Senior Staff, Back-end Engineering, Fintech Engineering (Coupang Pay)

Responsibilities

• We are seeking a Sr. Staff Back-end 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.
• In this role, you will lead the technical roadmap and define FinTech Lending products from the ground up. Your system will directly power the financial health of millions of consumers and small business sellers across multiple Asian markets.
• 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 ahead of fintech innovation, evaluating and deploying new technologies to improve customer experience and system resilience.
• Leadership & Mentorship
• Mentor senior engineers and Sr.Staff-level peers, fostering a culture of innovation, technical rigor, and rapid delivery.
• Collaborate cross-functionally with product, design, and infrastructure leaders to shape both technical vision and product strategy.

Requirements

• Bachelor's degree in Computer Science, Software Engineering, or related field.
• 15+ years of software engineering experience, with proven success in large-scale distributed systems
• Deep expertise in full-stack development (Java, Go, Python, JavaScript/TypeScript, or equivalent) and core payment systems.
• Hands-on architecture and design experience with microservices, event-driven systems, APIs, and real-time

Benefits

Additional Information

Company Introduction We exist to wow our customers. We know we're doing the right thing when we hear our customers say, "How did we ever live without Coupang?" Born out of an obsession to make shopping, eating, and living easier than ever, we're collectively disrupting the multi-billion-dollar e-commerce industry from the ground up. We are one of the fastest-growing ecommerce companies that established an unparalleled reputation for being a dominant 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 entrepreneurial 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. Job Overview Coupang Pay, a fintech subsidiary of Coupang Corp, provides payment gateway services for our growing and diverse business and customers. We focus on providing innovative payment and financial service solutions to all people and businesses that use Coupang's platforms, ranging from the customers who make a purchase on coupang.com and use Coupang Eats service, the merchants who sell on Coupang's open market platform, and the restaurants that use Coupang Eats delivery service. Coupang Pay strives to innovate all our customers' payment-related experiences with the team members who have the most diverse fintech experiences and have a good understanding of Coupang's business. Why Coupang Pay? Shape the future of digital payments in one of the world's fastest-growing e-commerce ecosystems. Own mission-critical systems serving millions of customers at global scale. Work in an inclusive, high-impact culture that values innovation, speed, and craftsmanship. Competitive compensation, equity, benefits, and continuous learning opportunities.

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