Wojciech Pasternak
Freelance Software Engineer at Self-Employed
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolWojciech Pasternak is a seasoned freelance software engineer and engineering manager with 17 years of experience building and scaling backend systems, primarily in Ruby, across startups and large, high-growth organizations. He combines hands‑on development—designing APIs, ledgers, and complex migrations—with people leadership, having grown and mentored remote teams at Toptal during its expansion from ~20 to 200+ engineers. Wojciech excels at extracting domains from monoliths, optimizing developer workflows, and choosing pragmatic tech stacks (e.g., large Ruby upgrades, observability migrations, and evaluating database replacements). He’s passionate about clean, maintainable code and applied design patterns, and often toggles between coding and strategic technical decisions. Based in Warsaw, he brings a track record of delivering innovative, production-grade products in regulated industries like maritime and healthcare, plus a knack for turning messy legacy systems into scalable, developer-friendly platforms.
17 years of coding experience
19 years of employment as a software developer
Master's degree, Information Technology, Master's degree, Information Technology at Cracow University of Technology
English
Github Skills (8)
middleman8
static-site-generation6
validation6
react6
frontend5
static-site-generator4
orm3
ruby3
Programming languages (1)
Github contributions (5)
voytee/activepesel
Nov 2012 - Nov 2013
Simple, ORM agnostic PESEL (Polish Personal ID Number) validator and personal data extractor
Contributions:3 releases, 27 commits, 3 PRs in 1 year
validationdata-extractoragnosticpersonal-datavalidator
voytee/polish_places
Apr 2009 - Apr 2009
Contributions:11 commits in 1 day
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