Benjamin Ulmer
Senior Software Engineer at MongoDB
Calgary, Alberta, Canada
Summary
👤
Senior🎓
Top SchoolBenjamin Ulmer is a Senior Software Engineer based in Calgary with a decade of experience building high-performance C++ and GPU-accelerated systems. He has driven production-grade libraries and tooling—most recently as a senior engineer at MongoDB and previously as a core contributor and code owner on AMD’s ROCm/Tensile and rocBLAS projects where he optimized GEMM kernels and automated kernel generation and tuning. At BigGeo he designed BG-Core and prototyped BG-Search, a geospatial index that outperformed competitors by orders of magnitude, and he led CI/CD and gRPC integration work. Benjamin pairs deep technical rigor (MSc and BSc in Computer Science with near-perfect GPAs) with hands-on mentorship and cross-team collaboration on distributed, performance-sensitive projects. Notably, his ROCm contributions include workflow and tuning automation that improved kernel selection and build processes for large-scale ML workloads such as LINPACK on Frontier.
10 years of coding experience
4 years of employment as a software developer
Bachelor of Science - BS, Computer Science, 3.89 GPA, Bachelor of Science - BS, Computer Science, 3.89 GPA at University of Calgary
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (6)
assembly10
python10
gpu-acceleration9
auto-tuning9
hip8
gpu7
Programming languages (4)
Github contributions (5)
ROCm/Tensile
Dec 2020 - Dec 2022
Stretching GPU performance for GEMMs and tensor contractions.
Role in this project:
Back-end Developer & Automation Engineer
Back-end Developer & Automation EngineerContributions:135 reviews, 81 commits, 118 PRs in 2 years
Contributions summary:Benjamin contributed to the workflow for manually editing kernels, automating aspects of kernel generation, and improving build processes. This involved creating and preparing assembly directories, generating scripts to automate kernel editing via TensileCreateLibrary, and modifying compilation arguments. Further, the user made enhancements to tuning automation, addressing configuration issues and overhauling tuning scripts for better output, control, and documentation.
amdpythontensorhipauto-tuning
benjaminulmer/subdivision-framework
Sep 2017 - May 2019
Contributions:108 pushes, 20 branches in 1 year 8 months
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