Front End React Developer

Ascend Consulting; City Of London; On-site; GBP 35,000 - 55,000; Full time

Job summary

Ascend Consulting in the United Kingdom is seeking a Front End JavaScript Developer with strong React.js and TypeScript skills to join our team. You will build reusable UI components, implement pixel-perfect designs, and optimize front-end performance across devices and browsers.

The ideal candidate has deep JavaScript knowledge, Redux/RTK experience, REST APIs, and modern build tools such as Babel, Webpack, NPM, and GitHub Actions. This on-site role is based in North West London.

Qualifications

• Proficiency in React.js and JavaScript; TypeScript essential.
• Experience with Redux/RTK and RTKQuery bonus.
• Familiarity with RESTful APIs and JSON Web Tokens for auth.
• Knowledge of front-end build pipelines and tools (GitHub Actions, Babel, Webpack, NPM).

Responsibilities

• Develop user-facing features with React.js and build reusable components; translate designs into high-quality code; optimize performance across devices and browsers; collaborate with the team on infrastructure.

Skills

React.js

JavaScript

TypeScript

Redux

RTK

REST APIs

JWT

Responsive design

Tools

Babel

Webpack

NPM

GitHub Actions

Git

React Native

Job description

Salary: £35,000 - 55,000 per year

Requirements:

• We are looking for a Front End JavaScript Developer who is proficient in React.js. You should have strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model. Experience with TypeScript is essential, as well as a thorough understanding of React.js and its core principles. Familiarity with Redux and RTK (with RTKQuery being a bonus) is required. You should also be knowledgeable about RESTful APIs and modern authorization mechanisms, such as JSON Web Token. Familiarity with modern front-end build pipelines and tools, including GitHub actions, is a plus. Additionally, experience with common front-end development tools like Babel, Webpack, and NPM is needed. You must have the capability to understand business requirements and translate them into technical requirements, along with a knack for benchmarking and optimization. Experience with React Native is a bonus.

Responsibilities:

• In this role, your primary focus will be on developing user-facing features utilizing React.js. You will be responsible for building reusable components and front-end libraries for future use. You will also translate designs and wireframes into high-quality code and optimize components for maximum performance across a wide array of web-capable devices and browsers. Collaboration with the rest of the team working on different layers of the infrastructure is essential, as we are committed to problem-solving, sophisticated design, and delivering a quality product.

Technologies:

• Babel
• GitHub
• JSON
• JavaScript
• NPM
• REST
• React
• React Native
• Redux
• TypeScript
• Webpack
• Web
• Git
• Frontend

More:

This position is office-based in North West London, and the salary for this role is up to £65K. If you are passionate about creating robust and maintainable user interface components and enjoy working in a collaborative environment, we would love to hear from you.

last updated 36 week of 2026