Senior Frontend Developer

Salary: £? - ? per year

Requirements:

• Expert-level knowledge of React, TypeScript, and modern frontend architectures.
• Strong understanding of React internals, Server Components, and modern React frameworks, including Next.js.
• Deep expertise in state management and data-fetching patterns.
• Proven experience optimising frontend performance and improving Core Web Vitals.
• Strong background in unit, integration, and end-to-end testing.
• Knowledge of accessibility standards, including WCAG 2.1 AA.
• Experience implementing frontend security best practices.
• Strong debugging and monitoring experience using observability tools.
• Experience designing and maintaining CI/CD pipelines and deployment processes.
• Understanding of build optimisation and module bundling techniques.
• Minimum of 5 years commercial experience in frontend engineering or a similar software engineering role.
• Proven track record of delivering complex digital products in agile development environments.
• Strong ownership mentality and accountability for product and system performance.
• Ability to communicate complex technical concepts to technical and non-technical stakeholders.
• Collaborative approach, with experience influencing teams and driving consensus.
• Passion for mentoring and developing other engineers.
• Data-driven decision-making and a pragmatic approach to problem-solving.
• Commitment to inclusive, high-performing team cultures.
• Technology stack includes React, Next.js, TypeScript, React Native, Flutter/Dart, Gatsby, Redux Toolkit, Zustand, MobX, TanStack React Query, SWR, Apollo Client, Tailwind CSS, Styled Components, Material UI, Radix UI, Framer Motion, GraphQL, REST APIs, Contentful CMS, React Hook Form, Zod, Vitest, Jest, Testing Library, Playwright, Storybook, MSW, Axe/Pa11y, AWS, Terraform, GitLab CI, Vercel, OpenTelemetry, Sentry, and New Relic.

Responsibilities:

• Lead the planning and delivery of complex frontend projects, translating ambiguous requirements into clear technical solutions.
• Take end-to-end ownership of critical applications, ensuring reliability, scalability, performance, and maintainability.
• Drive technical decision-making and architecture discussions across the team.
• Balance short-term business priorities with long-term technical health and sustainability.
• Manage technical debt strategically and advocate for continuous improvement initiatives.
• Deliver high-quality, production-ready code that is secure, performant, maintainable, and well-tested.
• Lead incident management and troubleshooting, implementing preventative measures to improve platform stability.
• Design systems with strong observability, scalability, and operational resilience.
• Create and maintain technical documentation, runbooks, and operational processes.
• Mentor and support engineers through coaching, code reviews, and technical guidance.

Technologies:

• AWS
• Apollo
• CI/CD
• CMS
• CSS
• Dart
• Flutter
• Frontend
• Gatsby
• GitLab
• GraphQL
• Incident Management
• Support
• Jest
• Material UI
• OpenTelemetry
• Playwright
• REST
• React
• React Native
• Redux
• Security
• Sentry
• Storybook
• Terraform
• TypeScript
• Web
• UX UI Design
• Cloud
• JavaScript

More:

We are advertising a 6-month contract for a Senior Frontend Developer (React Native), working 40 hours per week inside IR35, with one day per week in our London Farringdon office at 47–53 Charterhouse Street, London, EC1M 6PB. We offer the opportunity to work in a fast-paced engineering environment on complex, high-impact digital products for customers and internal stakeholders, while contributing to technical strategy and engineering practices. Any assignment offer with our client is subject to satisfactory pre-employment checks, including a Disclosure and Barring Service check. We are Rullion Ltd, acting as an employment business. Since 1978, we have supported candidates and clients ranging from large brands to SMEs and start-ups. As a family-owned business, we focus on credible, honest, long-term relationships and are committed to diversity and equal opportunities for employees and applicants.

last updated 41 week of 2026