Jiří Kozlovský
Senior Data Platform Engineer
Brno, South Moravia, Czechia
Summary
👤
Senior🎓
Top SchoolJiří Kozlovský is a Senior Data Platform Engineer and Tech Lead with 11 years of hands-on experience building and optimizing large-scale data platforms, currently based in Brno. He specializes in cloud-to-Kubernetes migrations, streaming and batch processing (Kafka, Spark, Flink, Trino, ClickHouse) and has repeatedly delivered measurable cost and performance gains—most recently driving $75K/month savings while migrating EMR and MSK to self-operated Kubernetes with zero downtime. At Seznam.cz he led a ~100-job ETL migration to Kubernetes, refactored a mission-critical Scala prediction system for notable query speedups, and implemented a 50x HBase latency improvement via a materialized-view coprocessor. He combines platform engineering with developer productivity work, e.g., building an AI-powered Grafana plugin that automates SQL authoring and context injection now used in production. An active open-source contributor across ClickHouse, Trino and Terraform ecosystems, Jiří blends deep systems expertise with practical GitOps, observability and cost-optimization instincts. He’s equally comfortable diving into C++/Java/Go codebases or training teams to operate complex data infrastructure reliably.
11 years of coding experience
11 years of employment as a software developer
Master's degree, Cybernetics, Control and Measurements, Master's degree, Cybernetics, Control and Measurements at Vysoké učení technické v Brně
English, Spanish, Czech, German
Stackoverflow
349reputation
80kreached
21answers
11questions
Github Skills (200)
sendmail10
bug-tracker10
exporter10
disposable10
cpp10
big-data10
dovecot10
dkim10
object-recognition10
bigquery10
imap10
portal10
embedded10
mta10
ldap10
Programming languages (17)
Github contributions (5)
jirislav/azkaban-ldap-usermanager
Apr 2017 - Jul 2019
Ldap authentication for Azkaban
Contributions:2 PRs, 6 pushes, 1 branch in 2 years 3 months
authenticationazkabanldapldap-authenticationcas
jirislav/mailinabox
Oct 2017 - Jun 2018
This fork was Ubuntu 16.04 compatible, now it's abandoned.
Contributions:5 releases, 7 commits, 2 PRs in 8 months
linuxubuntuabandoned
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.