👋 Hi! I'm Nguyen Tan Loi

Backend Engineer • Fintech Systems Specialist • Problem Solver

Golang | High-Scale Distributed Systems | Microservices

✨ About Me

I'm a passionate Backend Engineer with 5+ years of experience building high-performance fintech systems using Golang, PostgreSQL, and microservices architecture. I specialize in designing scalable backend services that achieve sub-100ms latency at 5,000+ RPS. I love tackling complex distributed systems challenges and building solutions that make a real impact! 🚀

🏆 Key Achievements

⚡

Lightning-Fast Loan Processing

Reduced loan approval time from multiple days to under 2 minutes through pipeline automation

🎯

High-Performance Rule Engine

Built rule-based engine processing 5,000+ TPS with p95 latency under 100ms

🛡️

Fraud Detection System

Reduced fraudulent transactions by 60% using configurable velocity-based fraud detection

🔄

Core Banking Migration

Executed migration for 5M+ accounts with 100% data integrity and <30min downtime

💫 What I Do Best

🏗️

System Architecture

Designing scalable microservices and event-driven systems that handle millions of transactions with high reliability and performance!

⚙️

Backend Development

Building robust APIs, real-time processing pipelines, and distributed systems using Golang and cloud-native technologies!

🔍

Problem Solving

Tackling complex challenges in distributed transactions, system consistency, fraud detection, and high-scale data processing!

💼 Professional Journey

🏦

Cake by VPBank - A Digital Bank

Backend Engineer • Apr 2024 – Aug 2025

  • Led core banking migration for 5M+ user accounts
  • Built Loan Origination System (LOS) reducing approval time from days to <2 minutes
  • Developed rule-based fraud detection engine processing 5,000+ RPS
📈

Anfin – Y Combinator

Backend Engineer → Team Lead • Jun 2023 – Feb 2024

  • Built real-time commodity price streaming platform serving 3,000+ concurrent users
  • Promoted to Team Lead after 6 months for technical leadership
  • Designed WebSocket-based event-driven architecture with sub-second latency
🏢

VNPT-IT

Backend Engineer • Jun 2020 – Jun 2023

  • Developed backend microservices for government digital transformation projects
  • Served millions of users with strict security and compliance requirements

🎯 Tech Stack & Expertise

💾 Database

PostgreSQL MySQL Redis

🏗️ Architecture

Microservices Event-Driven Systems System Design Distributed Systems

📡 Messaging & API

Apache Kafka Google Cloud Pub/Sub gRPC RESTful API WebSocket

☁️ Cloud & DevOps

Google Cloud Platform Kubernetes Docker

📊 Monitoring & Observability

Prometheus Grafana

💪 Core Strengths

System Thinking Problem Solving Logical Thinking Ownership Collaboration Clean Code Practices

🤝 Let's Connect!

I'm always excited to discuss backend architecture, distributed systems, fintech challenges, or potential collaboration opportunities. Feel free to reach out!

📍 Based in Ho Chi Minh City, Vietnam