Justin Willmert
Principal Scientist at Donaldson
Minneapolis, Minnesota, United States
Summary
👤
Senior🎓
Top SchoolJustin Willmert is a Principal Scientist and computational physicist with 14 years of experience applying high-performance computing and multi-language analysis (Julia, MATLAB, Python, C++) to large, complex data sets and instrumentation-driven experiments. He built and scaled analysis frameworks for flagship cosmology experiments, led telescope maintenance and calibration teams, and moved raw data to publication-ready products across multi-institution collaborations. Skilled in Linux/SLURM supercomputing environments, he also contributes to core open-source projects like the Julia language and HDF5.jl, fixing bugs and improving performance for widely used scientific tools. Comfortable both managing teams and diving deep into algorithms and profiling, he brings a track record of turning legacy code into parallelized, production-ready pipelines and mentoring others in rigorous analysis practices.
14 years of coding experience
9 years of employment as a software developer
Doctor of Philosophy - PhD, Physics, 3.748, Doctor of Philosophy - PhD, Physics, 3.748 at University of Minnesota
Github Skills (15)
data-storage10
hdf10
programming-language10
sparse-array10
language-design10
julia10
testing10
linear-algebra9
macros9
data-structures8
test-automation8
data-structure8
scientific-computing8
numerical-methods8
hpc7
Programming languages (10)
Github contributions (5)
JuliaIO/HDF5.jl
Aug 2020 - Aug 2021
Save and load data in the HDF5 file format from Julia
Role in this project:
Back-end Developer
Back-end DeveloperContributions:229 reviews, 71 commits, 75 PRs in 1 year
Contributions summary:Justin primarily contributed to the HDF5.jl library by fixing error conditions, adding features, and improving overall functionality. Their contributions included fixing errors related to unmappable datasets and adding the ability to set dataset create-time allocation policies. They also added convenient functions for retrieving create and access property lists of files and datasets. These changes involved modifications to core HDF5 library code, including adding new test cases.
file-formatjulia-languagedata-storagehdf5hdf5-library
JuliaLang/julia
Mar 2018 - Apr 2021
The Julia Programming Language
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:8 reviews, 19 commits, 26 PRs in 3 years 1 month
Contributions summary:Justin primarily contributes to the Julia programming language core, fixing bugs related to macro expansion, enums, and cglobal expressions. They implemented improvements, such as optimizations for sparsity-preserving outer products. Additionally, the user wrote tests to ensure code correctness for features like factorizations and complex number operations, and fixed assignment issues.
sciencejulia-languagemachine-learningjulialangpetsc
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