Senior Frontend developer

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