#microservices

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.

A Rust service that serves Indonesia's administrative regions — 38 provinces down to 83,768 villages, keyed by the official Ministry of Home Affairs codes — as four cascading lookups with search, so every address form in every project gets the same answer.

The digital signature platform of the City Government of South Tangerang: signers prove who they are, sign PDFs to PAdES B-LTA with certificates from the platform's own authorities, and anyone can verify the result — version 2, which I designed, built and operate.

A small Rust service between applications and S3-compatible storage: it hands out presigned links so browsers talk to storage directly, gives each file a lifecycle, copies between buckets on the server, and keeps storage credentials out of every application.

Logs, traces and metrics from a dozen containers pushed over OTLP into one deliberately dumb collector, then read in Kibana — with a disk queue so a restart loses nothing, audit events counted exactly once, and the rule that telemetry must never become a failure point.