Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-[...]

Owen Thomas | Pending B Corp™; United Kingdom; Remote; GBP 80,000 - 100,000; Full time

Job summary

Owen Thomas is seeking a Senior Backend Engineer Contractor focused on Java and Ruby for a fully remote role. The successful candidate will have substantial experience building scalable systems and will play a crucial role within a tech-driven team. This position involves designing robust backend services and collaborating on critical infrastructure projects.

Qualifications

• Senior-level backend experience with both Java and Python in production systems.
• Proven work with Rust preferred.
• Familiarity with Ruby or willingness to support legacy codebases.

Responsibilities

• Designing and building robust backend services across Java, Python, and Rust.
• Collaborating to scale critical infrastructure.
• Contributing to performance optimisation and secure coding.

Skills

Java

Python

Ruby

Rust

APIs

Cloud-native systems

Scalable architecture

Job description

Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd, Outside IR35 | 12-months Contract Length

Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd, Outside IR35 | 12-months Contract Length

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Co-Founder @ Owen Thomas - Pending B Corp | Scaling teams for all things Software, Data, Cloud & AI/ML

Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd, Outside IR35 | 12-months Contract Length

We're supporting a fast-moving client at huge global scale, that is in need of a Senior Backend Contractor with deep experience across Java and Ruby. This is a high-impact freelance role within a tech-driven established team - building scalable systems in a modern backend environment.

What You'll Be Doing as a Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd | Outside IR35 :

• Designing and building robust backend services across Java, Python, and Rust-based systems
• Collaborating with product and platform teams to scale critical infrastructure
• Contributing to performance optimisation, secure coding, and clean architecture decisions
• Bringing in best practices across multiple programming paradigms and languages
• Ideally, supporting legacy Ruby codebases or integrations where needed

Core Skills for the Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd | Outside IR35 :

• Senior-level backend experience with both Java and Python in production systems
• Proven work with Rust (production experience strongly preferred)
• Familiarity with Ruby or willingness to support legacy pieces if required
• Strong grasp of APIs, cloud-native systems, and scalable architecture
• Freelance mindset: able to hit the ground running, communicate clearly, and add value fast

Details for the Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd | Outside IR35

• Contract: LTD company (UK) / B2B
• Location: Remote (must be EU-based for legal/timezone reasons)
• Start: ASAP

If interested in this Senior Backend Engineer Contractor (Java / Ruby focused) | Fully Remote / EU-Based | Rate £550-650pd | Outside IR35, please apply here and we will contact you if it's a good match! :)

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Contract

Job function

• Job function

  Engineering and Information Technology

• Industries

  Technology, Information and Media

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