Design and implementation of RESTful and gRPC services consumed by mobile and web clients
End-to-end service ownership: from requirements through deployment and production health
API contracts and versioning — ensuring consumers can depend on what you build
Data modelling and schema design across relational and caching layers Integration with third-party services (payment gateways, notification platforms, logistics providers)
Performance and reliability of the services you own: latency, error rates, and throughput under load
Code review participation and contribution to backend engineering standards