Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract at Owen Thomas | Pending B Corp™, United Kingdom, £500-£600 per day

Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract

Opportunity:

We’re engaged by a product-led tech company undergoing a major architectural transformation. After years of rapid growth and feature velocity, the engineering organisation is now modernising its platform to improve scalability, reliability and long-term adaptability.

They are moving from a Ruby monolith toward a modern, service-based ecosystem built in Java, Python and Rust - and they need a senior technical leader to own complex extraction work and guide the transition.

What You’ll Be Doing as a Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract

• Leading feature-by-feature migration out of a legacy Rails monolith
• Designing and delivering new microservices in Java and/or Python (Rust experience a bonus)
• Working with product and engineering teams to map dependencies and define extraction strategy
• Driving delivery end-to-end: design, build, refactor, test, deploy
• Ensuring robust automated testing, integration and e2e coverage (including mobile touchpoints)
• Creating documentation for API specs, architecture, deployment flows and service interactions
• Improving system performance, reliability and observability as services scale
• Helping standardise engineering processes across multiple teams

Core Skills for the Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract

• Advanced commercial experience with Java
• Strong experience with Python or Rust
• Background working with Ruby on Rails in production systems
• Modern frontend experience - React ideally
• REST or GraphQL API experience
• Experience with MySQL/Redis and distributed architecture
• Comfortable leveraging AI/coding agents to accelerate delivery
• Strong communication and technical leadership abilities
• Able to operate independently, or lead small teams to deliver complex work

Details for the Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract

• Contract: Outside IR35 (LTD/B2B)
• Location: Fully Remote (must be UK-based)
• Duration: 12 Months
• Start Date: ASAP
• Daily Rate: £500-600

If you’re interested in this Staff Full Stack Engineer, Java Focused | Some Python, Ruby on Rails, Rust, React is a plus | Remote UK or EU | £500-600/day Outside IR35 | 12-Month Contract