Senior Front-End Engineer

CoStar GroupLondon, United Kingdomlast year

The role of Senior Front-end Engineer will be a pivotal role within the OTM UX team, reporting to the Director, Residential Technology. The UX team is responsible for the user interface, user experience, and overall performance of the OnTheMarket web apps and iOS / Android apps. This role will be instrumental in delivering a seamless and engaging experience for our users.

This role would be suited to an individual with a deep understanding of React, Redux, and Next.js. The candidate must be able to demonstrate expertise in building scalable and maintainable user interfaces, ensuring high performance and responsiveness across all devices. A strong ability to translate designs and user requirements into high-quality, reusable and maintainable code.

Responsibilities

Develop and maintain user-facing features using React, Redux and Next.js.
Build reusable components and front-end libraries.
Optimise applications for maximum speed and scalability.
Working with the CTO Collaborate with the Head of UX to ensure the technical feasibility of their designs.
JS application reliability including; incident management, performance tuning, monitoring&deployment.
Full workflow with testing frontend applications (unit, integration, or E2E) and advanced Git version control.

Qualifications

Bachelor’s degree in Computer Science, Mathematics, Engineering or equivalent experience
Strong 4+ years commercial experience with JavaScript (ES6/ES7+)
Commercial experience with React and Redux.
Proficient with React features such as hooks, pure components, error handling, HOCs, and lazy loading and hands-on experience with Next.js and Server-Side Rendering (SSR)
Experience integrating and working with APIs, including the fetch() API
Solid understanding of HTTP, semantic HTML, accessibility, and responsive web design across various browsers and devices
Strong CSS skills, including Tailwind, Flexbox, Grid, and modern web layout techniques
Performance-minded, with experience optimizing rendering, load times, and tracking key metrics like Core Web Vitals using tools such as Lighthouse
A good grasp of software design principles

Nice To Have

A good eye for design and attention to UI/UX details
Familiarity with CI/CD pipelines, particularly Jenkins
Experience in applying general SEO concepts
Experience with AWS is a plus
Experience working with the Google Maps API, data visualisations and creating clean, simple and compatible email templates
Familiarity with TypeScript

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FAQ

Is the Senior Front-End Engineer position at CoStar Group remote?: Yes. This role was posted on Remote Backend Jobs, a job board that lists exclusively fully remote positions.
When was this Senior Front-End Engineer job posted?: This listing was posted on August 19, 2025 and is still open for applications.
How do I apply for the Senior Front-End Engineer position at CoStar Group?: Use the apply button on this page — it takes you directly to the employer’s application page.