Vasileios Karakasis
Senior Performance Engineer at NVIDIA
Lugano, Ticino, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolVasileios Karakasis is a Senior Performance Engineer based in Lugano, Switzerland with a decade of experience optimizing HPC systems and datacenter performance, currently working on NVIDIA’s Applied Systems Team. He has led software engineering teams at CSCS, where he scaled and automated deployment, regression testing and benchmarking for 2,000+ scientific users and was a lead developer of ReFrame, an influential HPC testing framework. His background blends deep research (PhD in High Performance Computing) with hands-on kernel and SIMD optimizations, sparse-matrix expertise, and practical observability work for Omniverse performance. An active open-source contributor, he has maintained ReFrame packaging in the spack ecosystem to help users build and manage versions reproducibly. Colleagues know him for turning intricate performance models into automated, production-grade workflows that accelerate scientific computing at scale.
10 years of coding experience
6 years of employment as a software developer
Doctor of Philosophy (Ph.D.) High Performance Computing, Doctor of Philosophy (Ph.D.) High Performance Computing at National Technical University of Athens
English, French, German, Greek, Italian
Github Skills (4)
scientific-computing10
python10
package-management10
build-tools9
Programming languages (9)
Github contributions (5)
spack/spack
Mar 2021 - Dec 2022
A flexible package manager that supports multiple versions, configurations, platforms, and compilers.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 reviews, 15 commits, 16 PRs in 1 year 9 months
Contributions summary:Vasileios primarily contributed to the `ReFrame` package within the `spack/spack` repository. Their commits focused on adding new versions of `ReFrame` and modifying its recipe file, specifically `package.py`, to incorporate dependencies and configurations for these versions. This involved updating the versioning, sha256 checksums, and dependencies of the package to support the latest releases of the software. These updates allow users of `spack` to build and manage different versions of `ReFrame`.
compilerspythonradiussplatformslinux
vkarak/production
Mar 2018 - Sep 2021
General interest repository for CSCS users
Contributions:54 pushes, 78 branches in 3 years 6 months
interest
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