TriCom Technical Services is seeking a Sr. Ruby on Rails Engineer in Montreal to design, build, and maintain backend systems for ecommerce integrations at scale. The role focuses on asynchronous processing, background jobs, and end-to-end ownership of integrations with Shopify and other platforms. The ideal candidate has 5+ years of RoR and Node.js experience, hands-on Shopify work, and solid API design skills. Will collaborate with Product, QA and DevOps to improve scalability and reliability.