Senior Staff Software Engineer, Marketplace

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. Role Overview The Marketplace Growth Engineering team is dedicated to the success of third-party sellers on our platform. Our mission is to build the end-to-end, scalable, and intelligent systems that empower sellers to thrive. We create the tools, services, and data platforms that form the backbone of the seller experience, from intuitive user interfaces to high-performance backend processing. The ideal candidate is a backend engineering expert with extensive experience in building scalable data systems, excellent problem-solving skills, and the ability to own and drive impactful projects from inception to delivery. What You Will Do Design, develop, and automate large-scale, high-performance streaming data processing systems to drive business growth and enhance product experiences Build scalable data infrastructure and pipelines using best-in-class software engineering practices Develop optimal data models for storage and retrieval, meeting critical product and business requirements Take full ownership of projects, ensuring high-quality development and operational health Establish and execute short- and long-term architectural roadmaps to meet evolving business needs Drive continuous improvements in data platform efficiency, flexibility, and scalability, while maintaining customer trust, performance, and availability Contribute to shared data engineering tools and standards to enhance productivity and quality across Growth Engineering and Coupang as a whole Functionally decompose complex problems into straightforward, maintainable solutions Provide technical leadership across teams, sharing expertise to increase overall productivity and drive technical excellence Basic Qualifications Bachelor's degree in computer science, Electrical Engineering, Math, or a closely related field 8 years of experience in backend software development Proficiency in Java and the Spring Framework Experience working in cloud environments, particularly AWS Demonstrated experience in building and maintaining highly available, distributed systems Preferred Qualifications 10 years experience with handling large data volumes in a distributed environment Proven success in taking a leading role in building and delivering complex software systems Experience working with internet-scale datasets Strong communication skills, with the ability to gather requirements and collaborate with users, technical teams, and senior management. Experience influencing software engineering best practices across teams Hands-on expertise with a wide range of technologies, spanning front-end interfaces to back-end systems A customer-first mindset, with the ability to work backward from customer needs to deliver innovative, simple solutions 5+ years of experience building data-related products with proficiency in Spark, Flink, Spring, and Java Strong expertise in open-source frameworks and technologies, including Spring, AWS, APIs, NoSQL, and Big Data technologies such as Kafka, Elastic search, Iceberg, and ClickHouse Exceptional coding skills, with a focus on data structures, algorithms, problem-solving, refactoring, performance optimization, and complexity analysis Experience designing, implementing, ... (truncated, view full listing at source)