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 →ReactStale Closures in React: The Real Problem (and Real Fixes)February 4, 2026JavaScriptClosures Are Easy — Scope Chains Are NotFebruary 4, 2026GitGit Is a Content-Addressable Database (Not a Version Control Tool)February 4, 2026GitUnderstanding Git's Directed Acyclic GraphFebruary 3, 2026TutorialUsing git commit fixup to simplifying commit squashingFebruary 3, 2026
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@ TheHumanInc
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