Simon De Haan
Co-Founder at Turn.io
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolSimon De Haan is a seasoned engineering leader and co-founder with 15 years of experience building scalable messaging and social platforms, currently leading Turn.io from Amsterdam. He combines hands-on backend expertise—especially in messaging, USSD and SMS integrations demonstrated through contributions to RapidPro and Vumi—with product and operational leadership from prior roles as Chief Engineer at Praekelt. Simon has deep experience maintaining and packaging open-source Python projects (e.g., django-dirtyfields) and shipping reliable integrations for emerging-market communication channels. Passionate about using technology to help society’s most vulnerable, he blends pragmatic engineering, ecosystem stewardship, and startup grit to deliver mission-driven systems.
15 years of coding experience
16 years of employment as a software developer
Schutz American SchoolAmman Baccalaureate SchoolHU University of Applied Sciences Utrecht (Hogeschool Utrecht)
Github Skills (14)
database-migrations10
smpp10
packaging10
apim10
database-migration10
api10
back-end-development10
redis10
python10
django10
setuptools10
git9
http8
json7
Programming languages (16)
Github contributions (5)
praekeltfoundation/vumi
Jan 2011 - Jul 2017
Messaging engine for the delivery of SMS, Star Menu and chat messages to diverse audiences in emerging markets and beyond.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1890 commits, 21 PRs, 34 pushes in 6 years 7 months
Contributions summary:Simon contributed to the Vumi platform by implementing and modifying features related to the Airtel USSD transport. Their work involved creating and updating configuration options, handling session management, implementing session cleanup procedures, and modifying inbound message processing logic. The user also demonstrated expertise in form-based data handling and integrating the USSD transport with various aspects of the Vumi platform, including message dispatch and delivery reports.
diverseaudiencessms-messagesmenuchat
romgar/django-dirtyfields
Jan 2011 - Jun 2015
Tracking dirty fields on a Django model
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 6 PRs, 8 pushes in 4 years 5 months
Contributions summary:Simon primarily focused on packaging and releasing the `django-dirtyfields` project, including updating the `setup.py` file for PyPI releases. They bumped the version number in multiple commits, signaling active maintenance and updates. Furthermore, the user integrated changes from the master branch and updated the `AUTHORS` file, indicating project management and contribution to the project.
pythondjangodjango-modeltrackingdirty
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