Lou Kosak
Head Of Product Engineering at Plaid
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolLou Kosak is a seasoned engineering leader with 14 years building and scaling payments, connectivity, and distributed systems, currently serving as Head of Product Engineering at Plaid in New York. He has driven mission-critical payments infrastructure at Airbnb—processing tens of billions annually—and led Plaid teams focused on expanding and hardening network connections to data partners. Lou blends hands-on systems design with strong product sensibilities and a track record of reducing reconciliation times from months to hours and repairing multi-million dollar discrepancies. A former founder and longtime builder of high-traffic, auto-scaling platforms, he emphasizes testable, maintainable architectures and inclusive, collaborative team cultures. He brings a rare mix of operational rigor, cloud-native engineering, and product-focused leadership that helps companies turn complex financial infrastructure into reliable customer-facing experiences.
14 years of coding experience
15 years of employment as a software developer
Bachelor's degree International Development Studies, Bachelor's degree International Development Studies at McGill University
French, Italian
Github Skills (11)
plaid10
java9
ruby9
api9
nodejs9
client-library8
rails8
python8
foursquare6
javascript2
url-shortener1
Programming languages (3)
Github contributions (5)
lkosak/node-hackpad
Feb 2013 - Sep 2013
A client library for the Hackpad API
Contributions:17 commits in 7 months
client-libraryapihackpad
lkosak/dotfiles
Apr 2015 - Mar 2025
Contributions:53 pushes in 10 years
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