Leszek Kałwa
Mikołów, Silesian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolLeszek Kałwa is a seasoned software engineer with over a decade of hands-on experience building production web applications, particularly in Ruby on Rails, and with broad exposure to JVM and modern languages like Scala and Kotlin. He spent 10 years at IQ Lab working across Ruby, Groovy, Java, Neo4j and Kotlin, combining long-term project ownership with multinational corporate practices. Comfortable in remote teams, he pairs pragmatic engineering with a polyglot mindset that lets him choose the right tool for backend, data or integration challenges. His background spans startups and consultancy work—shipping consumer platforms like CoupleWise and PeopleJar—and reflects a preference for deep, sustained contributions rather than short-term sprints. Based in Mikołów, Poland, he brings both an electrical engineering MSc and a CS bachelor’s perspective, which shows in his systematic approach to complex system design.
11 years of coding experience
15 years of employment as a software developer
MSc, electrical engineering, MSc, electrical engineering at The Silesian University of TechnologyBachelor's degree, Computer Science, Bachelor's degree, Computer Science at Wyższa Szkoła Technologii Informatycznych w Katowicach
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (29)
json-api9
stylish9
api8
neo4j-driver8
neo4j8
railtie8
graphiti8
ruby7
driver7
ruby-on-rails7
stream6
api-server6
graph6
rails6
graph-database6
Programming languages (2)
Github contributions (5)
lkalwa/scala-streamable-jsonapi
Jan 2018 - Mar 2021
Library for parsing stream of jsonapi objects
Contributions:9 PRs, 57 pushes, 8 branches in 3 years 2 months
jsonapiparsingstream-parsingstreamparser
lkalwa/graphiti-activegraph
Oct 2022 - Jan 2025
Contributions:10 pushes, 1 branch in 2 years 2 months
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