NestJS

Measuring route-adherence defects before changing production behavior

Moving customer reporting off the transactional database

The role-binding incident—and the separate deadlock found later

Trading a runtime join for a materialized column, then finding the 79% my own migration left behind

Correcting production data safely with reversible, auditable tooling

Designing a single computation path for a cross-service metric

Making a flaky end-to-end suite deterministic without hiding failures

Making container and dependency hardening a standing practice, not an audit response

Synchronizing a Cross-Service Data Edit Atomically

Changing where a new state is handled, instead of teaching eight read paths about it

Making asset-tree search faster across the API and interface