Staff Backend Engineer
Core
Design and build scalable, reliable Tier-1 services for order planning, fulfilment optimization, inventory allocation, and network cost management in a real-time e-commerce environment.
Role type
Staff Backend Engineer (Fulfilment Optimization)
Builds
Business Engine, Planner Solver, Network Manager, FO Inventory, WMS Fulfilment, Online Simulation, and FO Workflows for Coupang's order flow in Korea and Taiwan.
Domain
E-commerce, Logistics, Supply Chain, Distributed Systems
Deliverable
production ML models | product features
Required skills
Kotlin, Java, System Design, gRPC, Kafka, CPLEX, Redis, Multi-region Architecture, Resilience Engineering, Technical Leadership
Preferred skills
E-commerce Fulfilment, Optimization Systems, Agentic AI Tools, Spec-Driven Development
Technologies
Kotlin, Java, Spring Boot, CPLEX, Kafka, Cassandra, Elasticsearch, Redis, gRPC, Temporal, Drools
Responsibilities
Design scalable Tier-1 services; Own architecture across distributed systems; Write production code; Lead design and code reviews; Drive reliability for mission-critical services; Partner with Product, Data Science, and Operations; Mentor engineers.
Seniority
Staff, hands-on IC with broad architecture influence
