Case study: how I made a multi-tenant financial projection platform prove its numbers, with hand-calculated golden cases, API e2e tests on real PostgreSQL, Playwright, and a shadow-mode cutover.

Case study: two production integrations for small businesses, an ERP-to-Monday.com stock sync and a booking-to-itinerary pipeline, built around one source of truth, idempotency and human approval.

Case study: my changes to a fork of an open-source job-application app, adding confirmed facts only, verified submissions, a human in the loop for CAPTCHAs, and test isolation.

Full-stack banking demo with Spring Boot, Angular, transactional transfers, and idempotency handling.

Portfolio-ready Python CLI for CSV validation, deterministic reports, logs, and rejected-record summaries.