Sebastian Von Alfthan
Development Manager, HPC Support at CSC - IT Center for Science
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolSebastian Von Alfthan is a seasoned HPC leader with 15 years of experience managing procurement, support and application development for large-scale compute and storage systems at CSC in Finland. He combines hands-on parallel-programming expertise—MPI, OpenMP and Fortran/C optimizations—with strategic roles in major procurements (DL2021) and project leadership for petascale simulations like Vlasiator. As Development Manager for HPC Support he blends user-facing training and support with backend system design, and has a strong track record of enabling codes to scale to 100k+ cores. His open-source teaching contributions include MPI exercises and solutions for CSC’s HPC summer school, demonstrating both deep technical knowledge and an aptitude for pedagogy. Based in Helsinki, he holds a doctorate in computational physics and is known for translating research-grade simulation needs into production HPC services.
15 years of coding experience
8 years of employment as a software developer
Doctor of Science in Technology, computational physics, Doctor of Science in Technology, computational physics at Teknillinen korkeakoulu-Tekniska högskolan
Swedish, Finnish, English, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (8)
c1710
data-structures10
fortran10
mpi10
hpc10
c1110
data-structure10
openmp8
Programming languages (4)
Github contributions (5)
csc-training/summerschool
May 2017 - Jul 2019
CSC Summer School in High-Performance Computing
Role in this project:
Backend Developer
Backend DeveloperContributions:53 commits, 38 pushes in 2 years 1 month
Contributions summary:Sebastian contributed to the development of MPI-based Fortran and C code for working with user-defined datatypes, specifically focusing on creating and manipulating custom data structures for inter-process communication. They implemented datatypes for structures and subarrays, along with associated send and receive operations, to optimize data transfer. Their work is part of exercises and solutions related to high-performance computing, showcasing their understanding of MPI and its advanced features for efficient data handling. They also contributed to the dynamic arrays exercises, which demonstrate their understanding of C and Fortran.
summer-schoolmpihigh-performance-computingfortranperformance
galfthan/vlasiator
Dec 2016 - Apr 2019
Vlasiator - ten letters you can count on
Contributions:1 PR, 72 pushes, 39 branches in 2 years 4 months
ten
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