Location: Kronshagen, DE (Kiel / Hamburg area)

Remote: Yes (working EU+US remotely since 2014)

Willing to relocate: No, but I travel for kickoffs and on-site work

Technologies:

  AI / ML - PyTorch, TensorFlow, custom C++ inference, RL, speech, computer vision
  Systems - C++ (NEON / AVX), Python, CUDA, kernel drivers (Win / Mac / Linux)
  Distributed - Ansible, Docker, PostgreSQL
  Real-time - DSP, vectorized audio, low-latency pipelines
  Hardware - PCB design (KiCad / Altium), firmware, FPGA, USB3

Résumé / CV: https://hajo.me/downloads/Krabbenhoeft%20Hajo%20CV.pdf

GitHub: https://github.com/fxtentacle

Email: hn (at) hajo (dot) me

Hi, I'm Hajo. 20+ years shipping production systems, 12+ as CTO. I'm a fractional CTO and I offer AI R&D, performance optimization, and due diligence as freelance consulting services. You might know me from:

ImageRights: sole architect, 10+ years in prod. Web crawling stack (5000+ concurrent tasks via Ansible), distributed C++ content-based image retrieval database scaling to billions of web images, all internal AI filters, plus workflow automation. Still running today.

Spatial Audio Designer: sole developer. 500+ channels real-time on 2013 hardware. NEON / AVX-vectorized DSP, plugins for VST / RTAS / AU / AAX, kernel drivers for virtual sound cards on Mac and Windows, ARM port for embedded and VR. Still in use by famous Hollywood studios.

And yesterday, I figured out how to make MSFS2024 run with multi-camera and instrument pop-outs in Proton 11. Understanding the root cause required tracing the full stack from inside the game, through vkd3d, Proton, the host Linux OS, down to the GPU driver.

Ideally, I'm looking for 5-10 days per month part-time projects. Plus I'd love to work on applied AI / robotics.