Senior Ruby Engineer

MILE; Greater London; On-site; GBP 80,000 - 100,000; Full time

Benefits offered by this job

Key role in shaping the company

Collaborative work environment

Career growth opportunities

Job summary

A luxury tech brand in Greater London seeks a Backend Engineer with expertise in Ruby to design and implement scalable systems for their e-commerce platform. The ideal candidate has 7–8+ years of experience in backend development, strong skills in API development, and familiarity with cloud infrastructure. They will own backend services end-to-end, contributing to innovative solutions in a collaborative environment. Career growth opportunities are available in this fast-growing organization.

Qualifications

• 7–8+ years of experience building and scaling backend systems in production environments.
• Expert skills with Ruby idiomatic patterns and metaprogramming.
• Experience developing and deploying GraphQL and RESTful API interfaces.

Responsibilities

• Design and implement scalable backend systems for e-commerce.
• Collaborate with cross-functional teams to enhance user experience.
• Own backend services from design to deployment and monitoring.

Skills

Ruby

Back-End Systems Development

API Development

PostgreSQL

Cloud Infrastructure

Microservices Architecture

Tools

AWS

Docker

Kubernetes

Job 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

• 7–8+ years of experience building and scaling backend systems in production environments
• 4+ years leading Ruby cloud stack teams as a Principal Engineer/Architect
• Genuine Rubyist with deep knowledge of Ruby object model – eigenclasses, method dispatch, method_missing, send, and all variable types
• Expert skills with Ruby idiomatic patterns, terse styling, metaprogramming, and ability to create macros, DSLs, and other domain‑specific abstractions
• Experience contributing to widely used gems or developing internal DSLs for domain‑specific needs
• Ruby without Rails – capable of building complex applications and deciding when to use Rails versus custom Ruby plugins
• Proficiency in building APIs and distributed services using Ruby
• In‑depth knowledge of Rails AREL, performant code, and proper Sidekiq job handling
• Expert knowledge of data‑model design for e‑commerce concerns, including locking sensitive resources such as credit‑card charges and state‑machine concepts
• Expert experience with PostgreSQL, complex joins, reporting queries, and performance optimization
• Familiarity with cloud infrastructure (e.g., AWS, ECS, CodeBuild) and containerization (Docker, Kubernetes)
• Strong understanding of system design, data structures, and algorithmic principles
• 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
• Experience with specific challenges of concurrency, inventory reservation, currency/price management, and third‑party API integration system designs – push, pull, effective normalization, etc.
• High familiarity with microservices software design using DSLs for cloud‑deployed solutions across numerous models, concerns, and integrations
• Experience developing and deploying GraphQL and RESTful API interfaces
• Experience developing multi‑tenant systems, including access control, reporting, and authorization/authentication concerns

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

• 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.