Delta Regeer
Staff Engineer (DevSecOps) at SAP
Katavi Region, United States
Summary
🤩
Rockstar🎓
Top SchoolDelta Regeer is a Staff Engineer (DevSecOps) with 15 years of experience building and securing large, distributed, fault-tolerant systems across cloud and on-prem environments. Currently at SAP, he blends deep Python expertise with systems engineering, DevOps automation, and offensive security experience from roles at Cruise and SAP NS2. A long-time core contributor and maintainer in the Pylons ecosystem (Pyramid, WebOb, Waitress, Colander, Deform), he focuses on compatibility, reliability, and test-driven improvements that many web services indirectly rely on. His background spans low-level C/C++ work, production OpenStack deployments, and running CI/CD and infrastructure at scale, giving him a rare end-to-end view from kernel to cloud. He’s known for pragmatic fixes—like IPv6 hardening and descriptor exhaustion mitigations—and for removing legacy cruft to keep projects secure and maintainable. Based in Katavi Region with a BS in Software Engineering, he combines volunteer event operations experience (DEF CON, Black Hat) with a steady track record of shipping resilient systems.
15 years of coding experience
21 years of employment as a software developer
Bachelor of Science, Software Engineering, Computer Programming, Bachelor of Science, Software Engineering, Computer Programming at University of Advancing Technology
Dutch
Github Skills (29)
unit-testing10
webob10
lib10
python10
validations10
api-design10
testing10
deform10
user-authentication10
authentication10
data-serialization10
wsgi10
validation10
regex10
serialization10
Programming languages (22)
Github contributions (5)
Pylons/webob
Apr 2014 - Jan 2023
WSGI request and response objects
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 reviews, 691 commits, 155 PRs in 8 years 10 months
Contributions summary:Delta primarily contributed to the WebOb library by addressing deprecation warnings, removing deprecated functionality, and ensuring compatibility with newer Python versions. Their work involved modifications to core modules like `exc.py`, `request.py`, `response.py`, and `cookies.py`, indicating a focus on API maintenance and backwards compatibility. They also added documentation, improved test coverage, and removed dependencies, contributing to the stability and maintainability of the project.
wsgi
Pylons/waitress
May 2014 - Jan 2023
Waitress - A WSGI server for Python 3
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:31 releases, 20 reviews, 394 commits in 8 years 9 months
Contributions summary:Delta primarily contributed to bug fixes and improvements related to the core functionality of the Waitress WSGI server. Their work involved addressing issues like connection management, resource handling, and testing the server's behavior. They addressed problems with file descriptor exhaustion on macOS and improved the stability of the server by fixing issues like the incorrect handling of content lengths in responses. Additionally, they implemented tests to validate the correct functioning of the server and included tests to validate how the server handled proxy settings.
pythonwsgi-serverhttp-server
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