Senior React Developer

We are seeking a Senior React Developer with deep expertise in building sophisticated, high-performance frontend applications. This role is critical to delivering exceptional user experiences and establishing frontend excellence across our product portfolio.

You will be a core contributor on the frontend, mentoring developers, contributing to architectural direction, and ensuring our React applications meet the highest standards of quality, performance, and maintainability. This is a hands-on role for someone who can drive complex frontend initiatives, make critical architectural decisions, and elevate the capabilities of the entire frontend team.

In this role, you will own the development and release of challenging user interfaces - from real-time collaborative features to AI-powered experiences - while ensuring our codebase remains clean, testable, and scalable. You will work closely with designers, backend developers, and product managers to translate ambitious product visions into elegant technical solutions.

This is a role for someone who is passionate about frontend craft, stays current with the React ecosystem, and thrives on building delightful user experiences while mentoring others. You will play a pivotal role in shaping our frontend architecture and building a culture of frontend excellence.

Main Responsibilities

• Own the development of complex React applications with exceptional user experience.

• Design and implement scalable frontend architectures and component libraries.

• Establish and promote frontend best practices, patterns, and coding standards.

• Optimise application performance, including bundle size, rendering, and runtime efficiency.

• Build accessible, responsive, and mobile-friendly user interfaces.

• Mentor mid-level and junior frontend developers, supporting their technical growth.

• Collaborate with designers to create pixel-perfect, intuitive interfaces.

• Work with backend teams to design efficient API contracts and data fetching strategies.

• Own frontend technical decisions and participate in architectural discussions.

• Implement comprehensive testing strategies for frontend applications.

• Extensive experience building production React applications.

• Deep expertise in modern JavaScript/TypeScript and functional programming patterns.

• Strong understanding of React fundamentals

• Proven experience architecting scalable frontend applications and component libraries.

• Expertise in state management solutions (Zustand, Recoil, Redux, or similar).

• Strong proficiency in modern CSS, CSS-in-JS libraries, and responsive design.

• Experience with frontend build tools and module bundlers.

• Comprehensive testing experience (Jest, React Testing Library, Cypress).

• Deep understanding of web performance optimisation techniques.

• Strong grasp of web accessibility standards (WCAG) and semantic HTML.

• Experience with RESTful APIs and modern data fetching patterns.

• Excellent communication skills and ability to articulate technical concepts clearly.

• Proven track record of mentoring and elevating other developers.

Nice to Have

• Understanding of backend technologies and API design.

• Experience with Java backend development (Spring Boot, Spring Framework).

• Experience with Python backend development.

• Experience building AI-powered user interfaces or chat experiences.

• Knowledge of observability and monitoring tools.

• Experience with CI/CD pipelines and Kubernetes deployments.

• Familiarity with micro-frontend architectures.

• Knowledge of frontend security best practices.

• Private Pension Scheme

• BUPA Health and Dental insurance (including access to the My BUPA app)

• Group life assurance: 4x annual salary

• 26 holiday days per calendar year in addition to Bank Holidays

• Cycle to work scheme

• Employee Assistance Program

• Eyecare and Flu Jab vouchers

Board Intelligence is a technology and advisory firm that supercharges boards with the science of board effectiveness. We build better businesses and benefit society. Through a suite of AI-powered software tools, evaluation frameworks, and advisory services that distil twenty years of boardroom experience, we improve the efficiency of board processes and the effectiveness of boards. We work with over 70,000 leaders and 3,000 organisations across the world, with clients across the Fortune 500, FTSE 100, and OMX 30. In 2024 we received substantial backing from K1 Investment Management - the leading B2B Enterprise SaaS investors. We are at the beginning of significant growth, and we're looking for superb talent to join us on this journey. As we grow, we're fiercely protective of our culture and values. Many of us, including our founders, have families and other priorities, so we know the value of a supportive company. The team is diverse and friendly. We value fun: most days you'll find a social event or learning opportunity to get involved with, including company socials, away days, philanthropic activities and lunch & learns. Our Mission We unleash the potential of organisations through the science of board effectiveness, building better businesses and benefiting society.