Backend engineer (Node.js / TypeScript) with 10 years of shipping software end to end, mostly working directly with overseas clients.
For the last three years I built and operated a Solana trading automation system in TypeScript and Redis. It consumed real-time WebSocket data, kept position state in Redis with per-token locks, and sent live transactions through Raydium and Pump.fun using a transaction submission layer I wrote myself (Jito bundles, priority fees).
Recently I audited that system. I replaced fixed-delay balance polling with signature-based transaction confirmation that separates confirmed, failed, expired and unknown outcomes, and I'm fixing the state-tracking issues the audit found.
Before that:
• 30+ iOS, Android and Unity projects delivered for freelance clients
• Vue.js at SotaTek and PHP at Koei Tecmo Software Vietnam, both for Japanese-market products
• Two iOS apps shipped solo to the App Store: MemoryInk Journal and Coreline Defense
How I work: clear written communication, comfortable with async teams, and careful review of AI-assisted code before it ships.
Looking for: remote backend or integration roles - Node.js, TypeScript, blockchain / wallet / payments integrations. Also open to hybrid in Hanoi. GMT+7.
Tech: Node.js · TypeScript · JavaScript · Redis · WebSocket · REST APIs · Solana web3.js · SPL Token · Python · Swift · C# / Unity · Vue.js · PHP
Duy Cao Nguyễn
@duycaonguyen
Backend Engineer | Node.js · TypeScript · Redis | Blockchain & Solana integrations | 10 years shipping software for overseas clients | Open to remote
VietnamExperience
Work history, roles, and key accomplishments
Independent Software Developer
Self Employed
Mar 2026 - Present (7 months)
Building and shipping own software products solo, including two iOS applications released to the App Store.
Backend & Blockchain Developer
Self Employed
Feb 2023 - Feb 2026 (3 years)
Delivered Solana trading automation and wallet-management tooling for individual clients, integrating with DEX platforms and on-chain data sources. Worked directly with clients on requirements and production support for systems executing real transactions.
Frontend Developer
SotaTek
Sep 2017 - Sep 2018 (1 year)
Built Vue.js interfaces for a recruitment platform serving the Japanese market, working to an overseas client's specifications and review process.
PHP Developer
Koei Tecmo Software Vietnam
Aug 2016 - Sep 2017 (1 year 1 month)
Developed and extended features for a Three Kingdoms browser game using PHP, at a Japanese game studio.
Education
Degrees, certifications, and relevant coursework
Hanoi University of Science and Technology
B.E., Electronics and Telecommunications
2011 - 2016
B.E. in Electronics and Telecommunications from Hanoi University of Science and Technology, completed in 2016.
Tech stack
Software and tools used professionally
Availability
Location
VietnamAuthorized to work in
Portfolio
linkedin.com/in/duy-cao-nguyenSalary expectations
Social media
Job categories
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