Błażej Kosmowski
Chief Technology Officer at Open Source
Bielsko-Biała Metropolitan Area Poland
Summary
👤
Senior🎓
Top SchoolBłażej Kosmowski is a seasoned technology leader and hands-on engineer with 16 years of experience building and architecting data-driven, cloud-native software. Currently CTO at SoftKraft after a brief term as CEO, he has moved through every layer of the stack—from backend systems and large-scale data processing to frontend UX—and specializes in turning complex business data into actionable intelligence. His background blends deep Ruby on Rails expertise with Java, Python, Go, React/Angular and AWS-driven architectures, and he regularly consults on refactors, API design and high-throughput integrations. An active author, speaker and open-source contributor, he codifies patterns and testing practices for maintainable Rails apps, reflecting a long-standing commitment to developer experience and code quality. Based in the Bielsko-Biała area, he pairs startup agility with enterprise-grade engineering discipline, often surfacing pragmatic solutions from reverse-engineering and legacy modernisation projects.
16 years of coding experience
6 years of employment as a software developer
BSc Software Engineering, BSc Software Engineering at Bielska Wyższa Szkoła im. J. TyszkiewiczaMSc Computer Science, MSc Computer Science at WSB UniversityBSc Software Engineering, BSc Software Engineering at University of Wales
English, Polish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (61)
coercion10
standardized10
lightbox10
activemodel10
breeze9
pattern9
conventions9
design-patterns9
ruby-on-rails9
deprecated8
publish8
aws8
rails8
ruby8
messaging7
Programming languages (4)
Github contributions (5)
stevo/highcharts_on_rails
May 2013 - Feb 2015
Contributions:19 commits, 1 PR, 2 pushes in 1 year 9 months
chartshighchartschartsteroidsdata-visualization
Selleo/pattern
Apr 2017 - Feb 2022
A collection of lightweight, standardized, rails-oriented patterns.
Contributions:3 reviews, 60 commits, 19 PRs in 4 years 10 months
ruby-on-railsrails-oriented-patternsruby-gemrailsruby
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