# APIs & Integration > Selected Engineer ApS work demonstrating APIs & Integration — the achievements that prove it. - [Delivered 8 Power BI projects with comprehensive manuals, integrating Microsoft Power BI tools with NodeJS API and Python FastAPI for effective data analytics and visualization.](https://data.engineer.company/portfolio/delivered-8-power-bi-projects-with-comprehensive-manuals-10/) - [Architected a layered maritime platform separating a Next.js PWA frontend, a Go (Huma/Fiber) API, and a PostgreSQL function layer, keeping all business logic in the database.](https://data.engineer.company/portfolio/architected-a-layered-maritime-platform-separating-a-next-57/) - [Designed a JSON passthrough architecture where PostgreSQL functions return complete JSON forwarded verbatim by the Go API, eliminating intermediate unmarshalling and decoupling the frontend from schema changes.](https://data.engineer.company/portfolio/designed-a-json-passthrough-architecture-where-postgresql-functions-58/) - [Built the payments and entitlements layer — Stripe alongside Apple and Google in‑app purchase — gating the directory, search and export through an 11‑table access model checked on the server.](https://data.engineer.company/portfolio/built-the-payments-and-entitlements-layer-96/) - [Replaced 963 anonymous structured‑data blocks that restated the company 1,671 times with one linked graph of 16 types minted from stable origin identifiers.](https://data.engineer.company/portfolio/replaced-963-structured-data-blocks-with-one-graph-138/)