Rullion
React Developer
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Senior Frontend Developer (Contract)
Overview
We are looking for a talented Senior Frontend Developer to join a high-performing engineering team working on business-critical customer and colleague applications. This is an opportunity to contribute to modern web applications, deliver impactful features, and help drive the evolution of frontend platforms in a collaborative and fast-paced environment.
You'll work closely with designers, backend engineers, product teams, and platform specialists to build scalable, maintainable, and high-quality solutions using modern frontend technologies.
Contract Details
- Role: Senior Frontend Developer
- Contract Type: Inside IR35
- Start Date: ASAP (flexible for the right candidate)
- Duration: 6 Months possibility to extend
- Rate: Up to £650 per day
- Working Pattern: Hybrid – 1 day per week on-site in London (Thursdays)
- Hours: 40 hours per week
The Role
You will primarily work on an established telephony platform used by customer-facing teams to manage inbound and outbound communications. The role involves delivering new features, supporting existing functionality, and helping modernise frontend systems as part of ongoing platform transformation projects.
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Responsibilities include:
- Taking ownership of frontend feature delivery from design through to production
- Building and maintaining React and Next.js applications
- Developing clean, scalable, and well-tested TypeScript code
- Supporting the migration and modernisation of existing frontend platforms
- Working with shared component libraries and design systems
- Debugging production issues and improving application performance
- Contributing to CI/CD processes and deployment pipelines
- Participating in code reviews and mentoring less experienced developers
- Collaborating with Product, Design, Backend, and Platform teams
- Making pragmatic technical decisions that balance delivery, quality, and maintainability
Technology Stack
- React
- Next.js (App Router)
- TypeScript
- Tailwind CSS
- Component Design Systems
- Playwright
- Jest
- Vitest
- Git-based CI/CD pipelines
- Monitoring and observability tools
- Cloud-based infrastructure environments
Essential Skills & Experience
- Strong commercial experience with React
- Proven expertise with Next.js
- Advanced TypeScript development experience
- Senior-level frontend engineering experience
- Experience working within large-scale frontend applications
- Strong testing background using tools such as Playwright, Jest, and Vitest
- Ability to work independently while collaborating effectively within agile squads
- Experience troubleshooting and resolving production issues
- Excellent communication and stakeholder management skills
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Desirable Experience
- Experience with telephony or contact-centre applications
- Knowledge of Twilio integrations
- Experience working with design systems and component libraries
- Exposure to cloud-native environments and modern DevOps practices
- Previous experience mentoring developers and supporting technical growth within teams
What We're Looking For
We're seeking a senior engineer who enjoys solving complex frontend challenges, delivering high-quality customer-focused solutions, and working within a collaborative engineering culture. You'll be comfortable owning features end-to-end, contributing to technical discussions, and helping shape the future direction of modern web applications.
This role would suit someone who combines strong technical expertise with a practical, delivery-focused mindset and a passion for building exceptional user experiences.
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