Senior Software Engineer - Backend (Finance Platform)

Company Introduction We exist to wow our customers. We know we’re doing the right thing when we hear our customers say, “How did we ever live without Coupang?” Born out of an obsession to make shopping, eating, and living easier than ever, we’re collectively disrupting the multi-billion-dollar e-commerce industry from the ground up. We are one of the fastest-growing e-commerce companies that established an unparalleled reputation for being a dominant and reliable force in South Korean commerce. We are proud to have the best of both worlds — a startup culture with the resources of a large global public company. This fuels us to continue our growth and launch new services at the speed we have been since our inception. We are all entrepreneurs surrounded by opportunities to drive new initiatives and innovations. At our core, we are bold and ambitious people that like to get our hands dirty and make a hands-on impact. At Coupang, you will see yourself, your colleagues, your team, and the company grow every day. Our mission to build the future of commerce is real. We push the boundaries of what’s possible to solve problems and break traditional tradeoffs. Join Coupang now to create an epic experience in this always-on, high-tech, and hyper-connected world. Role Overview: We are looking for a Senior Software Engineer to join Coupang’s Finance Platform team, building scalable backend systems that power core financial operations such as settlements and payouts. The team is building a common finance platform that supports end-to-end partner settlement systems and financial workflows used across the organization. These systems process tens of millions of events per day, requiring high scalability, reliability, and correctness. As a Senior Software Engineer, you will own key components within this platform, working on backend systems that integrate distributed data processing, real-time event handling, and cloud-native architectures. You will have the opportunity to : Build large-scale backend systems supporting settlement and payout platforms Work on distributed event-driven systems processing tens of millions of events daily Solve real-world financial system challenges involving scale, correctness, and reliability Contribute to a multi-year initiative to modernize finance platforms at Coupang Gain exposure to modern data and streaming technologies (Kafka, Spark, Flink) Key Responsibilities: Design and develop backend services for finance platform systems such as settlements and payouts Own and deliver medium-to-large features end-to-end, from design through deployment Build scalable and reliable systems using Java and cloud-native technologies Work with streaming and data processing systems (Kafka, Spark, Flink) to handle high-volume data flows Contribute to architectural decisions within your team’s scope and drive component-level ownership Break down well-defined problems, evaluate trade-offs, and implement efficient solutions Ensure high-quality code with strong focus on maintainability, performance, and scalability Participate in code reviews, design reviews, and actively reduce technical debt Collaborate with cross-functional stakeholders to understand business requirements and deliver impact Mentor junior engineers and contribute to team-level engineering excellence Qualifications: 4–6 years of backend software engineering experience Strong programming skills in Java (or similar backend language) Experience building REST APIs and distributed systems Solid understanding of system design fundamentals and design trade-offs Experience working with cloud platforms (AWS preferred) Strong problem-solving ability and ownership mindset Ability to independently deliver features with minimal guidance Preferred Qualifications Experience with streaming/data technologies such as Kafka, Spark, or Flink Exposure to financial systems, payments, or settlement platforms Experience working with large-scale, high-throughput systems Familiarity with d