Szymon Klimek
Backend Developer (Till & Staff Squad - POS) at SumUp
Pomeranian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolSzymon Klimek is a product-minded backend and Android developer with nine years of professional experience, currently building POS services at SumUp. He combines Kotlin/Java expertise with practical knowledge of Spring Boot, Open API, gRPC and mobile SDKs to deliver safe, well-structured production changes. At SumUp he shipped end-to-end features for high-volume sales platforms, introduced Open API code generation and OpenTelemetry tracing on Android, and created shared libraries for financial calculations across languages. Comfortable owning technical design, on-call responsibilities and documentation, he also brings hands-on experience in observability, CI/CD, Terraform and AWS networking. His background in military leadership adds discipline and a systems-oriented mindset to cross-functional collaboration and product thinking.
9 years of coding experience
5 years of employment as a software developer
Master's degree Military Leadership, Master's degree Military Leadership at General Tadeusz Kościuszko Military Academy of Land Forces
English, Polish
Github Skills (6)
language-learning3
flutter3
chat1
javafx1
java1
grpc1
Programming languages (2)
Github contributions (5)
szymonklimek/langsapp
Aug 2022 - Jan 2025
Simple language learning application. Choose language, learn new words and repeat them according to the schedule calculated by the app.
Contributions:38 PRs, 192 pushes, 64 branches in 2 years 5 months
flutterwordslanguage-learningschedule
szklimek/DietTracker
May 2017 - Sep 2017
Contributions:10 PRs, 23 pushes, 10 branches in 3 months
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