Jens Rantil
Founder at Sweet Potato Tech AB
Stockholm, Sweden
Summary
🤩
Rockstar🎓
Top SchoolJens Rantil is a founder, software engineer and applied mathematician with 14+ years building resilient distributed systems, SRE/DevOps platforms and backend services from early-stage startups to scale-ups. He blends hands-on coding and infrastructure plumbing with tech leadership—shaping engineering culture, running workshops, and mentoring teams to shorten feedback loops and improve reliability. A pragmatic simplifier, Jens has contributed to well-known open-source projects (e.g., Go LevelDB ports, statsdaemon, Supervisor) where he focused on documentation, test robustness and maintainability. His background in mathematical optimization and diverse research roles informs a methodical approach to system design and performance tuning. Based in Stockholm, he also brings an educator’s instinct—creating knowledge-sharing “waterholes” that make complex topics accessible.
15 years of coding experience
15 years of employment as a software developer
Master Engineering Mathematics, Master Engineering Mathematics at The Faculty of Engineering at Lund UniversityEuropean School of Brussels IIPedagogy, Pedagogy at Lund UniversityTheory of Relativity Physics, Theory of Relativity Physics at Stockholm UniversityComputer Science and Mathematics, Computer Science and Mathematics at University of North Carolina at Chapel Hill
Swedish, English
Stackoverflow
14,478reputation
5.7mreached
83answers
142questions
warnings
top-1%
error-handling
top-5%
go
top-5%
tar
top-5%
logging
top-1%
nginx
top-5%
Github Skills (55)
textbook10
restructuredtext10
pytest10
python10
scripting10
storybook10
testing10
configuration-management10
guideline10
databases10
leveldb10
supervisord10
event-sourcing10
user-guide10
performance-testing10
Programming languages (30)
Github contributions (5)
bitly/statsdaemon
Oct 2013 - May 2014
an implementation of Etsy's statsd in Go
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:2 reviews, 8 commits, 2 comments in 7 months
Contributions summary:Jens primarily contributed to the back-end logic of the statsdaemon project, focusing on improving the accuracy and reliability of timer metrics. They implemented bug fixes related to percentile calculations and added support for lower/negative percentiles. Furthermore, the user added benchmark tests to evaluate the performance of the processing functions, showcasing their focus on code optimization. They also refactored code to make error handling more flexible by allowing the caller to determine how to handle errors.
gostatsd
realpython/python-guide
Jun 2012 - Oct 2013
Python best practices guidebook, written for humans.
Role in this project:Technical Writer
Technical WriterContributions:6 commits, 1 comment in 1 year 4 months
Contributions summary:Jens primarily contributed to the improvement of the documentation within the "realpython/python-guide" repository. Their commits focused on fixing spelling errors, correcting capitalization, and adding cross-references to existing content. Additionally, they included links to external resources, further enhancing the guide's clarity and usability. Their work demonstrates a focus on refining the guide's accuracy and completeness.
python
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