Kotlin, Spring MySQL, MongoDB, Hadoop, Redis, Kafka, Elasticsearch The Journey to Join Toss Application submission > Functional interview > Cultural fit interview > Reference check > Offer negotiation > Final acceptance and onboarding A Note for Future Colleagues "Let's achieve explosive growth together in the Growth Domain!" The Growth domain is the ideal environment for those who love products and believe in the importance of analysis. You'll have plenty of opportunities to advance your career alongside outstanding makers. Creating value through deep analysis leads to daily dynamism and excitement in the Growth domain, with metrics like MAU and ARPU providing immediate feedback on your impact.

Join our dynamic Server Platform team at Toss, where we play a critical role in ensuring the stability and reliability of all Toss services. Our team is dedicated to building a solid foundation for our services to operate smoothly.As part of the Server Platform team, you will collaborate closely with Site Reliability Engineers focused on preventing outages, DevOps Engineers enhancing deployment pipelines, and Server Developers working on various products.We prepare meticulously to ensure rapid recovery from service disruptions, providing robust support for backend operations that allow service developers to respond effectively to users.To enhance the security and reliability of financial transactions, we implement features such as degraded functionality at the Gateway level, automate analysis, and strengthen runtime analysis capabilities.Our initiatives also focus on improving performance through various profiling methods and hardware acceleration, alongside architectural enhancements.To boost developer productivity, we offer common libraries for distributed locking, logging, and metrics.

About the Financial Marketplace Domain Toss organizes its work into several domains, each running its own business and product lines. The Financial Marketplace domain delivers a range of financial services, including loans, credit cards, insurance, and account management. This team helps customers address financial needs directly within the Toss platform. The domain is expanding into real estate and mobile services, aiming to address broader customer needs beyond traditional finance. Business and product teams work side by side, moving quickly to experiment with and scale new offerings alongside various partners. Learn more from the Financial Marketplace Leader Article. What You Will Do Design and operate products in the financial domain with a focus on scalability and stability. Work closely with partners to solve real problems, seeing the direct impact of your work and growing quickly. Move fast to achieve medium- and long-term goals for the domain, leading change where needed. Drive the adoption of AI Agent-based automation throughout the domain and help grow the platform. Who We’re Looking For At least one year of hands-on experience in software development. Background in designing and running high-availability, scalable systems. Experience building systems that handle large-scale, real-time traffic. Interest in, or experience with, AI-driven operational automation. Platform engineering design experience is a plus. Knowledge of financial products (such as loans, cards, or insurance) is helpful. Interest or experience in real-time data processing or Flink is beneficial. Experience setting up test infrastructure or mock servers is a plus. Understanding of regulatory or compliance requirements, or experience designing governance, is valued. Technologies in Use Kotlin Spring MySQL MongoDB Hadoop Redis Kafka Important Application Notes Candidates will be considered first for roles in the Financial Marketplace domain. Depending on interviews, skills, and internal needs, offers may be extended for other teams. If interested in roles outside this domain, see the Server Developer (Product) opening. Any false information on a resume or disciplinary issues during employment may result in cancellation of the hiring process. Hiring may be canceled according to Toss regulations if candidates fall under restricted or disqualifying categories. Hiring Process Application Submission Job Interview Cultural Fit Interview Reference Check Compensation Discussion Final Acceptance and Onboarding Working at Toss "To connect everyone with easier and more convenient finance." The Financial Marketplace Domain at Toss starts by questioning whether products truly serve users. Teams across business, product, and engineering work as one to build solutions. Perseverance and a collaborative approach to defining and solving problems, especially when navigating financial regulations, are valued here.

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

Join Our Dynamic Team!The Platform Server Developer will be an integral part of our server platform team.At Toss, we operate in agile, small groups comprised of planners, designers, and developers, working collaboratively to deliver exceptional services. The server platform team focuses on creating common functionalities and frameworks that support these agile teams.This year, our goal is to enable faster and easier launches of our securities services while ensuring stable operations. We are poised to expand our offerings significantly.Unlike other teams, our server platform team does not have dedicated planners. Our engineers take the lead, identifying necessary features, gathering input, and guiding development.Your Responsibilities Will Include:Consolidating and standardizing common challenges faced by developers and addressing these by adding new features.Utilizing Java/Kotlin and the Spring Framework as our primary server development environment, you will select and implement efficient practices from a variety of libraries and methodologies.Engaging in performance improvements using profiling tools, thoughtfully considering how to enhance performance, and translating those insights into actionable items.Evaluating and enhancing the overall architecture for deployability, operational efficiency, stability, and performance improvements.We Are Looking For Candidates Who:Are proficient in Java/Kotlin and the Spring Framework.Have experience with Redis, Kafka, or the ELK stack.Possess troubleshooting experience across layers such as Spring Framework, Tomcat, JVM, OS, networking, and infrastructure, including performance tuning.Have a background in real-time data processing and network programming.Are adaptable and eager to embrace new technologies to continually advance our services and infrastructure.Resume Tips:We prefer insights into your learning experiences rather than just a list of tasks. Particularly, we are interested in any service disruptions you faced, how you resolved them, and what you learned.Share any experience you have with platform work (common services, libraries) and whether you have independently identified and developed common functionalities.Detail your experiences with monitoring and alerts in server development and any challenges you encountered.Technologies We Use:Java, Kotlin, Golang, Spring Framework, NettyMySQL, Oracle, Redis, MongoDB, Kafka, Elasticsearch, GrafanaYour Journey with Toss Securities:Job interview > Cultural fit interview > References...

