Michał Janeczek
Javascript Developer at EL Passion
Warsaw, Masovian Voivodeship, Poland
Summary
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SeniorMichał Janeczek is a JavaScript and backend developer based in Warsaw with an unusually early start—over a decade of industry experience compressed into his twenties and more than five years of commercial work in backend and JS roles. He has founded and launched three startups, led teams as a tech lead at Decathlon Rent, and advised product growth at SureSwift Capital, blending hands-on engineering with commercial and leadership instincts. His full-stack background spans Ruby on Rails, .NET, and modern JavaScript, reflecting a flexible, polyglot approach to building web platforms. Michał is also an open-source author and maintains a public portfolio of projects and startups, demonstrating a bias toward shipping and iteration. Comfortable switching between founder responsibilities and deep technical delivery, he brings entrepreneurial grit and a pragmatic focus on product-market fit. Colleagues often note his ability to move quickly from prototype to production while keeping code quality and scalability in view.
12 years of coding experience
7 years of employment as a software developer
Polish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (52)
react-applications10
react-redux10
testcafe10
e2e10
test-framework9
functional-testing9
redux9
browser9
test-automation9
web-testing8
typescript8
espressif8
nodejs8
zigbee8
awesome-typescript-loader7
Programming languages (8)
Github contributions (5)
mjaneczek/mjaneczek.github.io
Jan 2018 - Jan 2021
Contributions:1 PR, 21 pushes, 2 branches in 3 years
crashbreak/crashbreak
Oct 2014 - Oct 2016
Contributions:125 commits, 1 PR, 75 pushes in 2 years
ruby-on-railsrailsrackrubygem
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