Senior Ruby Engineer

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. 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. 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.