Here are the projects I have designed and engineered. I focus on functional stability, speed, and seamless integrations.
General Affairs & inventory management system across 3 companies (holding + 2 subsidiaries), built from scratch to production-ready. Includes proactive security audits discovering and fixing multi-tenant access control vulnerabilities. Full-stack ownership from database & auth setup to deployment, featuring backend hardening (JWT, Zod validation).
Account-based production mutation recording & audit system for Padudjayaputera Group (holding + subsidiaries). Implements a spreadsheet interface with a real-time formula engine (Excel-like), automatic running balance calculations (Debit, Credit, Balance), automated digital signature PDF exports, and multi-tenant data isolation at the PostgreSQL database level via Drizzle ORM.
Internal company HRD system (employee management, attendance, leave, payroll, documents). Conducted a major technical audit and gradual refactoring, including discovering and fixing critical bugs in employee payroll calculations. Refactoring reduced code complexity by 36% (9,546 → 6,091 lines) and redesigned the sidebar component from 748 to 384 lines.
Sales & distribution management system for company operations. Served as the formal penetration testing target for Web Attack Monitoring System (WAMS) research — covering ML-based attack detection and real attack simulations (SQL Injection, XSS, Brute Force, Path Traversal). Production system tested across 3 rounds of formal penetration testing.
WAMS (Web Attack Monitoring System)
Internal Architecture / Source CodeMachine learning-based web attack detection system (Random Forest multiclass) with LLM as automated security analyst, tested via real penetration testing against company production systems (Integrated Sales & Distribution Management System). Achieved an F1-score of 0.9965, 99.47% accuracy, 0.29% false positive rate, and automated IP blocking in under 1 minute.
SalonNext
Internal Architecture / Source CodeComprehensive salon management & POS system. Features a quota-based service package system tied to customer profiles (auto-decrements per visit with quota tracking & history), package payments via QRIS (Xendit integration) with instant activation, automated WhatsApp notifications (Fonnte integration) for customer follow-ups per service schedule, and automated/manual staff commission splitting for multi-staff services.
A tourism information website presenting destinations, place details, and a modern responsive interface.
An event website promoting Car Free Day activities in Pangandaran, in collaboration with KKN 126.