Logan Raarup
Co-Founder And CTO at Toptal
Denmark
Summary
👤
Senior🎓
Top SchoolLogan Raarup is a pragmatic CTO and founder with 17 years of engineering experience building robust, production-grade systems across Python, C++, Ruby, Elixir and JavaScript. He co-founded multiple startups including Connie (contract management for media) and Cajour, and consults for enterprises like GE Renewable Energy and Christie's where he designed scalable architectures for everything from wind-turbine blade tooling to data pipelines and ML infrastructure. A hands-on polyglot, he has deep backend expertise—contributing bug fixes and relationship/serialization handling to the popular Flask-Restless project—and routinely moves between embedded firmware, cloud services and SaaS product engineering. He pairs craft-focused software development with practical product instincts, having also built physical production lines and custom hardware for a family kombucha business. Based in Denmark, he combines entrepreneurial grit with a track record of turning complex, regulated workflows into simple, reliable software.
17 years of coding experience
20 years of employment as a software developer
Bachelor Integrated Design Engineer, Bachelor Integrated Design Engineer at Syddansk Universitet - University of Southern DenmarkHTX Service & Communication, HTX Service & Communication at CEU Kolding
Stackoverflow
66reputation
425reached
1answer
0questions
Github Skills (15)
testing10
flask-ask10
api-rest10
rest-api10
sqlalchemy10
pytest10
python10
api-design10
flask10
restful-api10
json9
model-view-controller8
ruby6
ruby-on-rails6
sphinx6
Programming languages (7)
Github contributions (5)
jfinkels/flask-restless
Apr 2013 - Jul 2013
A Flask extension for creating simple ReSTful JSON APIs from SQLAlchemy models.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 commits in 3 months
Contributions summary:Logan focused on improving the functionality and stability of the Flask-Restless extension, specifically addressing HTTP error codes and query handling. They corrected the response codes for various query errors, ensuring adherence to the documentation. The user also implemented features related to handling relationships and validation, including support for nested models and methods, to enhance the API's flexibility. Their work included fixing primary key identification and ensuring correct serialization of objects, making significant contributions to the extension's robustness.
pythonsqlalchemy-modelsblueprintsqlalchemyflask-api
OS2Consul/os2consul
Jan 2022 - Apr 2025
Contributions:1 review, 1 PR, 36 pushes in 3 years 3 months
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