Senior Staff Software Engineer, Marketplace

Coupang•Seattle, WA

About The Position

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.

Requirements

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

Nice To Haves

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, and maintaining distributed systems at scale, making trade-offs based on business demands
A self-starter mindset, with the ability to thrive in environments with evolving priorities and unclear requirements
Comfortable working in an agile, fast-paced environment

Responsibilities

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