Nils Van Velzen
Senior Scientific Software Engineer at Vortech
Randstad, Netherlands
Summary
👤
Senior🎓
Top SchoolNils Van Velzen is a Senior Scientific Software Engineer with over a decade of experience building and optimizing high-performance simulation and data-assimilation software for domains ranging from air quality and hydrology to seismic processing and chemical engineering. He is a core architect and developer of OpenDA, an open-source framework for data assimilation and model calibration, and has a strong track record of parallelizing numerical algorithms for HPC and cloud platforms. With a PhD in Mathematics and deep expertise in numerical methods, Nils blends rigorous mathematical thinking with pragmatic software engineering to deliver production-ready scientific codes. He thrives in multidisciplinary teams, partnering with domain experts to turn complex models into calibrated, efficient systems used in operational forecasting and industry workflows. Beyond development, he has driven business functions at VORtech—shaping sales earlier and now overseeing finances—demonstrating rare breadth from hands-on engineering to company strategy.
11 years of coding experience
24 years of employment as a software developer
MSc Mathematics, MSc Mathematics at Leiden UniversityPhD Mathematics, PhD Mathematics at Delft University of Technology
Dutch, English, German, French, Czech
Github Skills (9)
open-data10
toolbox10
ports8
command-line7
openjdk7
macos7
macports4
powerpc4
python3
Programming languages (3)
Github contributions (5)
OpenDA-Association/pyopenda
Nov 2021 - Apr 2025
Python implementation of OpenDA
Contributions:5 reviews, 10 PRs, 58 pushes in 3 years 5 months
python
vortechbv/OpenDA
Oct 2018 - Jan 2020
Open data assimilation toolbox
Contributions:5 PRs, 2 pushes, 2 branches in 1 year 3 months
toolboxassimilationopen-datadata-assimilation
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