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143 followers · 39 following
  • Cactus Compute
  • London
  • 09:42 (UTC +01:00)

Achievements

Achievement: Starstruckx3Achievement: Pair Extraordinairex2Achievement: QuickdrawAchievement: YOLOAchievement: Pull Sharkx2Achievement: Arctic Code Vault Contributor

Achievements

Achievement: Starstruckx3Achievement: Pair Extraordinairex2Achievement: QuickdrawAchievement: YOLOAchievement: Pull Sharkx2Achievement: Arctic Code Vault Contributor

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HenryNdubuaku/README.md

Henry Ndubuaku

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I build AI/ML models & systems, from the fundamental maths to JAX/Torch on large-scale infra or low-level implementations on accelerators. Author of cactus, 2.5k stars, now backed by YCombinator & Oxford Seed Fund.

Core Expertise

Maths Computing AI/ML/RL Distributed Systems GPU

Main Tools

Python C++ PyTorch Jax CUDA Vulkan Neon Cloud

Career Progression

  • 2025-XX: Cactus (YC S25) - Founder & CTO (tiny inference engine for phones and wearables).
  • 2024-25: Deep Render - AI Research Engineer (realtime video models that run on phone GPU/NPU).
  • 2021-24: Wisdm - ML Software Engineer (distributed perception AI for Maxar Defence satelite views).
  • 2019-21: MSc + Open-source activities (JAX/NanoDl, Torch/SuperLazyAutograd, CUDARepo, etc.).
  • 2018-19: Google GADS Scholarship Programme with Andela (pre-MSc), around systems design.
  • 2017-18: National Youth service, posted to software engineering after bootcamp, mostly ARM.
  • 2011-16: Started uni at 15y, covered EECS, data structures, algorithms, maths, physics.

Fun Highlights

  • Wrote Math For ML (with codes).
  • Gave this lecture to a small ML group in Nigeria, on optimising large-scale ML in JAX.
  • Co-host this monthly dinner for AI researchers, engineers and founders in London.
  • Kevin Murphy (DeepMind Principal), Daniel Holtz (Mid Journey Founder), Steve Messina (IBM CTO) followed back on X.
  • After CUDARepo, Nvidia reached out, I did 7 technical rounds, got a verbal offer, back-and-forth over YOE/pay, then I got YC.
  • Did MSc at QMUL, just to work with Prof Matt Purver (Ex-Stanford Researcher on CALO), did my project/thesis with his team.
  • Did BEng under Prof Onyema Uzoamaka (Rumoured first Nigerian CS grad from MIT), he taught computing archs off-head!

Pinned Loading

  1. cactus-compute/cactus cactus-compute/cactus Public

    Cross-platform framework for deploying LLM/VLM/TTS models locally on smartphones.

    C++ 2.7k 155

  2. nanodl nanodl Public

    A Jax-based library for building transformers, includes implementations of GPT, Gemma, LlaMa, Mixtral, Whisper, SWin, ViT and more.

    Python 290 11

  3. cuda-tutorials cuda-tutorials Public

    CUDA tutorials for Maths & ML tutorials with examples, covers multi-gpus, fused attention, winograd convolution, reinforcement learning.

    Cuda 187 5

  4. super-lazy-autograd super-lazy-autograd Public

    Hand-derived memory-efficient super lazy PyTorch VJPs for training LLMs on laptop, all using one op (bundled scaled matmuls).

    Python 73 1

  5. pete pete Public

    Parameter-efficient transformer embeddings replace learned embeddings with hardware-aware polynomial expansions of token IDs.

    Python 6

  6. tango tango Public

    Decentralised ML engine, where tiny edge devices like smart watches, phones, VR headsets, game consoles etc., could contribute.

    Go 1 1