API Contract Validator
Check that an API's implementation actually matches its published contract (OpenAPI/schema spec) -- field types, required-ness, and status codes -- not just that it 'works' for the happy path.
Data Model Auditor
Check a schema/data model for normalization issues, missing constraints, and the specific place invalid data will slip through if the database doesn't enforce it.
GraphQL Schema Reviewer
Review a GraphQL schema change for N+1 resolver risk, nullability correctness, and whether it's actually backward compatible with existing clients.
SQL Review
Review a hand-written query for correctness first -- does it actually compute what the author thinks -- then for the index/plan implications.
Schema Migration Reviewer
Check a database migration for backward compatibility during a rolling deploy, lock behavior on a large table, and whether it's actually reversible.