Senior Backend Engineer Contractor (Java, Python, Rust + Ruby nice-to-have) | Fully Remote / EU-Based | Rate £550-650pd, Outside IR35 | 12-months Contract Length

Summary: The Senior Backend Engineer Contractor role is a fully remote position aimed at experienced professionals with expertise in Java and Python, and familiarity with Rust and Ruby. The contractor will be responsible for designing and building robust backend services, collaborating with teams to scale infrastructure, and optimizing performance. This high-impact freelance role offers a competitive daily rate and is classified as outside IR35. The contract is set for a duration of 12 months.

Key Responsibilities:

• 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
• Supporting legacy Ruby codebases or integrations where needed

Key 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

Salary (Rate): 650

City: undetermined

Country: United Kingdom

Working Arrangements: remote

IR35 Status: outside IR35

Seniority Level: Senior

Industry: IT