[Coupang Pay] Sr.Staff, Back-end Engineer (Fintech Payment)

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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 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. 

Qualifications 

• Bachelor’s degree in Computer Science, Software Engineering, or related field. 

• 12–15+ 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). 

• Hands-on architecture and design experience with microservices, event-driven systems, APIs, and real-time data processing. 

• Strong fundamentals in algorithms, data structures, concurrency, and system design. 

• Proven ability to deliver rapidly and reliably in fast-paced, high-growth environments. 

Preferred Qualifications 

• Master’s or PhD in Computer Science or related technical discipline. 

• Payment systems experience at top global fintech companies (e.g., Stripe, PayPal, Razorpay, JusPay, AliPay, Visa, Adyen, Square, Mastercard). 

• Hands-on experience building and deploying AI Agents (GenAI, RAG, workflow automation, LLMs) into production-scale systems. 

• Deep knowledge of distributed microservices, cloud-native architectures (Kubernetes, containerization, serverless), and multi-region scaling. 

• Experience in dealing with and resolving the issues that occur when an organization grows in size and the systems get complicated 

• Publications, patents, or open-source contributions in distributed systems, payments, or AI applications. 

• Fluent English (Korean a plus); strong communication skills with global stakeholders. 

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. 

Join us to build the core of next-generation fintech at scale.