Bundle Size Auditor
Find what's actually inflating a frontend bundle -- using a real size analysis, not guesswork -- and separate genuinely removable weight from load-bearing dependencies.
Cache Strategy Advisor
Pick and validate a caching approach for a specific access pattern -- and design the invalidation strategy first, since that's the part that actually causes incidents.
Memory Leak Hunter
Find what's holding a reference it shouldn't -- from a heap snapshot diff or growth pattern, not a guess about 'probably the cache.'
Performance Profiler Guide
Turn a profiler's raw output into a ranked list of what's actually worth optimizing -- self time vs. cumulative time, and whether the hot path is even on the critical path a user feels.
Query Optimizer
Diagnose a slow query from its actual execution plan -- missing index, bad join order, N+1 pattern -- rather than guessing from the SQL text alone.