Gentian Demaj
Senior Software Engineer - Card & Banking at Klarna
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolGentian Demaj is a Senior Software Engineer based in Berlin with 10 years of experience designing high-performance stream and batch ETL/ELT pipelines for banking, fraud decisioning, and BI solutions. At Klarna he architected a risk and fraud decisioning engine handling tens of thousands of requests per second and cut regulatory reporting pipelines from days to hours by rethinking lakehouse ingestion patterns. Proficient in Python, TypeScript, Java and AWS, he combines deep data engineering expertise with pragmatic system design to deliver reliable, low-latency systems under tight SLAs. Gentian also has a background modernizing legacy systems into asynchronous microservices and a proven track record improving data quality to nearly 99.9%, reflecting a focus on observability and operational resilience. Outside work he’s a Python enthusiast who apparently loves apple pie and black coffee—small hints of a methodical, detail-oriented engineer who also enjoys simple pleasures.
9 years of coding experience
5 years of employment as a software developer
Gymnasium "Bedri Pejani"Universiteti i Prishtinës "Hasan Prishtina"
English, Albanian, German
Stackoverflow
41reputation
385reached
1answer
3questions
Github Skills (9)
qi6
nao-robot6
el6
cdi6
sqlalchemy6
postgresql6
jsf6
python6
pepper6
Programming languages (1)
Github contributions (5)
demaj/movie-api
Aug 2021 - May 2022
Contributions:14 commits, 16 pushes, 1 branch in 8 months
demaj/shop-api
Aug 2021 - Jan 2023
Contributions:12 commits, 16 pushes, 2 branches in 1 year 5 months
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