Join Our Team! At Toss, we are pioneering the offline payment industry and are passionately driving change within the payment ecosystem. The Platform Server Developer will be a key member of the platform team, focusing on developing server platforms that support all services, monitoring issues as part of SRE, enhancing deployment pipelines as DevOps, and collaborating closely with developers across different silos. You will work within a dedicated server platform team that ensures rapid recovery from service disruptions and maintains stable operations. Your Responsibilities: Develop common functionalities (such as Metric, Logging, Distributed Lock, Messaging) required by Server Developers at Toss using Java/Kotlin and Spring Framework. Create and manage platform services relevant to common interests (API Gateway, Monitoring & Alert System) used in Toss. Monitor server infrastructure at Toss, quickly detect issues, and work towards rapid recovery. Continuously improve the architecture from a holistic system perspective. We Are Looking For: Individuals with experience in providing server functionalities. Familiarity with technologies like Redis, Kafka, and ELK stack is a plus. Experience in designing and operating high-availability scalable systems. Experience in handling systems that manage large-scale real-time traffic. Proficiency in monitoring, troubleshooting, and performance tuning across various layers such as Spring Framework, JVM, OS, and Network. People who embrace change and want to continuously enhance services and infrastructure using appropriate technologies. Resume Recommendations: Please detail your experience related to platform-related tasks (common services, common library implementation and operation) and the reasons behind them. If you have designed and operated high-availability scalable systems, please explain your rationale and relevant experiences. For those with experience in designing and operating systems that manage large-scale real-time traffic, please include specific troubleshooting or performance improvement processes you encountered while operating services. Technologies Used at Toss: Kotlin, Java, Gradle Netty, Spring MVC, Spring Webflux, Spring Boot, Spring Cloud Gateway, and more.

Join Our Team! As a Server Developer (Platform) at Toss Bank, you will be an integral part of our Platform Team, ensuring the seamless operation of our banking services. We are dedicated to rapid recovery from unexpected service disruptions, preparing thoroughly to maintain stable and reliable operations. Our team consists of talented professionals from promising IT companies, all committed to ensuring the stability of our banking systems. We aim to enhance user experience by enabling our users to enjoy safe, fast, and reliable banking services through automated analysis and runtime enhancements. Your Responsibilities: You will develop and operate platform services used by Toss Bank (including high-volume message delivery, API gateways, APM, monitoring & alert systems, ELK, HAProxy, etc.). Provide common functionalities (Metric, Logging, Message Queue, Distributed Lock, Memory Cache, etc.) as platform libraries for our services. Implement redundancy measures to ensure stable service operations. Respond to various failures, analyze incidents, and work to prevent future occurrences. Collaborate with the infrastructure team during large data center operations to ensure service continuity. Who We’re Looking For: Experience in designing and operating highly available, scalable systems is essential. Experience in developing systems that handle large-scale real-time traffic is required. Proficiency in development using the Spring Framework is necessary. A history of continuous efforts in performance optimization and operational automation. Quick thinking and problem-solving skills are a must. A willingness to embrace change and adapt quickly to new technologies for ongoing growth. Ability to foster growth among fellow developers through collaboration. Enjoyment of mission-critical service environments with a strong sense of responsibility. Please include the following in your resume: A minimum of one specific project you participated in, detailing your contributions and the process of overcoming challenging tasks. Share various problems encountered while operating systems and detail your personal attempts and results in resolving those issues. If you have similar experiences in developing systems that handle large-scale real-time traffic, please provide detailed examples. Share your growth aspirations as a developer and the efforts you are making toward that growth.

Join our dynamic Commerce domain where innovation thrives! Toss operates multiple domains, each focusing on self-sufficient businesses, including Commerce, Pay, Financial Marketplace, Ads & Benefit, Foundation, and Growth. Our Commerce domain is the fastest-growing segment within Toss. Having launched Toss Shopping and Toss Shopping Partners, along with shopping ad services, we are continuously creating new value for both users and sellers. Inside the Commerce domain, teams like Shopping Silo, Shopping Platform, Shopping Ad Silo, and Commerce Business work collaboratively like a startup. As we embark on this new journey in 2024, we aim to expand the functionalities of our Commerce platform and strengthen its foundational capabilities. Your responsibilities will include: Designing and developing the Product server used by countless Toss Commerce customers. Creating diverse services such as product search/recommendation, catalog management, PLP, PDP, order/delivery, and coupon/promotion features. Utilizing cutting-edge technology to ensure service stability while listening to user feedback and resolving issues swiftly and flexibly.

Join Our Dynamic Team! As a Server Developer at Toss Bank, you will collaborate in a squad with diverse professionals including Product Owners, Product Designers, Server/Frontend Developers, and Data Analysts to create exceptional banking services. We foster a unique development culture and autonomous environment, striving to deliver unparalleled services that transcend the limitations of traditional banking. Your contributions will ensure that our customers enjoy the best banking experience through Toss Bank's services. Your Responsibilities Revamp the existing complex monolithic banking system into a flexible and scalable Microservices Architecture (MSA). Engage in the development of new product launches and expand your expertise through collaborative development across various domains. Design and develop the core banking system innovatively, exploring new methodologies. We Are Looking For Proven experience in developing services using Java or Kotlin within the Spring Framework. Experience in designing databases with Oracle, MySQL, or similar technologies while planning and operating services. Familiarity with transaction and flow control methodologies. Demonstrated ability to proactively learn new technology stacks or improve existing systems. Experience in developing and operating in a core banking environment is a plus. Even without financial sector experience, candidates who have improved inefficient system structures are encouraged to apply. Please Note Any discrepancies found in submitted documents or disciplinary issues in work history may lead to the cancellation of employment. Applicants with disqualifying reasons according to Toss Bank's employment regulations may also face cancellation of employment. We provide preferential treatment for disabled individuals and veterans in accordance with relevant laws.