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LEONARDO
PEREIRA
Senior Engineer based in London, Canada 🇨🇦 — currently at Shopify.
I’ve spent my career moving ideas into incredible products. I love Ruby and Rails, use the best of modern TypeScript to create amazing experiences, and teach engineers how to write beautiful code and get better at the craft.
I'm currently working at Shopify. Before that: Hona, OrderProtection.com, Route, Decisiv, Silverfin, and a lot of shipped side quests. If you're building something hard and useful, email me.
2024 — PRESENTACTIVE
Shopify / Senior Engineer · Growth
Growth engineering at Shopify — monetization and conversion work on surfaces customers actually use.
2024
Hona / Staff Software Engineer
Early-stage full-stack product work: architecture, delivery habits, and enough hands-on code to keep decisions honest.
2023 — 2024
OrderProtection.com / Staff Software Engineer
Architecture across 8+ services, with a lot of TypeScript, React, Preact, and quality work on the customer experience.
2020 — 2023
Route / Senior Software Engineer
Defined code standards and architecture for a high-traffic e-commerce protection platform; mentored 5+ engineers and shipped merchant integrations end-to-end.
2018 — 2020
Decisiv / Senior Software Engineer
Scalable Rails applications for fleet service management, delivered cross-functionally.
2016 — 2017
Silverfin / Software Engineer · Ghent, Belgium
Financial reporting tooling, built with a distributed multicultural team.
2007 — 2016
Earlier / Trat.to · Skore.io · Focus Networks · independent
From PHP-era contract work to technical leadership — consulting, digital wallets, learning platforms, and a lot of shipped side quests.
I’m a product engineer first: I like taking fuzzy ideas, shaping them into something real, and sweating the details until the experience feels right. Rails and TypeScript are the main tools in my hands; AI, agents, and Pi are leverage I build around the craft — useful for context, review, testing, and moving faster without giving up judgment.