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Work archive
Production systems, internal tools, and the testing that keeps them useful after launch.
Selected work on the homepage
A WhatsApp agent that handles the first layer of product questions for a laboratory instrument distributor. It verifies context, answers from the available product information, and hands the conversation to a human when a client asks for a quotation.
Guardrails enforce identity checks and mandatory human escalation before quotation follow-up or other outbound replies.
A multi-platform internal application for quotation and invoice creation, leads management, inventory, and the AI Customer Service dashboard. Role-based access keeps web, desktop, and mobile workflows aligned.
The Flutter client uses self-hosted distribution and version checks, with CI/CD plus automated exchange-rate ingestion through Supabase Edge Functions and pg_cron.
A multi-tenant platform where hosts collect guest-perspective event photos. Guests join through a QR code and receive an upload slot without creating an account.
In development with media storage and delivery across Supabase and Cloudflare R2.
A mobile-first learning app for Indonesians aged 40+: five guided levels, an AI image detector, a forward checker and a prompt translator. Directed and shipped with AI under a hard deadline.
A small system for recurring bills, subscriptions and Spotify Family cost splitting, running behind nginx on my own VPS.
End-to-end testing across tracking, reporting, and dashboard releases. I found substring matching that inflated brand mentions, flagged context loss in regex sentiment classification, and profiled API degradation under concurrent load.
masasijar