Senior JavaScript Developer in London
Senior JavaScript Developer

Senior JavaScript Developer in London

London Full-Time 60000 - 80000 £ / year (est.) Home office (partial)
Monterosa

At a Glance

  • Tasks: Design and develop engaging user interfaces using React and modern front-end technologies.
  • Company: Join Monterosa, a leader in innovative digital experiences for media and entertainment.
  • Benefits: Competitive salary, flexible working options, and opportunities for professional growth.
  • Other info: Collaborative environment with a focus on continuous learning and innovation.
  • Why this job: Be part of a creative team that shapes the future of entertainment through technology.
  • Qualifications: Expertise in React, TypeScript, and a passion for high-performance web applications.

The predicted salary is between 60000 - 80000 £ per year.

At Monterosa, we are passionate about bringing people together through engaging and interactive experiences in entertainment and sport. Our mission is to enhance popular culture by delivering innovative solutions for some of the world's most beloved brands in media, sports, and entertainment. We strive to inspire and empower organisations to connect with their audiences in meaningful ways.

As a Front-End Engineer at Monterosa, you will be responsible for developing innovative and engaging user interfaces for our digital products, ensuring they align with Monterosa's overall goals. You will utilise your expertise in front-end technologies, responsive design, and advanced tooling to create high-quality, user-centric experiences.

Key responsibilities
  • User Interface Development: Designing and developing intuitive, responsive user interfaces using React and other front-end technologies. Ensure that the UI meets design specifications, is visually appealing, and provides an optimal user experience across various devices and screen sizes.
  • Integration with Backend Services: Collaborating with backend engineers to integrate front-end interfaces with backend APIs for data communication, authentication, and error handling. Ensure seamless interaction between the front-end and back-end components to deliver a cohesive user experience.
  • Performance Optimisation: Implementing performance optimisation techniques such as code splitting, lazy loading, caching, and network optimisation to improve the speed and efficiency of front-end applications. Profile and analyse performance bottlenecks to identify areas for improvement and enhance overall responsiveness.
  • Code Quality and Maintenance: Writing clean, maintainable code according to industry best practices and coding standards. Regularly refactor and optimise existing codebase to improve readability, scalability, and maintainability. Conduct code reviews and collaborate with team members to ensure code quality and consistency.
  • Continuous Learning and Innovation: Stay updated with the latest front-end technologies, trends, and best practices. Experiment with new tools and techniques to innovate and enhance the front-end development process. Share knowledge and mentor junior team members to foster a culture of continuous learning and improvement.
About you

You are a seasoned Frontend Developer with expertise in React.js, TypeScript, and modern frontend technologies. You have a strong eye for detail and a passion for building high-performance, scalable, and maintainable web applications. You have experience with testing frameworks like Jest, React Testing Library, or Cypress, ensuring code quality and stability. Knowledge of CI/CD pipelines, Git workflows, and containerisation with Docker is a plus. You enjoy collaborating with designers, backend developers, and stakeholders to bring seamless digital experiences to life.

Qualifications:
  • Core React & Frontend Development: Strong understanding of React fundamentals, including JSX, Virtual DOM, and component-based architecture. Experience with responsive design techniques and tools to ensure optimal user experiences across different devices. Proficiency in HTML5, CSS3 (Flexbox, Grid), and modern CSS frameworks (e.g. Tailwind CSS, Styled Components, Material UI).
  • JavaScript & TypeScript Expertise: Mastery of advanced JavaScript (ES6+) concepts, including async/await, promises, closures, and functional programming. Hands-on experience with TypeScript for type safety and scalable frontend architecture.
  • State Management & API Integration: Deep knowledge of React state management solutions like Redux, Redux-Saga, Zustand, or React Query. Experience integrating and handling RESTful APIs and GraphQL, including authentication, error handling, and security considerations.
  • Performance Optimisation & Tooling: Expertise in frontend performance optimisation techniques, including code splitting, lazy loading, memoisation, and caching. Familiarity with Webpack, ESLint, Prettier, Vite, or ESBuild to enhance development workflows. Understanding of browser security constraints, accessibility (WCAG standards), and best practices for frontend security (XSS, CSRF, CORS, SQL Injection protection).
  • Debugging & Profiling: Advanced experience with browser developer tools, Chrome DevTools, Lighthouse, and performance monitoring tools to analyse memory usage, CPU performance, and network activity. Ability to diagnose and resolve frontend performance bottlenecks efficiently.

