Senior Frontend Engineer - React & React Native Lead

Rullion; Greater London; Hybrid; GBP 96,432,000 - 151,536,000; Full time

Job summary

Rullion is seeking a Senior Frontend Developer (React Native) to lead complex frontend initiatives in a fast-paced engineering environment in London. You will own critical frontend systems, mentor engineers, and drive technical strategy while balancing performance and maintainability.

The role offers a 6-month contract with hybrid work (1 office day) based in London, Farringdon. You will work on scalable, production-ready code, improve CWV, and contribute to best practices across the team.

Qualifications

• Minimum 5 years' commercial experience in frontend engineering or a similar software role.
• Expert-level knowledge of React, TypeScript and modern frontend architectures.
• Experience optimising frontend performance and improving Core Web Vitals.

Responsibilities

• Lead the planning and delivery of complex frontend projects, translating requirements into technical solutions.
• Take end-to-end ownership of critical applications, ensuring reliability, scalability and maintainability.
• Drive architecture discussions and balance business value with technical health.

Skills

React

TypeScript

React Native

Performance optimization

Testing

Accessibility WCAG 2.1 AA

Security practices

Observability

CI/CD pipelines

Build optimisation

Tools

AWS

Terraform

GitLab CI

Vercel

OpenTelemetry

Sentry

New Relic

Job description

Rullion is seeking a Senior Frontend Developer (React Native) to lead complex frontend initiatives in a fast-paced engineering environment in London. You will own critical frontend systems, mentor engineers, and drive technical strategy while balancing performance and maintainability.

The role offers a 6-month contract with hybrid work (1 office day) based in London, Farringdon. You will work on scalable, production-ready code, improve CWV, and contribute to best practices across the team.