Jeremy Koletar Email & Phone Number

Minneapolis, Mn, Us

* Coded Target's first "Compute@Edge" project, a security program which runs any time someone adds an item to their cart on Target.com* Created the ‘DDoS Mitigation Tool’, an end-to-end cybersecurity incident response tool.* Awarded "Most Valuable Team Member" in December 2022 for my work on the tool* Pushed the envelope in terms of innovation and empowerment for Target Tech engineers

* Web Foundation was Facebook's elite team of first responders for severe production incidents* Investigated and debugged errors in the Facebook PHP web tier, HHVM web server (C++), Proxygen traffic load balancer (C++), and Python automation/scripting* Served as an on-call for Facebook's massive web tier and hourly continuous deployments* Engaged and consulted with product teams on design decisions that affect web tier reliability* Debugged and remediated high severity production incidents, including full site & ad outages* Initiated an engagement with the Facebook SDK team during a reliability lockdown. Consulted with director-level engineering managers on what works and what doesn't for the web tier* Coded and updated Chef recipes for fleet-wide diagnostic tools* Built Python CLI tools to ease operational burdens and add safety guards to risky tasks

* Devised and deployed a realtime web server load metric which increased maximum regional capacity by 2-3% in load tests* Improved accuracy and reduced flakiness of Instagram’s canary testing tool by 18%* Led cross-functional effort to scale Instagram’s Apache ZooKeeper ensemble* Served on a 24/7 on-call rotation supporting Instagram’s web tier and continuous deployment--- Debugging and fixing production issues affecting Instagram’s 800 million users in realtime--- Led followup investigations into incident root causes and devised solutions for prevention* Architected and implemented Instagram’s A/B testing framework integration

* Consulted with engineers on architecture of the game's server software* Built administrative tooling to help solve user support tickets* Designed, configured, and maintained web application server for the game* Initiated the design and publication of user-facing APIs to enhance gameplay* Administered production game server cluster using Python scripts and Puppet* Debug and develop patches for issues with the Panda3D client code* Solve for security, reliability and scalability problems as the game grew to support up to 6,000 concurrent players, 2,000,000 registered users, and 30,000 monthly active accounts* Built and supported custom HTTP client distribution infrastructure for the game

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San Diego, Ca, Us

Minneapolis, Mn, Us

Computer Science

Education record