Senior Staff Software Engineer

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.

Responsibilities:

• 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.

Requirements:

• Minimum 12 years of experience working on software design and development in Java.
• Hands-on experience with designing, building, and deploying scalable, highly 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).

Preferred Qualifications:

• 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).