Sr. Staff Back-end Engineer (New Fintech Product)

Responsibilities

• Architect, design, and implement complex, distributed, cloud-native systems spanning frontend, backend, APIs, data pipelines, and infrastructure.
• Write and review production-grade code while optimizing critical paths for performance, reliability, and correctness.
• Lead by example in code quality, observability, CI/CD, and security standards across the organization.
• 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.
• 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 the adoption of best practices in distributed computing, fault tolerance, and multi-region scaling.
• Drive the adoption of AI/ML technologies by building or integrating 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.
• 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 a related field.
• 12-15+ years of software engineering experience with proven success in large-scale distributed systems.
• Deep expertise in full-stack development using Java, Go, Python, JavaScript/TypeScript, or equivalent languages.
• 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.
• Master's or PhD in Computer Science or a related technical discipline.
• Payment systems experience at top global fintech companies.
• Hands-on experience building and deploying AI Agents, GenAI, RAG, workflow automation, or LLMs into production-scale systems.
• Deep knowledge of cloud-native architectures including Kubernetes, containerization, serverless, and multi-region scaling.
• Experience in resolving technical and structural issues that occur as an organization grows and systems become increasingly complex.
• Publications, patents, or open-source contributions in distributed systems, payments, or AI applications.
• Fluent English communication skills; proficiency in Korean is a plus.
• Recruitment Process and Others
• Recruitment Process
• Application Review - Phone Interview - Onsite (or Virtual Onsite) Interview - Offer
• The exact nature of the recruitment process may vary according to the specific job and may be changed due to scheduling or other circumstances.
• Interview schedules and the results will be informed to the applicant via the e-mail address submitted at the application stage.
• Details to Consider
• This job posting may be closed prior to the stated end date for application if all openings are filled.
• Coupang has the right to rescind an offer of employment if a candidate is found to have submitted false information as part of the application process.
• Those eligible for employment protection (recipients of veteran's benefits, the disabled, etc.) may receive preferential treatment for employment in accordance with applicable laws.
• We are proud to offer equal opportunities for all applicants.
• Hiring may be restricted in case the legal qualifications required for hiring and work performance is not met.
• This is a full-time regular position and includes 12 weeks of probation period; provided, however, the probationary period may be either skipped, shortened or extended if necess

Benefits

Additional Information

반드시 첨부된 ' 사내공모지원서 양식 '을 작성 후 제출하여 주시기 바랍니다. Please complete the attached Internal Transfer Request Form and submit. 반드시 쿠팡 이메일 계정으로 지원 해 주시기 바랍니다 . Please make sure to apply with your Coupang e-mail address . 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.

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