Front End React Developer

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

Job summary

Ascend Consulting in Greater London is seeking a Front End JavaScript Developer proficient in React.js to build scalable UI features and reusable components. You will convert designs into high-quality code and optimize performance across devices and browsers.

The role requires strong JavaScript, TypeScript, Redux, and REST API experience, with familiarity in modern tooling (Babel, Webpack, NPM) and GitHub Actions. Office-based position in North West London.

Qualifications

• Strong proficiency in JavaScript including DOM manipulation and the JavaScript object model.
• Experience with TypeScript is essential and knowledge of React.js core principles.
• Familiarity with Redux and RTK (RTKQuery bonus).
• Knowledge of RESTful APIs and modern authorization mechanisms like JSON Web Token.
• Familiarity with front-end build pipelines and tools, including GitHub Actions; Babel, Webpack, and NPM are a plus.
• Ability to translate business requirements into technical tasks and to benchmark and optimize code.
• Experience with React Native is a bonus.

Responsibilities

• Develop user-facing features using React.js.
• Build reusable components and front-end libraries for future use.
• Translate designs and wireframes into high-quality code and optimize components for performance across devices and browsers.
• Collaborate with the team across different infrastructure layers to deliver a quality product.

Skills

React

JavaScript

TypeScript

Redux

RTK

REST APIs

JWT

GitHub Actions

Babel

Webpack

NPM

React Native

Benchmarking

Problem-solving

Tools

Babel

GitHub

JSON

JavaScript

NPM

REST

React

React Native

Redux

TypeScript

Webpack

Web

Git

Frontend

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 33 week of 2026