Jeffrey Gelens
Owner & Engineer at ELLA
Netherlands
Summary
👤
Senior🎓
Top SchoolJeffrey Gelens is a seasoned computer engineer and consultant with 15+ years designing high-performance, highly available web applications and resilient infrastructure for clients worldwide. As founder of Qonvoy (formerly Noppo/Bakku) and technical leader at companies like HackerOne and Silver Egg, he blends hands-on systems engineering with platform architecture, API design, and self-healing infrastructure. He has led complex cloud migrations and DR exercises, built Docker/Salt/Consul/ECS orchestration, and implemented production-grade CI/CD and security integrations such as DUO/Okta. An active open-source contributor, Jeffrey has improved core backend libraries (moto, gevent-socketio, django-admin-tools), fixing concurrency bugs and expanding test coverage—work that underpins reliable AWS mocking and realtime web stacks. Based in the Netherlands, he pairs deep Unix (Linux/FreeBSD) admin skills with a persistent focus on re-engineering legacy systems into scalable, maintainable platforms.
15 years of coding experience
16 years of employment as a software developer
Japanese Language Augmented Reality, Japanese Language Augmented Reality at The University of OsakaComputing Science, Computing Science at University of Groningen
Japanese, English, Dutch
Stackoverflow
47reputation
9kreached
2answers
0questions
Github Skills (26)
boto10
python10
django10
testing10
websocket10
gevent10
websockets-client10
aws10
mocking10
websocket-client10
client-websocket10
admin9
dashboard9
ec9
amazon-s39
Programming languages (20)
Github contributions (5)
abourget/gevent-socketio
Nov 2010 - Mar 2012
Official repository for gevent-socketio
Role in this project:
Back-end Developer
Back-end DeveloperContributions:50 commits in 1 year 3 months
Contributions summary:Jeffrey primarily contributed to the core functionality of the `gevent-socketio` library. Their commits focused on refactoring the codebase, renaming functions, and adding comments to improve readability. They implemented core features such as message handling, heartbeats, and connection management. Additionally, the user addressed code cleanup and bug fixes, improving the overall stability and maintainability of the project.
websocketsocketiogeventsocket-io
getmoto/moto
Mar 2015 - Feb 2017
A library that allows you to easily mock out tests based on AWS infrastructure.
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:5 commits, 2 PRs, 4 comments in 1 year 11 months
Contributions summary:Jeffrey primarily focused on enhancing the project's backend functionality, particularly related to AWS infrastructure mocking. They fixed thread safety issues in the server code, ensuring reliable operation. The user also contributed to improving test coverage, including adding and modifying tests related to various AWS services such as cloudformation and SNS. Their work involved modifying existing code and creating new tests for better functionality and reliability within the moto framework.
ec2bototestinginfrastructureaws-infrastructure
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