Grzegorz Kołodziejczyk
Senior Software Engineer at Missive
Wrocław, Lower Silesian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolGrzegorz Kołodziejczyk is a Senior Software Engineer with 12 years of experience specializing in Ruby and Ruby on Rails, currently building products at Missive from Wrocław, Poland. He co-founded and scaled Ragnarson, a Warsaw-based software house, where he moved from senior developer to co-owner, helping startups ship rapid MVPs, rewrite legacy systems, and manage post-acquisition integrations. His background blends hands-on engineering with product-focused delivery and operations, including maintaining dedicated hosting solutions for client applications. He holds advanced computer science training from DTU and Politechnika Łódzka, reflecting strong academic foundations alongside practical startup experience. Known for pragmatic architecture and speedy iteration, he thrives on turning ambiguous product ideas into production-ready web applications. Beyond coding, he brings entrepreneurial instincts from co-founding Shelly Cloud and leading client-facing technical teams.
12 years of coding experience
7 years of employment as a software developer
MSc, Computer Science, MSc, Computer Science at Politechnika ŁódzkaComputer Science, Computer Science at Copenhagen University College of EngineeringTechnical University of Denmark
English, Polish
Github Skills (34)
pts10
infiniband10
freertos10
mcu10
git-repository10
bluetooth-le10
microcontroller10
hardware10
zephyr10
iot10
automation10
rtos10
bluetooth10
embedded10
architectures10
Programming languages (4)
Github contributions (5)
kolodgrz/zephyr
Nov 2017 - Nov 2018
Primary GIT Repository for the Zephyr Project
Contributions:16 pushes, 8 branches in 1 year
git-repositoryversion-controlzephyr
kolodgrz/Bluez-autopts
Jul 2016 - Aug 2016
Contributions:18 pushes, 7 branches, 5 comments in 1 month
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