Senior Ruby Engineer

Location: London, England, United Kingdom, Manchester, England, United Kingdom, Sheffield, England, United Kingdom, New York, New York, United States

Department: Product & Technology

Workplace: remote

Employment Type: full

Description

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.
• You are very familiar with the Ruby object model - eigenclasses, method dispatch, method_missing, send, and all variable types.
• Expert skills with Ruby idiomatic patterns, terse styling, metaprogramming and be able to create macros, DSLs, etc.
• Have experience contributing to wildly used gems or developed internal DSLs for domain specific needs.
• Ruby without Rails - you are able to develop complex applications and deploy Rails features vs custom Ruby plugins for the right use cases.
• Proficiency in building APIs and distributed services using Ruby.
• Must know the full ins/outs of Rails AREL, performant code, and proper Sidekiq job handling.
• Have expert knowledge of proper data model design for e-commerce concerns and understand how to handle locking sensitive resources such as a credit card charge and concepts such as state machines.
• Expert experience with PostgreSQL, including complex joins and reporting queries, and familiarity with data modeling and performance optimization.
• Familiarity with cloud infrastructure (e.g., AWS, ECS, CodeBuild) and containerization (Docker,).
• Strong understanding of system design, data structures, and algorithmic principles.
• Comfortable working in high-growth, early-stage environments—bias toward action and strong product sense are key.
• A 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.

Requirements

What You’ll Do

• Design and implement scalable, high-performance backend systems to power our e-commerce experience.
• Build and maintain APIs that support our frontend, mobile, and third-party integrations.
• 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

• 7+ years of experience building and scaling backend systems in production environments.
• Genuine Rubyist having written custom DSLs and/or contributed to a major Ruby gem with the deepest knowledge of how to utilize Ruby’s metaprogramming capabilities for maximal terse and DSL-centric applications.
• Experience with the specific challenges of concurrency, inventory management/reservation, currency/price management, and third party API integration system designs - push, pull, effective normalization, etc.
• High familiarity with excellent microservices software design - using software DSLs over cloud deployed solutions - across dozens of models, concerns, and integrations.
• Experience with relational databases (e.g., PostgreSQL) and familiarity with data modeling and performance optimization.
• Familiarity with cloud infrastructure (e.g., AWS) and containerization (Docker, Kubernetes).
• Experience developing and deploying GraphQL and RESTful API interfaces.
• Experience developing multi tenant systems, relating to concerns of access control, reporting, and authorization/authentication.
• Strong understanding of system design, data structures, and algorithmic principles.
• Comfortable working in high-growth, early-stage environments—bias toward action and strong product sense are key.
• A 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.

Benefits

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.

Let’s build something people talk about. Together.