Senior Staff Backend Engineer
Core
Design and build scalable, reliable Tier-1 services for order planning, fulfilment optimization, inventory allocation, and network cost management to process every Coupang order in real time.
Role type
Senior Staff Backend Engineer (Fulfilment Optimization)
Builds
Business Engine, Planner Solver, Network Manager, FO Inventory, WMS Fulfilment, Online Simulation, and FO Workflows for Coupang's ecommerce platform.
Domain
E-commerce, Logistics, Supply Chain, Distributed Systems, Optimization (via careerplan.io/jobs/8067672-senior-staff-backend-engineer-at-coupang)
Deliverable
production ML models | product features
Required skills
Kotlin, Java, gRPC, Kafka, CPLEX, Redis, System Design, Concurrency, Event-driven architecture, Resilience engineering, Technical leadership
Preferred skills
Optimization systems (CPLEX, OR-Tools), Agentic AI tools, Spec-Driven Development
Responsibilities
Design and build scalable Tier-1 services; Own architecture across distributed systems; Write production code and set the bar for correctness; Lead design and code reviews; Drive reliability for mission-critical services; Mentor engineers and create durable technical mechanisms.
