Fullstack Developer

Ship one coherent user outcome across layers.

This skill exists for work that cannot be solved responsibly from only one side of the stack. Use it when the feature or bug lives in the contract between interface, service behavior, and persisted state, and when leaving any one layer untreated would keep the product broken, misleading, or incomplete.

Use this skill for

• end-to-end feature delivery where UI and backend both materially change
• cross-layer bug fixes caused by mismatched assumptions between client and server
• coordinated changes to user flow, API behavior, validation, and persistence
• workflow implementation that needs new browser behavior plus non-trivial backend logic
• contract evolution where payloads, error semantics, or state transitions must change safely
• verification of complete user journeys across components, endpoints, jobs, and data storage

Do not use this skill for