Grzegorz Kielak
Senior Node.js Developer at Investcore Sp. z o.o. Sp. k.
Warsaw, Masovian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolGrzegorz Kielak is a Senior Node.js developer with 12 years of experience building scalable backend systems and domain-driven architectures, currently based in Warsaw. He has led design and implementation of high-availability services in sectors ranging from urban mobility and gaming to military-grade geoinformation and healthcare integrations. Skilled in Node.js and TypeScript, he applies DDD and Hexagonal Architecture to deliver reliable, real-time processing and interoperability (HL7, ICD, ICF) for complex, regulated domains. Notable projects include an urban mobility platform combining parking and transport services and a medical casualty-tracking system that fuses geoinformation with biomedical sensors. He blends hands-on implementation with architectural ownership, frequently tackling data migrations and systems that must scale to millions of users or operate under life-critical constraints.
12 years of coding experience
9 years of employment as a software developer
Inżynier (Inż.) Informatyka, Inżynier (Inż.) Informatyka at Military University of Technology
Polish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (75)
infinite-scroll10
datepicker10
typescript10
nette9
keyboard9
sql9
dbal9
localization9
database9
rust9
postgresql9
typescript-definitions9
abstraction9
serverless9
snowflake9
Programming languages (4)
Github contributions (5)
Grzesie2k/BattleAPI
Mar 2014 - Jan 2017
Contributions:28 commits, 20 pushes, 6 branches in 2 years 10 months
Grzesie2k/react-saga-init
Aug 2019 - Mar 2020
Bootstrap for admin panel in React+Redux+Saga with TypeScript
Contributions:93 commits, 2 PRs, 18 pushes in 7 months
reactadmin-paneladminredux-sagasaga
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