Coupang Pay Director, Back-End Engineering

Coupang is reimagining the shopping experience with the goal of wowing each customer from the instant they open the Coupang app to the moment an order is delivered to their door. Powered by an outstanding end-to-end e-commerce and logistics network and a fanatical culture of customer centricity, Coupang has broken tradeoffs around speed, selection, and price. Today, we provide exceedingly fast shipping speeds on millions of items including fresh groceries, delivered within hours nationwide, 365 days a year. We are doing this for millions of consumers in Korea. Korea is home to one of the largest and fastest growing e-commerce opportunities anywhere in the world.

We have been named as one of the ‘50 Smartest Companies in the World’ by MIT Technology Review, and as one of Forbes magazine’s ‘30 Global Game Changers.’ In 2020, we placed second on CNBC’s ‘Disruptor 50’ list.

Job Overview

Coupang Pay is transforming the digital payments experience at massive scale—powering millions of secure transactions every day across Coupang.com, Coupang Eats, and our ecosystem of merchants and partners. We are building fast, reliable, and innovative fintech solutions that serve both consumers and businesses across Korea and beyond.

We are seeking a Sr.Staff Software Engineer who is both a visionary technical leader and a hands-on builder. This role combines architectural ownership, full-stack development, and distributed systems expertise to deliver payment systems with industry-leading scale, resiliency, and speed.

Key Responsibilities

Hands-on Architecture & Development

• Architect, design, and implement complex, distributed, cloud-native systems spanning frontend, backend, APIs, data pipelines, and infrastructure.
• Write and review production-grade code; optimize critical paths for performance, reliability, and correctness.
• Lead by example in code quality, observability, CI/CD, and security.

Operate at Scale & Speed

• Deliver mission-critical features to millions of users with rapid iteration while maintaining high availability and data integrity.
• Optimize systems for concurrency, throughput, and cost efficiency under heavy global loads.
• Participate in on-call rotation and drive continuous improvements in reliability and incident prevention.

Full-Stack & Distributed Systems Leadership

• Own large-scale payment microservices, event-driven pipelines, caching systems, and real-time APIs.
• Guide teams across web/mobile frontends, middleware, and backend services to ensure cohesive and performant experiences.
• Spearhead adoption of best practices in distributed computing, fault tolerance, and multi-region scaling.

Innovation & Emerging Technology

• Drive adoption of AI/ML technologies—build or integrate AI agents and intelligent automations into payment workflows.
• Stay ah