Mariusz Pietrzyk
Angel Investor at Ragnarson Fund
Łódź Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMariusz Pietrzyk is a seasoned software leader and entrepreneur with 17 years of experience building product-focused web applications and a track record of founding and scaling a transparent, self-managed software company, Ragnarson. As COO and former CTO/co-founder of Shelly Cloud, he combines hands-on Ruby/Rails engineering with product and hosting expertise, having shipped MVPs, rewritten legacy systems, and run a Heroku-like hosting platform in Poland. He now invests through Ragnarson Fund, advising and funding AgTech startups that tackle climate and food-system challenges by combining capital, software, and domain guidance. A proponent of radical transparency and employee autonomy, he runs a fully remote-first company where colleagues set salaries and manage OKRs, reflecting his belief that people can self-organize without traditional bosses. Educated with a Master’s in Computer Science, he learned entrepreneurship early by growing Shelly Cloud to 100+ paying customers and later applied those lessons to build a decade-long software house serving dozens of startups. Less obvious: his career weaves deep technical craftsmanship with organizational design experiments, making him equally fluent in code, cloud operations, and building unconventional company cultures.
17 years of coding experience
9 years of employment as a software developer
Master's degree Computer Science, Master's degree Computer Science at University of LodzXXIII Liceum Ogolnoksztalcace w Lodzi
English, Polish
Github Skills (39)
filesystem9
airtable9
callback9
mongodb-driver9
command-line-tool9
whiteboard8
react8
mongodb8
command-line-interface8
ruby8
fire-and-forget7
sudo7
nextjs7
api7
orm7
Programming languages (4)
Github contributions (5)
wijet/cleaner
Dec 2011 - Feb 2012
Contributions:52 commits in 2 months
Ragnarson/after_commit_queue
Jun 2012 - Oct 2015
after_commit_queue allows to run callbacks after transaction is committed
Contributions:20 commits, 2 pushes, 2 tags in 3 years 4 months
callback
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