What's up! Tien's here
Software engineer, blogger & freelancerI'm a software engineer creating useful tools and websites, constantly learning new technologies, solving problems, and sharing my journey on my blog.Latest Posts
All posts →FintechReconciliation as Eventual ConsistencySeptember 15, 2025FintechMoney Under Concurrency: Optimistic vs Pessimistic LockingAugust 15, 2025FintechThe Transactional Outbox Pattern: Solving the Dual-Write ProblemJuly 15, 2025FintechExactly-Once Processing and the Idempotency ProblemJune 15, 2025FintechVietQR: How Vietnamese Banking QR Codes Actually WorkMay 15, 2025SEOTechnical SEO for a Next.js Blog (App Router)April 15, 2025
Career
Feb 2025 – Present
Software Engineer@ Geniee International Group
Full-time · Hanoi Capital Region
- Working on Geniee SFA/CRM — an enterprise sales management platform recognised as a Leader in ITreview's SFA category for 11 consecutive terms.
- First time working on a large-scale product with a real, large end-user base — a different challenge than project-based work.
- Learning how to navigate a big codebase, balance feature delivery with stability, and think about impact at scale.
Jul 2024 – Jan 2025
Software Engineer@ Wealify
Full-time · Startup
- Worked on Wealify — a fintech startup focused on personal finance management.
- Learned a lot about the finance domain, especially Virtual Account (VA) features: provisioning, transaction routing, and reconciliation.
- Fast-paced startup environment — wore many hats and shipped quickly.
Feb 2022 – Jun 2024
Full Stack Engineer@ Tokyo Tech Lab Vietnam
Full-time · Hanoi Capital Region · On-site
- Grew a lot here — worked across many projects, both Japanese outsourcing and in-house products.
- Touched domains I never expected: medical, logistics, ed-tech, and HR — each one taught something different.
- Went from just writing features to owning modules end-to-end, from DB design to deployment.
- Biggest project: MeeTruck — a transport management system for a Japanese partner, handling fleet, routes, and logistics operations.
Apr 2021 – Sep 2021
Programming Intern@ National Cyber Security Center of Vietnam
Internship · On-site
- Cut short by the pandemic — didn't learn as much as hoped, but got a first glimpse into the industry and how security teams operate.
Computer Engineering Student@ Hanoi University of Science and Technology
Bachelor of Science in Computer Engineering.
- GPA 3.04 / 4.0
- Studied through the Covid-19 pandemic — learned resilience, self-discipline, and how to keep building when everything is uncertain.
Awards & Certificates
Awards
2nd Place — Hanoi City Mathematics Excellence Competition2018–2019
Hanoi Department of Education and Training
Certificates
Claude Code FundamentalsApr 2026
Anthropic
TOEIC 825Dec 2024
ETS
JLPT N4Feb 2024
Japan Foundation
Featured Projects

View Project
Tiếng Nhật 365
A personal Japanese-learning platform I built to study vocabulary, grammar, and kanji and improve my own Japanese every day.
Next.jsReactNestJSPostgreSQLAWS

View Project
Tiếng Anh 365
A personal English-learning platform I built to practice and improve my own English skills every day.
Next.jsReactNestJSPostgreSQLAWS

View Project
Vietnamese Banking QR Code Generator
For testing vietnamese QR code for banking
Nuxt