Jaroslaw Kijanowski
Senior Software Engineer at Keyar
Warsaw, Masovian Voivodeship, Poland
Summary
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Senior🎓
Top SchoolJaroslaw Kijanowski is a Senior Software Engineer with 16 years of hands-on experience building resilient, data-driven systems using Java, Kafka Streams, Apache Beam and the Java EE / SpringBoot ecosystem. He has delivered production projects across relational and NoSQL databases (Oracle, Postgres, MySQL, Cassandra), message platforms (Kafka, Oracle AQ, HornetQ) and integration layers (Apache Camel, JBoss ESB), often deploying to AWS, GCP and Heroku with Docker-based automation. A Confluent-certified Kafka developer and operator, Certified Architect on Apache Cassandra and AWS Certified Solutions Architect, he combines deep streaming and distributed-systems expertise with practical operational know-how. He’s led teams, spun off new projects and run a long-standing consultancy (Keyar), balancing hands-on engineering with mentoring and training. Based in Warsaw, he also writes technical posts on Medium, reflecting a habit of turning complex distributed-systems trade-offs into readable guidance. Notably, his background spans both product engineering roles at companies like DataStax and platform-focused QA and administration early in his career, giving him a rare full-stack view of system reliability.
16 years of coding experience
18 years of employment as a software developer
MSc Computer Science, MSc Computer Science at Warsaw University of Technology
English, German
Github Skills (82)
benchmark10
messaging10
csrf10
performance-testing10
session-management10
akka10
jwt10
sbt10
java10
session-cookie10
akka-http10
common-library10
ansible9
message-queue9
queuing9
Programming languages (6)
Github contributions (5)
softwaremill/akka-http-session-faq
Sep 2017 - Mar 2020
Contributions:5 commits, 1 push in 2 years 6 months
kijanowski/kafka-streams-scaling
Jun 2019 - Feb 2021
Contributions:10 commits, 9 pushes, 1 branch in 1 year 8 months
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