Senior Staff Backend Engineer

Coupang · Bengaluru · 12+ yrs experience · Posted 2026-07-18

Tech stack: Java, Kafka, Kotlin, MySQL, TypeScript, Backend

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About the role

Responsibilities:
- We're looking for a Senior Staff Engineer to lead the technical direction of MyCoupang, Coupang's post-purchase customer experience platform.
- Every order tracking, delivery, return, payment, and support interaction for tens of millions of active customers across Korea and Taiwan flows through this system.
- MyCoupang operates at significant scale: ~34,000 requests per second, ~2.4 billion requests daily, and ~16 billion weekly, served by 700+ production pods with a 9x daily traffic swing that must be absorbed seamlessly.
- The platform delivers P95 latency under 500ms, P99 under 1 second, and maintains a 0.002% error rate.
- Built on Kotlin (backend), TypeScript with server-side rendering and ReactJS (frontend), the system spans a dual-service architecture with 100+ page routes and 30+ business domains including Orders, Payments, Delivery, Cancel/ Return/Exchange, WOW Membership, Travel, and Contact Center.
- The team ships 100+ features monthly, supports multi-market business logic across KR and TW (each with region-specific compliance, internationalization, and payment methods), and enforces security through a 4-phase authorization pipeline.
- This is a complex, high-stakes environment where architectural decisions have immediate customer impact.
- In this role, you will own the most critical technical challenges on the platform: designing multi-market abstractions that scale to new regions, driving the system toward 99.99% availability, leading disaster recovery readiness and capacity planning across the full production fleet, and defining the long-term architecture for a platform that must reliably serve billions of requests weekly while continuing to evolve.
- You will directly influence customer retention and satisfaction metrics for every Coupang post-purchase interaction, set the engineering bar for the team, and shape the technical strategy for one of Coupang's most customer-facing systems.
Qualifications:
- Minimum 12 years of experience working on software design and development in Java.
- Hands-on experience with designing, building, and deploying scalable, high available systems
- Experience with high-throughput, low-latency systems handling millions of requests
- Experience with event-driven architectures using Kafka or similar messaging systems
- Strong problem-solving skills and ability to debug complex distributed systems
- Excellent collaboration skills to work with cross-functional teams (Product, CS, Logistics, Payment)
- Backend development (Java, Kotlin, or similar JVM languages preferred)
- RESTful API design and implementation
- Database design and optimization (MySQL,
- Aurora)Message queue systems
- (Kafka)Workflow engines (Activiti BPMN, Temporal)
- Monitoring and alerting (Grafana, CloudWatch)
- Version control
- (Git)CI/CD tools (CircleCI or similar
- Hybrid

Qualifications

- Minimum 12 years of experience working on software design and development in Java.
- Hands-on experience with designing, building, and deploying scalable, high available systems
- Experience with high-throughput, low-latency systems handling millions of requests
- Experience with event-driven architectures using Kafka or similar messaging systems
- Strong problem-solving skills and ability to debug complex distributed systems
- Excellent collaboration skills to work with cross-functional teams (Product, CS, Logistics, Payment)
- Backend development (Java, Kotlin, or similar JVM languages preferred)
- RESTful API design and implementation
- Database design and optimization (MySQL Aurora)Message queue systems
- (Kafka)Workflow engines (Activiti BPMN, Temporal)
- Monitoring and alerting (Grafana, CloudWatch)
- Version control (Git)CI/CD tools (CircleCI or similar Hybrid

Responsibilities

- We're looking for a Senior Staff Engineer to lead the technical direction of MyCoupang, Coupang's post-purchase customer experience platform.
- Every order tracking, delivery, return, payment, and support interaction for tens of millions of active customers across Korea and Taiwan flows through this system.
- MyCoupang operates at significant scale: ~34,000 requests per second, ~2.4 billion requests daily, and ~16 billion weekly, served by 700+ production pods with a 9x daily traffic swing that must be absorbed seamlessly.
- The platform delivers P95 latency under 500ms, P99 under 1 second, and maintains a 0.002% error rate.
- Built on Kotlin (backend), TypeScript with server-side rendering and ReactJS (frontend), the system spans a dual-service architecture with 100+ page routes and 30+ business domains including Orders, Payments, Delivery, Cancel/ Return/Exchange, WOW Membership
- Travel, and Contact Center.
- The team ships 100+ features monthly, supports multi-market business logic across KR and TW (each with region-specific compliance, internationalization, and payment methods), and enforces security through a 4-phase authorization pipeline.
- This is a complex, high-stakes environment where architectural decisions have immediate customer impact.
- In this role, you will own the most critical technical challenges on the platform: designing multi-market abstractions that scale to new regions
- driving the system toward 99.99% availability, leading disaster recovery readiness and capacity planning across the full production fleet, and defining the long-term architecture for a platform that must reliably serve billions of requests weekly while continuing to evolve.
- You will directly influence customer retention and satisfaction metrics for every Coupang post-purchase interaction, set the engineering bar for the team, and shape the technical strategy for one of Coupang's most customer-facing systems.

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