Marius Hillenbrand
Quantum System Software Engineer at IBM
Mannheim, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolMarius Hillenbrand is a Quantum System Software Engineer with 11 years of deep systems and low-level software experience, currently working at IBM in Mannheim. He holds an M.Sc. in Computer Science from KIT and has a solid track record across IBM and AWS building kernel, hypervisor and Linux-on-z solutions. His contributions to high-profile open-source projects like GCC and OpenBLAS show expertise in compiler internals, s390x-specific optimizations, and assembly-level performance tuning. Marius blends research experience from a PhD track with hands-on production engineering, having implemented precise floating-point and vector intrinsic fixes as well as optimized SGEMM/DGEMM kernels. He is comfortable navigating both algorithmic performance trade-offs and platform-specific toolchain issues, often surfacing subtle correctness fixes that improve portability and performance. Colleagues rely on him for solving intricate low-level problems that bridge hardware capabilities and system software.
11 years of coding experience
16 years of employment as a software developer
Master of Science (M.Sc.), Computer Science, with distinction, Master of Science (M.Sc.), Computer Science, with distinction at Karlsruhe Institute of Technology (KIT)Abitur, Abitur at Albertus-Magnus-Gymnasium Ettlingen
English, German, French
Github Skills (17)
computer-architecture10
architecture10
internals10
blas10
vectorization10
c1110
c1710
performance-optimization10
lapack10
compiler10
architectures10
float329
gcc9
floating-point9
test-automation8
Programming languages (5)
Github contributions (5)
OpenMathLib/OpenBLAS
May 2020 - Nov 2021
OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:37 commits, 1 PR, 2 comments in 1 year 6 months
Contributions summary:Marius primarily contributed to optimizing the OpenBLAS library, focusing on s390x architecture. They implemented and improved SGEMM and DGEMM kernels using explicit loop unrolling, vectorization, and assembly-level optimizations. The user also addressed build issues related to compiler compatibility and incorporated dynamic architecture detection based on hardware capabilities to improve performance and maintainability. Furthermore, the user fixed a benchmark issue related to flipped indices.
lapackopenblaslapackelinear-algebrabsd
gcc-mirror/gcc
Jun 2021 - Jun 2021
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 commits in 1 day
Contributions summary:Marius contributed to the GCC compiler, focusing on IBM Z architecture-specific features. They implemented test cases for `float_t` and `FLT_EVAL_METHOD` on s390x, and configured excess precision for float at compile time to align with glibc changes. The user also addressed linking issues with libatomic and fixed error checking for built-in vector intrinsics, demonstrating expertise in compiler internals and low-level system programming. They further fixed vector intrinsic mappings.
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