Portfolio

Production systems I've built and led — payments, hotel management, IoT monitoring, kiosks, and access control, with the results they delivered.

2026iot

Emergency Button Network

Scaled a single-site proof of concept to a supervised alert network of ~100 sites with heartbeat liveness, scoped escalation, and a full audit trail.

GoNext.jsMQTTPostgreSQLTelegram API

2026hospitality

Hotel Management System — Pekalongan

Helped organize revenue, bookings, guest records, housekeeping, staff salary, attendance tracking, and operational reporting into one system.

Next.js 16PostgreSQLDrizzle ORMWhatsApp APITailwind CSSREST API

2026web

Jastip Order & Payment Tracking System

Replaced chat-and-spreadsheet order tracking with a dashboard surfacing unpaid orders, missing addresses, and pending refunds at a glance.

Next.jsHonoTypeScriptDrizzle ORMSQLite

2026web

LLM Business Assistant

RAG-grounded KBLI assistant that cites official sources, demands verbatim-quote grounding, and answers honestly instead of guessing under load.

Next.js 16TypeScriptBunSQLiteOpenRouter APITailwind CSS

2026iot

Smart Lock Platform

One core platform runs both tiers: BLE-only for boarding houses, gateway-connected and tied to the booking lifecycle for hotels.

FlutterNode.jsPostgreSQLMQTTBLEREST API

2026iot

AI Video Analytics Platform

Built a per-camera platform turning CCTV streams into PPE compliance alerts, safety events, and vehicle analytics, with camera fleet health monitoring built in.

PythonRTSPONNX RuntimeByteTrackPostgreSQLREST API

2025iot

IoT Device Monitoring Platform

Helped freelance clients unify alerts and telemetry from 8+ device categories across multiple protocols into real-time dashboards built for their operations.

Node.jsMQTTModbusBLEPostgreSQLRedisWebSocketREST API

2025kiosk

Photo Booth Kiosk System

Built the booth session flow for QRIS payment, template selection, camera capture, GIF output, printing, and QR-based customer downloads.

FlutterPythonBun/ElysiaDrizzle ORMQRISCamera IntegrationTemplate Rendering

2025operations

Visitor Management System Integration

Connected visitor check-ins, appointments, facility access, and monitoring signals into one operational dashboard.

GoPostgreSQLREST APIWebSocketTailwind CSS

2022fintech

Cross-border Remittance Platform

Led the team to a licensed production system with end-to-end transfer tracking, audit trails, and operational dashboards for stuck or delayed transactions.

Node.jsPostgreSQLRedisDockerREST API

2022fintech

Multi-channel Payment Gateway

Led the team to unify multi-channel payments into one operational flow connected with the remittance platform.

Node.jsPostgreSQLRedisDockerREST API