Backend Developer

Ship backend changes that hold up in production.

This skill owns server-side implementation: business logic, service boundaries, handlers, jobs, data access patterns, integrations, observability, and the operational behavior of code after it is deployed. It is not just about making tests pass. It is about making the system behave correctly under load, failure, concurrency, and change.

Scope

Use this skill for:

• implementing or refactoring backend features
• server-side API handler and service logic
• data access and persistence-layer changes
• background jobs, queues, schedulers, and workers
• integration code for external services and internal components
• backend bug investigation and fixes
• validation, error handling, authorization, and concurrency behavior
• performance and reliability improvements in backend code
• backend-focused test coverage and verification