Greg Kaczorek
Principal Engineer Biling Team at Toptal
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolGreg Kaczorek is a principal engineer based in Warsaw with over a decade of hands-on experience building and leading web-facing engineering teams, currently owning billing systems and revenue features at Toptal. He blends deep technical craftsmanship—having built GraphQL APIs and re-engineered legacy platforms—with people leadership, previously managing a 12-person team for enterprise sales operations. Greg has a track record of turning complex finance and product requirements into reliable, high-impact systems while amplifying other engineers’ productivity. His background spans Ruby, PHP, Java, .NET and mobile, and he pairs a technical Master’s in Computer Science with practical product and delivery ownership. Notably, he moves between tactical engineering and strategic influence, often acting as the connective tissue between finance, sales, and engineering to deliver measurable business outcomes.
12 years of coding experience
14 years of employment as a software developer
Master's degree Computer Science, Master's degree Computer Science at Polish-Japanese Academy of Information TechnologyEngineer's degree Management and Marketing, Engineer's degree Management and Marketing at Warsaw University of Technology
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (182)
python10
windows10
ruby10
automation10
home-assistant10
markdown10
mqtt10
linux10
site-generator10
shell10
home-automation10
json10
serializer10
console10
static-site-generator10
Programming languages (14)
Github contributions (5)
GregPK/gkaczorek.com
Oct 2015 - Sep 2019
Contributions:3 pushes, 3 branches in 3 years 11 months
beautiful-jekylljekylljekyll-thememobile-firstbeautiful-jekyll-theme
GregPK/active_model_serializers
Oct 2016 - Aug 2019
ActiveModel::Serializer implementation and Rails hooks
Contributions:10 pushes, 2 branches in 2 years 10 months
railsrubyserializeractivemodelhooks
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