Case studies
Things I built end to end, mostly AI features that had to survive real users and real data. Each one covers the problem, what I shipped, and the decisions I'd make again.
CatatAja
A personal finance assistant on WhatsApp. Type, snap a receipt or send a voice note; an LLM understands it and a deterministic ledger records it.
Inbox assistant: every request on one board
A read-only AI assistant that collects work requests from my chat apps, proposes tickets for my tracker, and drafts my standups. I approve everything.
Outbreak investigation platform
A full-stack platform for field investigations: questionnaires with conditional logic, anonymous public submissions with location, and per-organization quotas.
NutriPlate
An AI nutrition tracker: photograph a meal, get a nutrition estimate, and follow calories and weight in an installable web app.
From 3 hours to 3 minutes: a lab report grading agent
Two AI agents that turn weekly lab report grading into a short review: one writes the grading guide, one grades against it, and I make the final call.
RT 06 Citran community portal
A heritage and news portal for a Kotagede neighborhood, with a CMS that lets non-technical admins edit text directly on the live page.
Most of my professional work is under NDA, so it doesn't appear here. These are my own projects, where I can show the whole thing.