Ronnie Kolehmainen
Sr Lead Backend Software Engineer at Electronic Arts (EA)
Los Angeles, California, United States
Summary
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RockstarRonnie Kolehmainen is a seasoned backend engineering leader with 15 years building scalable online systems for AAA games, currently serving as Sr Lead Backend Software Engineer for Battlefield Foundational Tech at Electronic Arts in Los Angeles. He combines hands-on performance engineering and backend feature delivery with people leadership, having progressed through multiple roles across DICE, Ripple Effect Studios and other EA studios. Ronnie contributes to open-source tooling for performance testing—most notably enhancing locustio/locust with finer-grained response handling, avg_wait controls and performance optimizations—bringing practical insights from load-testing into production systems. His career shows a steady focus on online game infrastructure, reliability and iteration velocity, often working on behind-the-scenes systems that keep live services healthy. Colleagues describe him as a pragmatic problem-solver who balances shipping features with measurable operational improvements. He pairs deep technical expertise with experience scaling teams and services in high-pressure live-service environments.
15 years of coding experience
22 years of employment as a software developer
Stackoverflow
86reputation
2kreached
3answers
0questions
Github Skills (17)
performance-monitor10
python10
loadtest10
http10
performance-analysis10
load-testing10
benchmark9
benchmarking9
urllib8
debug8
debugging8
gevent7
firefox6
android6
css6
Programming languages (3)
Github contributions (5)
locustio/locust
Jan 2015 - Sep 2015
Write scalable load tests in plain Python 🚗💨
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:1 PR, 1 push, 1 comment in 8 months
Contributions summary:Ronnie primarily contributed to the back-end of the load testing framework, implementing new features and improving existing ones. They added functionality for more granular control over responses, like handling HTTP errors, and introduced the `avg_wait` feature to allow for more nuanced wait times. Several commits focus on performance improvements, including optimizing cache times and fixing alignment issues in the stats view.
scalablestress-testingbenchmarkingpythonload-testing
ronniekk/css-x-fire
Sep 2010 - Jun 2016
Contributions:296 commits, 2 pushes, 1 comment in 5 years 9 months
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