senior-engineer

Systematic codebase exploration — maps files, dependencies, state flow, and framework usage for a target area. Returns a structured dependency map with file:line references.

Documentation and best-practices researcher — looks up framework docs, current patterns, and correct APIs for a given problem. Uses context7, web search, and project doc skills. Returns verified recommendations with sources.

Implements approved rewrites in an isolated worktree. Writes framework-native code following the researched approach, runs tests, and presents a clean diff.

Deep architectural code review that reads all files in the target area, maps dependencies and state flow, checks framework compliance against current docs, and ranks structural issues by criticality. Use when code quality feels off, before major features, when patches keep accumulating, or when you suspect the architecture is fighting itself.

Researched rewrite that reads all related files, looks up framework documentation for the correct approach, evaluates up to 3 options with pros and cons, waits for approval, then implements in an isolated worktree. Use when a review found a REWRITE issue, when Claude has been patching around a structural problem, or when you know the approach is wrong but need to find the right one.