Senior Staff, Back-end Engineer (Gateway Services)

Korean text will follow English Company Introduction We exist to wow our customers. We know we’re doing the right thing when we hear our customers say, “How did I ever live without Coupang?” Born out of an obsession to make shopping, eating, and living easier than ever, we are collectively disrupting the multi-billion-dollar commerce industry from the ground up and establishing an unparalleled reputation for being leading 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 The Gateway Services team is responsible for building Coupang’s infrastructure layer based on a distributed microservices architecture, enabling reliable and efficient inter-service communication across the company. This infrastructure includes key capabilities such as service discovery, load balancing, traffic resiliency, traffic management, failure recovery, and observability. As a Staff Software Engineer, you will play a critical role in designing and evolving the platform architecture that powers Coupang’s services at scale. You will lead the development of Service Mesh and traffic control systems while providing technical leadership to drive high-quality and reliable delivery. You will also embody Coupang’s leadership principles by transforming complex challenges into simple, executable solutions and continuously improving the scalability and reliability of the platform. What You Will Do Design and implementation of traffic control and Service Mesh architecture in large-scale microservices environments Development and enhancement of core infrastructure components including service discovery, load balancing, and resiliency mechanisms Design of centralized policy and configuration management systems using a management plane Strengthening inter-service communication security through mTLS encryption and identity-based authentication and authorization Design and development of backend APIs using Java (Spring Boot) and infrastructure components using Go Simplification of complex infrastructure challenges into scalable and executable solutions Establishment of high-quality, highly available, and scalable platform architecture standards Root cause analysis and resolution of critical system issues, along with prevention mechanisms Collaboration with platform teams and technical leaders to improve service scalability and drive innovation Continuous improvement of engineering and operational excellence Basic Qualifications Bachelor’s degree or higher in Computer Science or a related technical field 8+ years of software development experience with at least 2+ years in a Technical Lead role Experience in designing and implementing traffic management solutions for large-scale systems Hands-on experience in designing and building large-scale distributed systems within the past 3 years Strong programming skills in one or more languages such as Java, Go, or Python Proven track record of delivering mission-critical systems Experience with cloud platforms such as AWS, Azure, or GCP Strong problem-solving skills with the ability to drive complex technical initiatives independently Excellent communication skills with the ability to collaborate and influence across teams Preferred Qualifications Hands-on experi