Frantisek Hajnovic
Lead Data Engineer (Experimentation Team)
Stony Stratford, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolFrantisek Hajnovic is a Lead Data Engineer with 13 years' experience architecting scalable data platforms and automation at scale, currently leading experimentation engineering at Just Eat Takeaway.com. He builds programmatically generated, CI/CD-driven pipelines (Airflow, BigQuery, Docker) that process terabytes of data to evaluate hundreds of A/B tests, and has delivered measurable cost savings and technical debt removal. Comfortable bridging data science and engineering, he productionised statistical evaluation methods and mentored cross-functional teams to raise delivery quality. Previously he led platform and ETL transformations at the Valuation Office Agency and ONS, applying PySpark/Databricks and distributed ML for critical public-sector use cases. Known for pragmatic engineering practices—extensive testing, infra-as-code and cost-aware design—he combines deep technical ownership with clear stakeholder-facing communication.
13 years of coding experience
10 years of employment as a software developer
Master's degree Informatics, Master's degree Informatics at Comenius UniversityInformatics, Informatics at Grenoble INP - UGAProgramming, Programming at Gymnazium Jura Hronca
English, French, Slovak, Czech
Stackoverflow
2,378reputation
304kreached
9answers
14questions
scrapy
top-5%
jupyter-notebook
top-5%
Github Skills (14)
jupyter-notebook9
scrapy9
git6
git-stash6
wordpress6
pyspark6
ipython6
plot6
web-crawler6
python6
janino6
bokeh6
wordpress-plugin6
codegen6
Programming languages (3)
Github contributions (5)
silverfield/fhweb
Mar 2020 - Apr 2021
Contributions:2 PRs, 104 pushes, 3 branches in 1 year 1 month
silverfield/cmds
Jan 2017 - Apr 2020
Contributions:12 pushes, 2 branches in 3 years 3 months
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