Backend Developer
I build REST APIs and backend services with Go, NestJS, and PostgreSQL.
Implemented a web-based research system securing QR codes and embedded documents, built with Nuxt 4 and exposing 12 REST API endpoints for document issuance and verification.
Built a budget and goods management system for the kitchen operations of the SPPG MBG program with a Go, Fiber, GORM, and PostgreSQL backend, 35 REST API endpoints, and role-based access control.
Built the REST API backend for an archive system with JWT authentication, role-based access control, file search, archive request submission and tracking, and history management using Go, Echo, GORM, and PostgreSQL.
Focused on the Computer Networks, Security, and Digital Forensics (JKF) track, especially cryptography.
Cinema ticketing built as a distributed system: five-minute seat holds backed by Redis locks and a database unique constraint, asynchronous Xendit payments, event-driven ticket issuance, and refunds that follow the money instead of flipping a status flag.
Post-quantum authentication for a Go microservices task API: FN-DSA-512 JWT signing benchmarked with k6. Precomputation cut issuance latency 24.5%, but under stress both methods matched and cryptography stayed below 0.3% of total latency.
Journal article in ULTIMATICS (SINTA 3) and the proof of concept behind it: a hybrid ECDSA and ML-DSA signature scheme for transaction authentication on an Ethereum-compatible blockchain, with post-quantum signing handled off-chain by an oracle.
Web application securing QR codes and embedded documents with a digital signature and time-based encryption. Each scan verifies where the code originated and rejects it once its validity period has passed.
Hiring a Backend Developer? I'm open to full-time or contract, hybrid, remote, or onsite in Indonesia.