Simon Kallweit - Software Engineer at NVIDIA

Simon Kallweit

Software Engineer at NVIDIA

Herzogenbuchsee, Bern, Switzerland

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Summary

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Rockstar

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Top School

Simon Kallweit is a software engineer specializing in real-time graphics, light transport algorithms and digital signal processing, currently applying his expertise at NVIDIA. With an MSc in Visual Computing from ETH Zürich and hands-on internships at Disney Research Zürich and Walt Disney Animation Studios, he has contributed to production renderers like Hyperion and advanced research in CUDA-based volume rendering. He brings five years of professional experience combining high-performance rendering work with earlier embedded-systems and RTOS development, giving him a rare cross-domain fluency from low-level hardware to GPU-heavy graphics stacks. On GitHub he has acted as a software architect and backend contributor to prominent projects such as NVIDIA’s Falcor and the Slang shader toolchain, improving cross-API support and core rendering features. Colleagues rely on him for refactoring tricky parameter systems and fixing subtle shader and compilation issues that surface only in complex pipelines. He’s based in Herzogenbuchsee, Switzerland, and tends to bridge research-grade algorithms with production-ready engineering.

5 years of coding experience

11 years of employment as a software developer

Bachelor’s Degree, Computer Science, Computational Science, 5.54, Bachelor’s Degree, Computer Science, Computational Science, 5.54 at ETH Zürich

German, English, French

Github Skills (9)

vulkan10

c-language10

direct3d10

cprogramming-language10

architectures10

shader10

architecture10

cuda9

hlsl8

Programming languages (4)

TypeScriptC++CMakePython

Github contributions (5)

NVIDIAGameWorks/Falcor

Aug 2020 - Oct 2022

Real-Time Rendering Framework

Role in this project:

Software Architect

Contributions:7 releases, 4 reviews, 21 commits in 2 years 2 months

Contributions summary:Simon made several key modifications and updates to the Falcor real-time rendering framework, including fixing nested dielectrics and addressing compilation issues. They implemented a refactoring of the parameter block functionality and incorporated the new span library. The user also fixed errors in the GBufferRaster.3d.slang shader, which demonstrates a focus on core rendering features and API.

rendering-3d-graphicsrendering-enginewebglreal-time-renderingdirectx

shader-slang/slang

Sep 2022 - Jan 2023

Making it easier to work with shaders

Role in this project:

Back-end Developer

Contributions:1 release, 20 reviews, 15 commits in 3 months

Contributions summary:Simon primarily contributes to the `slang` project by enhancing its D3D12 and Vulkan capabilities, evidenced by commits focused on features such as "wave-ops" and dispatchRays(). They implemented the `gfxGetAdapters` function, extending it to include DirectX11, CUDA, and Vulkan, and introduced supporting data structures. Additionally, the user updated the shader cache implementation and implemented device limits for multiple graphics APIs, improving the project's overall functionality and cross-platform support.

cudavulkanshadersd3d12hlsl

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