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Design, develop, and scale end-to-end recommendation systems, including ranking, retrieval, relevance models, feature pipelines, and online serving. Mine large-scale customer data, build and train machine learning models, run experiments, and launch algorithms that improve discovery and business outcomes. Collaborate with global teams, own recommendation services, and mentor engineers.

The Staff Back-end Engineer will develop scalable systems and lead architectural design while collaborating cross-regionally to improve e-commerce solutions.

The Staff Back-end Engineer will design high-quality systems, drive robust product growth, and collaborate on scalable solutions while mentoring engineering teams.

Lead and deliver large, cross-organizational technical programs focused on shared platforms, infrastructure, and data. Define business and technical requirements from analysis, drive system design, improve data strategy and quality, manage stakeholders and budgets, and enable product feedback and ecosystem design while coordinating engineering teams to implement solutions.

The role involves leading the architecture and design of SAP S/4 HANA solutions across key business domains, defining end-to-end processes, and guiding integrations, ensuring the platform meets high enterprise standards.

Audit and enforce quality and customer experience standards across fulfillment center hubs. Perform root-cause analyses, drive cross-functional corrective actions, develop and monitor quality KPIs, lead troubleshooting, and report insights to senior stakeholders to improve operational performance during international expansion.

Build and operate Coupang's security infrastructure and IAM platforms. Design and implement backend APIs and scalable distributed systems, collaborate cross-team for platform adoption, ensure reliability and operational excellence, and mentor other engineers.

Lead logistics compliance oversight through on-site audits of fulfillment centers, hubs, and 3PLs; monitor regulatory changes; build compliance KPIs and dashboards; drive remediation and advise leadership to ensure regulatory and operational integrity.

Build and operate Coupang's security infrastructure, focusing on a dynamic authorization engine. Design and implement large-scale distributed systems, write backend APIs (Java/Go), collaborate across teams to drive platform adoption, ensure operational excellence, and lead technical projects.

Lead security initiatives across Coupang Play: design and implement secure software, integrate security into SDLC and CI/CD, develop security libraries and automation, conduct threat modeling, pen tests, vulnerability assessments, incident response and forensics, and mentor engineering teams on secure-by-design practices.