Văn Nghiêm

Backend Engineer with 4+ years of experience designing and delivering production-grade fintech infrastructure for major Vietnamese banks. Specializes in high-throughput payment systems (ISO-8583, POS networks, real-time transaction processing) using Python and Rust. Proven track record leading engineering teams, integrating core banking systems, and shipping complex distributed architectures with Kafka, MQTT, and microservices.

Active open-source contributor with published OSS projects in the Python/Rust ecosystem

Backend Developer & Team Lead at Atom Solution (2022-09 – Present)

• Led a 5-member engineering team across 4 flagship fintech products for BVBank and OCB, owning technical direction, architecture decisions, code reviews, and delivery timelines.
• DigiStore (BVBank): Architected a fintech platform managing 3,000+ POS devices with QR/card payment processing, ISO-8583 integration via Jpos, real-time device communication over MQTT (EMQX), and async transaction processing via Kafka and Celery.
• Merchant Platform (OCB): Engineered a large-scale payment gateway integrating OCB's core banking infrastructure via ISO-8583, supporting merchant transaction lifecycle and settlement management — built in Rust, Python, and Java.
• Card Payment System: Developed a merchant and POS management platform with ISO-8583 gateway on FastAPI + Kafka for high-throughput transaction processing and Celery for background task queuing.
• AIT-Protocol (Bittensor Blockchain): Built an AI-powered math-solving chatbot on a decentralized network using Python ML models, Move/Solidity smart contracts, Redis caching, and Grafana/Prometheus monitoring.
• Established CI/CD pipelines with GitHub Actions and containerized all services with Docker, standardizing deployment practices across projects.

Freelance Backend Developer - Remote at Freelance (2022-04 – 2022-09)

• Delivered backend APIs for multiple small-scale fintech projects using Python (Flask, Django)
• Shipped production-ready REST APIs with clean architecture and documentation for client handoff

Bachelor of Science in Computer Science – Industrial University of Ho Chi Minh City (2022-06)