Do you want to join our team as our new Senior Front-End Engineer? Then we'd love to hear from you!

Senior JavaScript Developer in London employer: Monterosa

At Monterosa, we pride ourselves on fostering a dynamic and inclusive work culture that encourages creativity and collaboration. As a Senior JavaScript Developer, you will have access to continuous learning opportunities and the chance to work on innovative projects that shape the future of entertainment and sport. With locations in vibrant cities like Accra, Liverpool, London, and Warsaw, we offer a unique environment where your contributions are valued, and your professional growth is supported.
Monterosa

Contact Detail:

Monterosa Recruiting Team

StudySmarter Expert Advice 🤫

We think this is how you could land Senior JavaScript Developer in London

✨Tip Number 1

Network like a pro! Attend meetups, tech conferences, or local events where you can connect with other developers and industry professionals. You never know who might be looking for someone with your skills!

✨Tip Number 2

Show off your work! Create a portfolio showcasing your best projects, especially those using React and TypeScript. Make sure to include links to live demos and GitHub repositories so potential employers can see your code in action.

✨Tip Number 3

Prepare for interviews by brushing up on your technical skills and common interview questions. Practice coding challenges and be ready to discuss your past projects and how you tackled specific problems.

✨Tip Number 4

Don't forget to apply through our website! It’s the best way to ensure your application gets seen by the right people at Monterosa. Plus, it shows you're genuinely interested in joining our team!

We think you need these skills to ace Senior JavaScript Developer in London

React.js
TypeScript
HTML5
CSS3
JavaScript (ES6+)
Responsive Design
State Management (Redux, Redux-Saga, Zustand, React Query)
API Integration (RESTful APIs, GraphQL)
Performance Optimisation (code splitting, lazy loading, caching)
Testing Frameworks (Jest, React Testing Library, Cypress)
CI/CD Pipelines
Git Workflows
Containerisation (Docker)
Frontend Security Best Practices (XSS, CSRF, CORS, SQL Injection protection)
Debugging and Profiling Tools (Chrome DevTools, Lighthouse)

Some tips for your application 🫡

Tailor Your CV: Make sure your CV is tailored to the Senior JavaScript Developer role. Highlight your experience with React, TypeScript, and any relevant projects that showcase your skills in front-end development.

Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Share your passion for frontend development and how your skills align with Monterosa's mission. Don’t forget to mention any innovative solutions you've implemented in past roles.

Showcase Your Projects: Include links to your GitHub or portfolio where we can see your work in action. Demonstrating your coding style and problem-solving abilities through real projects can really set you apart from other candidates.

Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates regarding your application status.

How to prepare for a job interview at Monterosa

✨Know Your Tech Stack

Make sure you’re well-versed in React, TypeScript, and the other technologies mentioned in the job description. Brush up on advanced JavaScript concepts and be ready to discuss how you've used them in past projects.

✨Showcase Your Projects

Prepare to talk about your previous work, especially any user interfaces you've developed. Bring examples that highlight your skills in responsive design and performance optimisation, and be ready to explain your thought process behind each project.

✨Collaborate Like a Pro

Since collaboration is key, think of examples where you've worked with backend engineers or designers. Be prepared to discuss how you’ve integrated front-end interfaces with backend services and how you handle communication in a team setting.

✨Stay Updated and Curious

Demonstrate your passion for continuous learning by discussing the latest trends in front-end development. Mention any new tools or techniques you’ve experimented with recently, and express your eagerness to share knowledge and mentor others.

Senior JavaScript Developer in London
Monterosa
Location: London

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