Senior Frontend Developer

Rullion Managed Services

Greater London

Hybrid

GBP 9,643,000 - 13,776,000

Full time

35 hours ago

Be an early applicant

Application generator

Don’t send a generic resume — generate a resume and cover letter tailored to this exact role.

Get past ATS filters

Job summary

Rullion Managed Services is seeking a Senior Frontend Developer (React Native) to lead complex frontend projects from London. The role requires hands-on architecture guidance, mentoring, and a track record of delivering scalable digital products in agile settings.

You will own critical frontend systems, drive performance improvements, and maintain best practices across testing, accessibility and security. Hybrid work with one office day in London.

Qualifications

Minimum 5 years' commercial experience in frontend engineering or a similar software engineering role.
Lead the planning and delivery of complex frontend projects, translating ambiguous requirements into clear technical solutions.
Take end-to-end ownership of critical applications, ensuring reliability, scalability, performance and maintainability.
Mentor and support engineers through coaching, code reviews and technical guidance.

Responsibilities

Lead the planning and delivery of complex frontend projects, translating ambiguous requirements into clear technical solutions.
Take end-to-end ownership of critical applications, ensuring reliability, scalability, performance, and maintainability.
Drive technical decision-making and architecture discussions across the team.
Balance short-term business priorities with long-term technical health and sustainability.
Deliver high-quality, production-ready code that is secure and well-tested.
Mentor and support engineers through coaching and code reviews.

Skills

React

TypeScript

Frontend architecture

Server Components

State management

Performance optimization

Testing

Accessibility

CI/CD

Security best practices

Tools

React Native

Redux Toolkit

Zustand

MobX

Tailwind CSS

MUI

Framer Motion

GraphQL

Job description

Senior Frontend Developer (React Native)

6 Month contract

40 hours per week

Inside IR35

Hybrid 1 office day

London Farringdon office address: 47-53 Charterhouse St, London, EC1M 6PB

About the Role

We are looking for a highly experienced Senior Frontend Engineer to join a fast-paced and innovative engineering environment, helping to build and scale next-generation digital products and customer experiences. This is an opportunity to work on complex, high-impact applications used by both customers and internal stakeholders, while influencing technical strategy and engineering best practices.

As a senior member of the engineering team, you will take ownership of critical frontend systems, mentor engineers across multiple levels, and drive technical decisions that balance business value with long-term maintainability.

Key Responsibilities

Lead the planning and delivery of complex frontend projects, translating ambiguous requirements into clear technical solutions.
Take end-to-end ownership of critical applications, ensuring reliability, scalability, performance, and maintainability.
Drive technical decision-making and architecture discussions across the team.
Balance short-term business priorities with long-term technical health and sustainability.
Manage technical debt strategically and advocate for continuous improvement initiatives.
Deliver high-quality, production-ready code that is secure, performant, maintainable, and well-tested.
Lead incident management and troubleshooting activities, implementing preventative measures to improve platform stability.
Design systems with strong observability, scalability, and operational resilience.
Create and maintain technical documentation, runbooks, and operational processes.
Mentor and support engineers through coaching, code reviews, and technical guidance.

Required Skills & Experience

Technical Skills

Expert-level knowledge of React, TypeScript, and modern frontend architectures.
Strong understanding of React internals, Server Components, and modern React frameworks including js.
Deep expertise in state management and data-fetching patterns.
Proven experience optimising frontend performance and improving Core Web Vitals.
Strong testing background across unit, integration, and end-to-end testing frameworks.
Knowledge of accessibility standards, including WCAG 2.1 AA.
Experience implementing frontend security best practices.
Strong debugging and monitoring experience using observability tools.
Experience designing and maintaining CI/CD pipelines and deployment processes.
Understanding of build optimisation and module bundling techniques.

Experience

Minimum 5 years' commercial experience in frontend engineering or a similar software engineering role.
Proven track record of delivering complex digital products within agile development environments.

Desired Behaviours

Strong ownership mentality and accountability for product and system performance.
Ability to communicate complex technical concepts to both technical and non-technical stakeholders.
Collaborative approach with experience influencing teams and driving consensus.
Passion for mentoring and developing other engineers.
Data-driven decision-making and a pragmatic approach to problem solving.
Commitment to inclusive, high-performing team cultures.

Technology Stack

Frontend