Shkelzen Fejzullahu
Senior Staff Software Engineer at Celonis
Munich, Bavaria, Germany
Summary
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Rockstar🎓
Top SchoolShkelzen Fejzullahu is a Senior Staff Software Engineer based in Munich with 11 years of experience building cloud-native, data-intensive systems. He has deep expertise in Java, Spring Boot, Go, Kubernetes, Docker and SQL, and has driven cross-team architecture and delivery at Celonis to replace legacy ETL systems with a unified, scalable data platform. Shkelzen co-led a multi-team rebuild of the data infrastructure, designed a new data service, and authored a query transpilation framework that converted over 2 million queries to the new SQL dialect to ensure seamless migration. He is pragmatic about engineering trade-offs, focusing on reliability, performance and maintainability while creating tooling to reduce operational friction. His background spans startups and enterprise products across Europe, and he brings a hands-on approach to technical leadership and cross-team coordination. Less obvious but indicative of his mindset: he combines backend systems craftsmanship with front-end and tooling fluency (TypeScript/Angular, Elasticsearch), enabling end-to-end impact on data platforms.
11 years of coding experience
10 years of employment as a software developer
Bachelor of Science - BS, Computer Science and Engineering, Bachelor of Science - BS, Computer Science and Engineering at UBT - University for Business and Technology
Stackoverflow
1reputation
283reached
0answers
1question
Github Skills (45)
parser10
optimizer10
tsql9
translation9
sql-parser9
peg9
databricks9
sqlite9
parser-generator9
clickhouse8
python-sql8
python8
hive8
sql8
duckdb8
Programming languages (4)
Github contributions (5)
rinormaloku/DariusSCM
May 2015 - May 2015
Contributions:13 pushes in 10 days
shkelzeen/rest-api
Jan 2018 - Jan 2018
Contributions:5 pushes, 1 branch in 1 day
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