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Achievements

Achievement: Pair Extraordinairex4Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLO

Achievements

Achievement: Pair Extraordinairex4Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLO

Highlights

  • Pro

Organizations

@cssu

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YheChen/README.md

Yanzhen Chen

Software Engineer @ Bree (YC S21) · Computer Science @ University of Toronto

I like building systems from first principles: databases, runtimes, networking, compilers, and developer tools. I also enjoy shipping software that people actually use.

What I’m building

  • ChenDB - relational database engine built from scratch, with B+ tree indexing, query optimization, transactions, and crash recovery.
  • NovaOS - browser-based systems lab spanning a C-like compiler, 32-bit VM, kernel, and deterministic time-travel debugger.
  • FPS - multiplayer FPS and custom C++23 engine exploring authoritative networking, client prediction, reconciliation, and lag compensation.
  • TorontoGuessr - Toronto Street View guessing game played thousands of times, built with Next.js, Supabase/Postgres, and Google Maps.

Experiences

  • 💻 Software Engineer @ Bree (YC S21)
  • 🛠️ Open-source contributor to MarkUs
  • 🎓 Computer Science @ University of Toronto
  • 🧑‍💻 President @ UofT Computer Science Student Union

Portfolio · LinkedIn · Resume

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  1. TorontoGuessr TorontoGuessr Public

    Toronto Street View guessing game with 3,800+ games played. Next.js, Supabase/Postgres, Google Maps on Vercel.

    TypeScript 2

  2. ChenDB ChenDB Public

    Relational database engine built from scratch in Python: slotted-page storage, disk-backed B+ trees, a cost-based optimizer, ARIES write-ahead recovery and MVCC. Differentially tested against SQLite.

    Python

  3. NovaOS NovaOS Public

    Browser-based OS lab: a C-like compiler, a 37-opcode 32-bit VM, a preemptive kernel with 7 schedulers and virtual memory, and a deterministic time-travel debugger. 22k lines of TypeScript, 414 tests.

    TypeScript

  4. FPS FPS Public

    Multiplayer FPS + custom C++23 engine: authoritative 60 Hz server, client prediction, lag compensation, WASM client

    C++

  5. MarkUsProject/Markus MarkUsProject/Markus Public

    Git repository of MarkUs

    Ruby 284 258

  6. krishh-p/train-in-a-snap krishh-p/train-in-a-snap Public

    🏆 Top 32/261 @ Hack the North 2025

    TypeScript 2