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: Until the end of 2026 with potential extension
Rate: Up to £650 per day
Working Pattern: Hybrid - 1 day per week on-site in London (Thursdays)
Hours: 40 hours per weekThe 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.
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 maintainabilityTechnology 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 environmentsEssential 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 skillsDesirable 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 teamsWhat 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.
Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants
