Wanchai Nupinit — High-Reliability Backend & Crypto Infrastructure.
6+ years owning Crypto Wallet infrastructure at Bitkub — millions of transactions, 99.5%+ uptime, zero critical incidents. Expert in Golang microservices, FIDO2/WebAuthn security, and Kubernetes (EKS). Rising Stars 2025 · Best Delivery Team 2024.
Bitkub Online Co., Ltd
Senior Software Engineer — Crypto Wallet Team
Bangkok, Thailand
Leading Crypto Wallet infrastructure at Thailand's #1 exchange — Golang microservices handling millions of transactions with 99.5%+ uptime. Delivered flow Crypto Deposit/Withdrawal, fraud detection systems, and cross-platform mobile wallet features serving 5M+ users.
PTT Digital Solutions Co., Ltd
Full Stack Developer
Bangkok, Thailand
Developed microservices for PTT station operations — real-time notifications, monitoring tools, and POS system integrations using Node.js, MongoDB, and ReactJS.
Technical Ecosystem
Deep expertise in distributed systems, security, and cloud-native architecture.
Languages
Go (Golang)
TypeScript
JavaScript
Python
SQL
Backend & APIs
Node.js
REST API
Microservices
RabbitMQ
Kafka
Frontend
ReactJS
Next.js
HTML/CSS
Databases
MySQL
MongoDB
Redis
Elasticsearch
High-Impact Projects
All Projectsarrow_forward
Passkey Crypto Withdrawal
Designed and implemented FIDO2/WebAuthn biometric authentication for crypto withdrawal, eliminating SMS OTP vulnerabilities and SIM-swap attacks.
- Designed credential registration flow, server-side verification, and device binding.
- Eliminated SMS OTP vulnerability — zero SIM-swap incidents post-launch.
- Coordinated with security team for threat modeling and pentest review.
Mule Account Detection
Automated fraud detection system to identify mule accounts used for money laundering using async scoring pipeline.
- Scoring pipeline using multiple signals: transaction patterns, account age, behavioral data.
- Async RabbitMQ architecture — zero latency impact on main withdrawal flow.
- Collaborated with compliance team to define rules and tune false-positive thresholds.
FaceCheck Verification
Integrated liveness detection into the crypto withdrawal verification flow to prevent account takeover fraud.
- Built API layer connecting Bitkub's backend to 3rd-party liveness check provider.
- Reduced account takeover fraud via biometric identity verification.
Etax System Redesign
Re-architected the Etax (electronic tax document) system from a monolithic EC2 process into a stateless Golang microservice.
- Before: monolithic process running 5–6 hrs/day on dedicated EC2 instance.
- After: reduced to 2–3 hrs/day (~50% improvement).
- Stopped idle EC2 instance → saved $300.08/month in infrastructure costs.
Get in Touch
Looking for a senior engineer to architect your next high-reliability system?