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

JR United Kingdom; London; Remote; GBP 125,000 - 150,000; Full time

Job summary

A leading tech-driven company is seeking a Senior Backend Engineer Contractor with expertise in Java and Ruby. This fully remote role requires designing scalable systems and collaborating with teams to enhance infrastructure. Ideal candidates will have a freelance mindset and experience with modern backend environments.

Qualifications

• Senior-level backend experience with Java and Python in production systems.
• Proven work with Rust, familiarity with Ruby.

Responsibilities

• Designing and building robust backend services across Java, Python, and Rust.
• Collaborating with teams to scale critical infrastructure.
• Contributing to performance optimisation and clean architecture.

Skills

Java

Python

Rust

Ruby

APIs

Cloud-native systems

Scalable architecture

Job description

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

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Client:

Location:

london (city of london), United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

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Job Views:

4

Posted:

12.05.2025

Expiry Date:

26.06.2025

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Job Description:

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! :)