Case Studies
Deep dives into architecture decisions, technical challenges, and production-scale systems I've built across AI, IoT, healthcare, ERP, and enterprise domains.
AI WhatsApp Bot
Multi-tenant AI assistant with RAG
AI-powered WhatsApp chatbot with RAG retrieval, multi-tenant architecture, and real-time message pipeline built on Hono v4, Drizzle ORM, PostgreSQL pgvector, and OpenAI function calling.
Video Streaming Infra
RTSP-to-HLS infrastructure platform
Infrastructure platform for CCTV camera management with RTSP-to-HLS transcoding, recording storage on MinIO S3, and live preview via hls.js.
Family Graph App
Interactive family tree visualization
Interactive family tree application with React Flow graph visualization, TanStack Query data fetching, and Prisma ORM featuring multi-table relational schema.
Clinic Booking Platform
Healthcare appointments + payment gateway
Clinic management platform with doctor scheduling, self-screening, payment gateway integration (Midtrans + Xendit), and real-time chat via Stream Chat.
34-Module ERP
Enterprise resource planning with commerce integration
Massive ERP platform with 34 modular packages including Accounting, POS, Commerce, CRM, Payroll, and omnichannel integrations (TikTok Shop, Shopee, WooCommerce).
School HRIS
9-package school HR platform with RBAC
HRIS for Islamic schools with 9 modular package groups, GPS+QR attendance, performance appraisal, Quran reading progress tracking, and RBAC via Filament Shield.
Enterprise HRIS
130+ module HR with message bus
Enterprise-grade HRIS with 130+ modules, RabbitMQ service bus, MQTT pub-sub for real-time communication, MongoDB + PostgreSQL multi-database architecture, and geolocation capabilities.