#TypeScript

The personnel information system of the City Government of South Tangerang: employees keep their own records and follow their services, administrators work on exactly their part of the organisation, and every rule comes from the regulation that sets it. Led and built by me since 2023.

The Vue browser application of a civil-service personnel system: a self-service portal where employees keep their records and propose changes, and administration of a versioned organisation chart, reference data and accounts — built from a few shared definitions, not a page per record.

Administrators of a city government's personnel system must each touch only their part of it: everything, one agency, or one unit. I made the scope data — a grant is user, role and scope — checked by one rule, requested and approved by different people, and expiring on its own.

Money crosses every layer of my systems: database, services, JSON, browser and printed documents. I keep one convention everywhere — amounts are integers in the currency's minor unit, as ISO 8583 carries them, named with a suffix, rounded in one place and converted only at the edges.

The Vue browser application of a document-signing platform: sessions held in memory and renewed by one queued refresh, PKCE sign-in, stamps placed precisely on PDF pages, identity checks with a face challenge, client consent, and role-based administration.

Each project began with its interface served from inside the borrowed Colab runtime, through Colab's own proxy — until Colab warned against it. Moving the interface out made the runtime a pure worker, and left two codebases held together by nothing but an agreement.

A laptop and a borrowed Colab GPU talked through a public MQTT broker that anyone could read. Giving that channel an identity took an afternoon on the broker and eight obstacles in the clients — mostly safeguards that were right for the old setup and wrong for the new one.

A Colab runtime has no address anyone can call, so a laptop and a borrowed GPU talk through a broker both of them dial out to. Sending commands was the easy half. Knowing — whether the worker is alive, whether a command arrived once — is where six silent failures hide.