Senior Backend Engineer Contractor (Java, Python, Rust + Ruby nice-to-have) | Fully Remote / EU[...]

Owen Thomas | Pending B Corp™; United Kingdom; On-site; GBP 101,475 - 119,925; Full time

Job summary

An innovative firm is seeking a Senior Backend Engineer Contractor to join their dynamic team. This fully remote role requires deep expertise in Java and Python, with strong experience in Rust and a willingness to support legacy Ruby codebases. You'll design and build robust backend services while collaborating with product and platform teams to enhance critical infrastructure. This is an exciting opportunity to contribute to high-impact projects in a tech-driven environment, where your skills will help shape scalable systems and optimize performance. If you're ready to make an impact quickly, this role is for you.

Qualifications

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

Responsibilities

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

Skills

Java

Python

Rust

Ruby

APIs

Cloud-native systems

Scalable architecture

Job description

Senior Backend Engineer Contractor (Java, Python, Rust + Ruby nice-to-have) | 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 Python, strong exposure to Rust, and ideally a touch of 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:

• 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:

• 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:

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

If interested, please apply here and we will contact you if it's a good match! :)

Seniority level

Mid-Senior level

Employment type

Contract

Job function

Engineering and Information Technology

Industries

Technology, Information and Media