Sr. Ruby on Rails Engineer

Sr. Ruby on Rails Engineer

Summary

We are seeking a Sr. Ruby on Rails Engineer to design, build, and maintain back-end systems that integrate with eCommerce and third-party platforms at scale.  This role is heavily focused on asynchronous processing (background jobs, event-driven architecture, and message queues) and requires hands-on Shopify platform experience (custom apps, APIs, or Shopify Plus environments).  The ideal candidate is comfortable owning integrations end-to-end, from data flow design through production monitoring.  They need not be an expert but should understand options including AWS and SQS and be able to consult with others.
Responsibilities

• Design, build, and maintain Ruby on Rails applications and services supporting core business and eCommerce workflows.
• Consult with clients to translate requests into Jira tickets, delegate work, and perform hands-on development.
• Develop and maintain asynchronous processing pipelines using background job frameworks (Sidekiq, Resque, or similar) and message queues (Kafka, RabbitMQ, SQS, or similar).
• Build and support integrations with Shopify (Admin API, storefront API, webhooks, or custom app development) and other third-party/eCommerce platforms.
• Architect event-driven systems that reliably synchronize data across internal services and external platforms.
• Write clean, tested, maintainable code and participate in code reviews.
• Troubleshoot and resolve issues in distributed systems including failed jobs, race conditions, and data consistency problems.
• Collaborate with Product, QA, and DevOps teams to ship features and improvements on schedule.
• Monitor system performance and reliability; implement improvements to scalability and fault tolerance.
• Document integration architecture, data flows, and API contracts for internal and client-facing reference.

Requirements

• 5+ years of professional experience developing in Ruby on Rails and Node.js.
• eCommerce integration experience across PIMs, order management systems, payment providers, and multiple builds, along with the ability to make recommendations.
• Experience with Shopify extensions and functions, Ruby on Rails, Node.js, and PHP.
• Demonstrated experience with asynchronous/background processing (Sidekiq, Resque, Delayed Job, or similar) and message queue technologies.
• Hands-on experience with the Shopify platform including API integrations, custom app development, or Shopify Plus implementations.
• Solid understanding of RESTful and/or GraphQL API design and integration patterns.
• Experience with relational databases (PostgreSQL or MySQL) and query optimization.
• Working knowledge of event-driven architecture and webhook-based integrations.
• Familiarity with version control (Git) and CI/CD pipelines.
• Strong debugging skills across distributed, multi-service systems.

Preferred

• Experience with Kafka, RabbitMQ, or AWS SQS/SNS in production environments.
• Familiarity with additional eCommerce platforms (BigCommerce, Magento, WooCommerce) beyond Shopify.
• Experience with containerization (Docker) and Cloud infrastructure (AWS, GCP, or Azure).
• Exposure to microservices architecture.
• Experience in a client-facing or consulting/staffing engagement environment; consultative approach, problem solver who is fluent in English with strong written and verbal communication skills, able to explain technical tradeoffs to non-technical stakeholders.
• Comfortable working independently and owning a system, end-to-end.

This is a 12-month Contract opportunity with potential for hire with our Montreal, Quebec client. Low-cost employee benefits, paid time off and paid Holidays. H-1B visa sponsorship is not available for this position. No third-parties, please.