Senior React Engineer (Contract)
Location: London (hybrid)
Day rate: £500–£650 (outside IR35)
Start: ASAP
Duration: 6 months (likely extension)
We’re working with a well-funded, product-led business undergoing a significant evolution of its frontend platform.
This is not a greenfield “build a landing page” role.
This is a core product engineering position, focused on building scalable, high-performance user experiences used daily by customers.
You will be joining a team that values clean architecture, strong engineering standards, and pragmatic delivery.
Contributing to a modern frontend architecture (component-driven, modular, scalable)
Working closely with product, design and backend teams to deliver end-to-end features
Improving performance, reliability and maintainability across the frontend codebase
Writing clean, testable code and contributing to engineering standards across the team
Taking ownership of features from design through to production
What we’re looking for
This role is for hands-on engineers.
You will likely have:
Experience building complex, user-facing applications (not just marketing sites)
Exposure to Next.js or similar modern frameworks
Experience working within component-based architectures or design systems
Solid understanding of API integration (REST or GraphQL)
Experience working in agile, product-led teams
A track record of delivering features in fast-moving environments
Strong bonus
Exposure to CI/CD pipelines and modern deployment practices
Experience in financial services, SaaS, or high-traffic platforms
To save everyone time, this role is not suited to:
Purely agency or marketing website backgrounds
Engineers without recent hands-on React experience
Candidates who are not comfortable owning delivery
Strong engineering environment with modern tooling and practices
Opportunity to shape how the frontend is built going forward
Long-term potential beyond the initial contract
Outside Spy discovers all the Outside IR35 IT contract opportunities for members.