Maciej Łopatka
Staff Engineer at Fresha
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMaciej Łopatka is a Staff Engineer based in Warsaw with 15 years of experience building resilient, high-throughput systems and a strong focus on payments infrastructure. At Fresha he has led the move from monoliths to event-driven microservices, introduced self-healing architecture patterns, and driven pragmatic adoption of gRPC and GraphQL to improve service interoperability. Proficient in Elixir, Ruby and SQL, he combines low-level systems experience from C++ database work with modern API and gateway design. He has repeatedly taken ownership of critical subsystems—from PCI-compliant payment flows to authentication layers—balancing reliability with developer ergonomics. Maciej’s background in both computer science and mathematics underpins a methodical approach to complex distributed problems. Colleagues describe him as a hands-on technical lead who prefers shipping incremental, observable improvements that reduce operational toil.
15 years of coding experience
12 years of employment as a software developer
Master’s Degree, Computer Science, Master’s Degree, Computer Science at University of Warsaw
Github Skills (35)
thai9
normalizing9
prefix8
payment8
payment-gateway8
payment-service7
faraday7
formatting7
payment-integration7
plug7
phone-number7
payment-processing7
adyen7
paystack6
api-client6
Programming languages (2)
Github contributions (5)
saner/fun-os
Mar 2012 - Nov 2012
Contributions:33 commits in 7 months
saner/hs-javalette-compilers
Nov 2010 - Nov 2011
Contributions:22 commits in 1 year
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