Staff Full Stack Engineer (Contract) | Rust & Java (Primary) | React & Python (Secondary) | Fully Remote (UK-based) | £500-600+/day | Outside IR35 | 12-Month Contract

Owen Thomas | B Corp™; United States; Remote; GBP 92,000 - 111,000; Part time

Job summary

Owen Thomas | B Corp™ is seeking an experienced Staff Full Stack Engineer for a fully remote, UK-based contract. The role focuses on building scalable backend services in Rust and Java, alongside modern frontend work with React and Python.

You will own features end to end, influence architectural decisions, and work across product and platform teams. The contract is Outside IR35, 12 months, with day rates of £500–£600+.

Qualifications

• Extensive commercial experience as a Senior or Staff-level Full Stack / Backend Engineer.
• Strong backend experience with Rust and/or Java, ideally both.
• Frontend experience with React; backend with Python.
• Knowledge of REST APIs, microservices, and cloud-native architectures.
• Experience designing, building, and maintaining production-grade systems.

Responsibilities

• Design, develop, and optimize scalable backend services using Rust and Java.
• Build high-performance, scalable systems with maintainable architectures.
• Develop modern frontend apps using React.
• Contribute backend APIs and integrations with Python.
• Own complex features end to end from design to production.

Skills

Rust

Java

React

Python

Microservices

Cloud-native

REST APIs

Senior/Staff

Job description

Staff Full Stack Engineer (Contract) | Rust & Java (Primary) | React & Python (Secondary) | Fully Remote (UK-based) | £500-600+/day | Outside IR35 | 12-Month Contract

We’re partnering with a fast-scaling, globally distributed tech business that’s investing heavily in the evolution of its platform – modernising backend services, improving frontend experiences, and setting long-term architectural direction.

They’re looking for a Staff Full Stack Engineer (Contract) with strong commercial experience in Rust and Java, alongside hands-on experience building production-grade applications with React and Python.

This is a high-impact, long-term contract within an experienced, product-focused engineering team, where you'll play a key role in developing scalable backend systems, delivering modern frontend experiences, and influencing architectural decisions.

It’s well suited to an experienced contractor who enjoys owning complex technical challenges, working across the full stack, and building performant, reliable software – supported by modern, AI-assisted development practices.

What You’ll Be Doing as a Staff Full Stack Engineer (Contract) | Rust & Java | React & Python

• Designing, developing, and optimising scalable backend services using Rust and Java
• Building high-performance, reliable systems with a focus on scalability, maintainability, and clean architecture
• Developing and maintaining modern, customer-facing applications using React
• Contributing to backend services, APIs, and integrations using Python
• Taking ownership of complex features end to end, from architectural design through to production delivery
• Working closely with product, design, and platform teams to deliver impactful customer-facing functionality
• Influencing technical direction, engineering standards, and architectural decisions across the platform
• Applying best practices around performance, reliability, testing, and security
• Leveraging AI-assisted development tools for coding, refactoring, testing, and debugging

Core Skills & Experience – Staff Full Stack Engineer (Contract) | Rust & Java | React & Python

• Extensive commercial experience as a Senior or Staff-level Full Stack / Backend Engineer in production environments
• Strong backend engineering experience with Rust and/or Java, ideally with commercial exposure to both
• Solid understanding of concurrent programming, distributed systems, and performance-focused backend development
• Commercial experience developing modern frontend applications using React
• Hands-on experience with Python, including backend services, APIs, or application development
• Strong knowledge of REST APIs, microservices, scalable architecture, and cloud-native development
• Experience designing, building, and maintaining production-grade systems
• Comfortable using AI-assisted development tools as part of your daily engineering workflow
• Contractor mindset: able to onboard quickly, communicate clearly, take ownership, and deliver value fast

Strongly Preferred

• Strong commercial experience across both Rust and Java
• Experience working across the full stack with React and Python
• Previous experience making architectural decisions or providing technical leadership at Staff Engineer level
• Experience building performance-sensitive, highly scalable, or distributed backend systems
• Background working within fast-growing, product-led technology businesses
• Comfortable working across multiple languages, frameworks, and engineering disciplines

Nice to Have

• Experience with Python frameworks such as Django or FastAPI
• Experience with modern React ecosystems, including TypeScript
• Exposure to systems-level programming, asynchronous processing, or high-throughput services
• Experience improving developer experience, internal tooling, or engineering productivity
• Experience mentoring engineers or contributing to wider engineering standards

Contract Details – Staff Full Stack Engineer | Rust & Java (Primary) | React & Python (Secondary) | Fully Remote (EU-based) | £500–600/day | Outside IR35 | 12-Month Contract

• Contract Type: LTD Company (UK) / B2B
• Location: Fully remote (EU-based required for legal and timezone reasons)
• Duration: 12 months, with strong extension potential
• Start Date: ASAP

If you’re an experienced Staff / Senior Full Stack Engineer with strong Rust and Java expertise, alongside commercial React and Python experience, and enjoy building scalable systems while owning features end to end, this is an excellent long-term contract opportunity.