Leszek Zalewski
Staff Developer at Shopify
Podlaskie Voivodeship, Poland
Summary
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RockstarLeszek Zalewski is a Staff Developer with 14 years of experience building resilient web platforms and distributed services, currently at Shopify and based in Podlaskie, Poland. He brings deep Ruby on Rails expertise complemented by Elixir/OTP and AWS-driven architectures, having led teams and migrations while improving test suites and operational reliability. Leszek has repeatedly combined hands-on development with technical leadership—from speeding up test suites 6x to mentoring cross-functional teams—while steering roadmaps and DevOps work like cloud migrations. He contributes to well-known open-source projects such as Shopify's IdentityCache, improving cache invalidation and test coverage to harden Active Record integrations. Comfortable across the stack, he favors pragmatic, event-driven designs and small, verifiable changes that reduce failure modes in production.
14 years of coding experience
12 years of employment as a software developer
English, Polish
Stackoverflow
416reputation
31kreached
10answers
0questions
Github Skills (14)
testing10
activerecord10
caching10
disk-cache10
object-cache10
web-cache10
memory-cache10
ruby10
ajax6
docker6
validation6
jquery6
nested-attributes6
ruby-on-rails6
Programming languages (11)
Github contributions (5)
Shopify/identity_cache
Nov 2022 - Nov 2022
IdentityCache is a blob level caching solution to plug into Active Record. Don't #find, #fetch!
Role in this project:
Backend Developer
Backend DeveloperContributions:6 reviews, 11 commits, 1 PR in 12 days
Contributions summary:Leszek focused on improving the `IdentityCache` library, particularly related to cache invalidation and management. Their contributions involved refining the `expire_cache` method to ensure accurate cache expiration and consistency. They also added and extended tests to cover failure scenarios and edge cases. These changes aim to improve the robustness and reliability of the caching mechanism within the Active Record integration.
webscalerailsblobcachinghotel-booking
driv3r/dotfiles
Jun 2015 - Jul 2023
Contributions:5 pushes, 1 branch in 8 years 1 month
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