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Mike Dalessio
Director of Engineering at Shopify
Mike Dalessio is a technology professional with extensive experience in software engineering and leadership roles. He served as the Director of Engineering at Shopify from June 2020 to March 2024, where he led the Ruby and Rails Infrastructure team.3 Prior to his role at Shopify, Dalessio held positions at several prominent tech companies including VMware, Pivotal, and Bloomberg.2
Dalessio is known for his contributions to open-source software and his expertise in Ruby and Rails development. He has maintained commonly-used gems like Nokogiri, SQLite3, and Rails.5 His experience also includes working on Cloud Foundry, where he filled various roles such as engineer, product manager, project lead, and engineering lead.1
As of February 2025, Dalessio is working at 37signals, having started there in September 2024.2 He describes himself as an open-source software contributor, tech advisor, and lover of gummi bears.24
Throughout his career, Dalessio has demonstrated a commitment to advancing Ruby and Rails technologies, with a focus on making them "100-year tools".3 His expertise in this area has led to speaking engagements, such as at the Rails World 2023 conference.5
