Senior Ruby Engineer in Manchester

• What You’ll Do
• Design and implement scalable, high-performance backend systems to power our e-commerce experience.
• Build and maintain interfaces that support our frontend, mobile, and third‑party integrations.
• Be very experienced working with pull, push models for data parity between third parties and our systems around e‑commerce concerns of product, stock, orders and fulfillment synchronization.
• You’ll design, implement and deploy reliable software to solve complex e‑commerce concerns.
• Architect systems for membership access, catalog management, checkout, order fulfillment, and payments.
• Collaborate cross‑functionally with product, design, and data teams to deliver features that elevate the user experience.
• Own backend services end‑to‑end, from design to deployment and monitoring.
• Contribute to best practices in code quality, testing, reliability, and observability.
• Help define our backend architecture and make strategic technical decisions as we scale.
• Mentor junior engineers and foster a culture of technical excellence and collaboration.

Who You Are

• 8+ years of experience building and scaling backend systems in production environments.
• 4+ years leading Ruby cloud stack teams as a Principal Engineer/Architect.
• Deep familiarity with the Ruby object model – eigenclasses, method dispatch, method_missing, send, and all variable types.
• Expert skills with Ruby idiomatic patterns, metaprogramming, and the ability to create macros, DSLs, and contribute to widely used gems.
• Proficient in developing complex applications without Rails and in deploying Rails features versus custom Ruby plugins as appropriate.
• Experience building APIs and distributed services using Ruby.
• Knowledge of Rails AREL performance characteristics, Sidekiq job handling, and efficient code patterns.
• Expert knowledge of data‑model design for e‑commerce, including locking sensitive resources (e. g., credit card charges) and using state machines.
• Advanced Postgre SQL expertise: complex joins, reporting queries, data modeling, and performance optimization.
• Familiarity with cloud infrastructure (AWS, ECS, Code Build) and containerization (Docker).
• Strong understanding of system design, data structures, and algorithmic principles.
• Experience with concurrency, inventory management/reservation, currency/price management, and third‑party API integration system designs with pull/push normalization.
• High familiarity with microservices design, employing software DSLs for cloud‑deployed solutions across numerous models, concerns, and integrations.
• Expertise in Graph QL and RESTful API development and deployment.
• Experience developing multi‑tenant systems, addressing access control, reporting, and authentication/authorization concerns.
• Comfortable working in high‑growth, early‑stage environments with a bias toward action and strong product sense.
• Collaborative teammate who communicates clearly and is excited to shape the future of a luxury tech brand.
• Bonus Points
• Prior experience in e‑commerce, marketplaces, or membership‑based platforms.
• Familiarity with event‑driven architectures and message queues (Kafka, SQS, etc).
• Experience working closely with design or product teams in consumer‑facing companies.
• Passion for fashion, luxury, or retail innovation.
• Why Join MILE
• Opportunity to play a key role in shaping the future of the company.
• Collaborative and innovative work environment.
• Career growth opportunities in a fast‑growing organisation.
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