Senior Ruby Engineer

Hulcan; Greater London; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Career growth opportunities

Collaborative work environment

Innovative culture

Job summary

Hulcan is seeking a Principal Engineer/Architect to design and implement high-performance backend systems for our e-commerce platform. The ideal candidate will have over 8 years of experience in backend development, with a strong focus on Ruby and cloud infrastructure.

This role involves mentoring junior engineers and collaborating with cross-functional teams to elevate user experience and drive technical excellence.

Join us to shape the future of a luxury tech brand in a dynamic and innovative environment.

Qualifications

• 8+ years of experience building and scaling backend systems in production environments.
• 4+ years leading Ruby cloud stack teams as a Principal Engineer/Architect.
• Expert skills with Ruby idiomatic patterns and metaprogramming.
• Proficiency in building APIs and distributed services using Ruby.

Responsibilities

• Design and implement scalable backend systems for e-commerce.
• Collaborate with product, design, and data teams.
• Own backend services end-to-end, from design to deployment.
• Mentor junior engineers and foster technical excellence.

Skills

Ruby development

Backend architecture

Performance optimization

API development

PostgreSQL expertise

Cloud infrastructure

System design

Collaboration

Tools

PostgreSQL

Docker

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

• 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.

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.