Senior Frontend developer
| Company: | Rullion |
|---|---|
| Salary: | £650 to £700 a day |
| Hours: | Full-time |
| Location: | City of London, EC1M 6PB |
| Job type: | Contract |
| Posting date: | 7 Oct 2026 |
| Closing date: | 28 Oct 2026 |
Summary
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 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.
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
- Proven expertise with
- Advanced
- Senior-level frontend engineering experience
- Experience working within large-scale frontend applications
- Strong testing background using tools such as
- Ability to work independently while collaborating effectively within agile squads
- Experience troubleshooting and resolving production issues
- Excellent communication and stakeholder management skills
React
Next.js
TypeScript development experience
Playwright,
Jest, and
Vitest
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.
Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.