Piotr Zerynger
Starszy Specjalista at National Information Processing Institute
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolPiotr Zerynger is a seasoned Java backend engineer and systems analyst with over 20 years of experience delivering IT solutions for the banking and public sectors, currently serving as Starszy Specjalista at the National Information Processing Institute in Warsaw. He combines deep domain knowledge of PSD2/PolishAPI, SEPA ISO 20022, and banking integrations with hands-on expertise in Java 8+, Spring Boot, MongoDB, CI/CD and automated testing. Known for transforming informal client needs into formal UML/BPMN analyses, he prefers fact-based requirements and produces pragmatic, auditable designs for complex projects. Piotr has led architecture and integration efforts at central bank and large financial institutions, implemented production negotiation and payment systems, and introduced CI/CD practices across teams. Multilingual (Polish, fluent Spanish, English B2) and ITILv3 certified, he also works as an independent consultant able to move quickly between analysis, design and implementation. An uncommon strength is his aptitude for converting stakeholders’ everyday language into formal specifications that reliably drive development.
10 years of coding experience
22 years of employment as a software developer
The diploma have the Hague Convention Apostille. Nostryfikacja MEN w Polsce : Inżynier Informatyk., Informatyka i Statystyka, The diploma have the Hague Convention Apostille. Nostryfikacja MEN w Polsce : Inżynier Informatyk., Informatyka i Statystyka at Universidad Veracruzana
English, Spanish, Polish
Stackoverflow
86reputation
5kreached
7answers
3questions
Github Skills (22)
payment-service10
payment10
banking10
banking-applications10
sandbox9
arxiv9
arraylist6
hibernate6
hibernate-types6
spring-boot6
machine-learning6
google-app-engine6
gcloud6
if-statement6
java6
Programming languages (2)
Github contributions (5)
ITger/PolishAPI_sample
Mar 2019 - Nov 2021
PSD2 PolishAPI 3.0 sample implementation
Contributions:141 commits, 116 pushes, 1 branch in 2 years 8 months
bez-autoryzacjipayment-services-directive-2accessibleimplementacjapayment-service
ITger/DualSIMCard
Aug 2015 - Mar 2019
Contributions:9 commits, 3 pushes, 1 branch in 3 years 8 months
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