Sr. Staff Back-end Engineer (Coupang Pay)
Core
Architecting and building mission-critical, distributed payment systems serving millions of users across Coupang's e-commerce and delivery platforms.
Role type
Sr. Staff Back-end Engineer (Fintech/Payments)
Builds
Cloud-native payment microservices, event-driven pipelines, real-time APIs, and AI-integrated payment workflows.
Domain
Fintech / Distributed Systems / E-commerce
Deliverable
production ML models | product features | infrastructure
Required skills
Distributed systems architecture, microservices design, event-driven systems, real-time data processing, concurrency management, system design, algorithmic fundamentals, cloud-native development, AI/ML integration, code optimization, observability, CI/CD, security practices.
Preferred skills
Payment systems experience at top global fintechs, GenAI/LLM workflow automation, Kubernetes/serverless deployment, multi-region scaling, open-source contributions in distributed systems.
Technologies
Java, Go, Python, JavaScript/TypeScript, Kubernetes, containerization, serverless, LLMs, RAG.
Responsibilities
Architect and implement complex distributed cloud-native systems spanning frontend, backend, APIs, and data pipelines; write and review production-grade code optimizing for performance and reliability; lead by example in code quality, observability, CI/CD, and security; deliver mission-critical features to millions of users with rapid iteration; optimize systems for concurrency, throughput, and cost efficiency under heavy global loads; participate in on-call rotation and drive continuous improvements in reliability; own large-scale payment microservices and real-time APIs; guide teams across web/mobile frontends and backend services; spearhead adoption of best practices in distributed computing and fault tolerance; drive adoption of AI/ML technologies into payment workflows; mentor senior engineers and peers; collaborate cross-functionally to shape technical vision and product strategy.
Seniority
Sr. Staff, hands-on IC with significant mentorship and architectural leadership.