18 Intermediate React Developer React Js Javascript jobs in London

Senior Front End Developer (JavaScript Angular 18 SaaS) Reigate / WFH to £95k

Are you a senior Front End Engineer with strong JavaScript and Angular skills?

You could be progressing your career in a hands-on leadership role at a global FinTech with flexible working and a range of perks and benefits including continual professional development.

As a Senior Front End Developer you'll be working on a ne.

WHJS1_UKTJ

We have a current opportunity for a C# Fixed Income Developer on a permanent basis. The position will be based in London. For further information about this position please apply.

To find out more about Huxley, please visit (url removed)

Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales

Location : Central London / Hybrid

Duration : 3 Months (Paid internship)

Start Date : 04.08.2025

About Low Carbon

Low Carbon is a purpose-driven company that creates large-scale renewable energy in the global fight against climate change. Our mission is to protect the planet for future generations while delivering positive returns for our communities and investors. Our goal is to produce as much new renewable energy as possible while limiting our own environmental impact. We do this by developing, investing in, and operating large-scale renewable energy projects across the globe.

Our people and culture are really important to us. We are friendly, approachable, and professional. We value enthusiasm, entrepreneurialism, clear communication, and drive. This, combined with our purpose and passion for climate change, is why our colleagues recommend Low Carbon as a great place to work.

About the Role

We’re looking for a motivated Front-End Developer Intern to join our team for a 3-month paid internship. You’ll play a hands-on role in developing a core product in the Renewable Power industry, with a strong focus on building out our internal design system using React and Material UI.

This is an exciting opportunity to gain real-world experience in a collaborative and supportive environment, working alongside an experienced team in an agile workflow.

What you’ll be Doing:

• Building user interfaces for a new product used in the renewable energy sector.
• Helping to develop and maintain our internal design system for consistent UI/UX across the platform.
• Working with React and Material UI components to create clean, responsive front-end code.
• Contributing to data visualization features, helping users make sense of complex datasets.
• Supporting and learning about unit, integration, and smoke testing, and contributing to User Acceptance Testing (UAT) processes to ensure quality and usability.
• Gaining hands-on experience working with CI/CD pipelines within Azure DevOps to streamline development and deployment workflows.
• Participating in agile workflows, code reviews, and product discussions with a cross-functional team.
• Learning and growing with the support of experienced developers and product professionals.

What we’re looking for:

• Familiarity with React and modern JavaScript (ES6+).
• An eye for design and a willingness to work with design systems and component libraries like Material UI.
• Interest or experience in data visualization tools or techniques (e.g. charts, dashboards).
• A passion for clean code, quick decisions, continuous learning, and the renewable energy space.
• Strong communication skills and a team-first, pragmatic attitude.

What you’ll gain:

• Practical experience shipping real features in a production environment.
• Exposure to product development in the clean tech / renewable energy industry.
• Mentorship and feedback from experienced professionals across design, product, and engineering.
• A chance to work on meaningful technology that contributes to a more sustainable future.

Our process:

• Candidates will be asked to complete a React JS assessment online using Coderbyte
• A shortlist of candidates will then be invited for a video interview using MS Teams
• The finalist(s) will then be invited to the Low Carbon office in London for a face to face interview

Please note, this is an internship aligned to a specific project and will not become a permanent post. We are unable to sponsor international candidates for this position.

About Eventogy:

NO AGENCIES - Please do not attempt to canvas from here

Eventogy is a leading event management platform that caters to large corporate enterprise businesses, such as banks, law firms, and government bodies. We specialise in providing event management solutions for highly regulated industries, with a strong focus on security and compliance. As a design-first organisation, we are currently undertaking a complete rebuild of our platform to create an even more intuitive and engaging user experience.

We are seeking a skilled Javascript Developer to join our team and play a crucial role in implementing our redesigned platform. The successful candidate will work closely with our design and development teams to create pixel perfect and highly functional web applications, ensuring an exceptional user experience.

Responsibilities:

1. Collaborate with UX/UI designers and back-end developers to create visually appealing, user-friendly, and highly functional and responsive web applications.
2. Convert designs and wireframes into high-quality HTML, CSS, and JavaScript code.
3. Optimize applications for maximum speed, scalability, and responsiveness.
4. Ensure consistent implementation of brand and design guidelines across all platforms.
5. Develop and maintain reusable code and libraries for future use.
6. Stay up-to-date with the latest front end development technologies and best practices.
7. Conduct thorough testing and debugging to ensure the seamless functioning of applications.
8. Collaborate with cross-functional teams, including product managers, developers, and stakeholders, to define and implement innovative solutions for the product direction, visuals, and user experience.

Requirements

1. A Bachelor's degree in Computer Science, Web Development, or a related field.
2. A minimum of 3 years of experience as a Front End Developer, preferably in the event management or technology sector.
3. Proficient understanding of web markup, including HTML5, CSS3, and JavaScript.
4. Experience building NextJS Web Applications using Typescript.
5. Familiarity with TailwindCSS.
6. Experience with responsive and adaptive design, as well as an understanding of the technical limitations and constraints of web applications.
7. Strong understanding of cross-browser compatibility issues and ways to work around them.
8. Knowledge of code versioning tools, such as Git.
9. Excellent problem-solving skills and a keen eye for detail.
10. Strong communication and teamwork skills, with the ability to work effectively with cross-functional teams.

Benefits

All applicants MUST have working Visas or be UK residents and be currently present in the UK.

This is a hybrid role and we can negotiate the terms of your office presence, but for your information, we currently come in 2-3 times a week to the Farringdon office in London.

We have the finest coffee shop on our doorstep. A food market right in front of the office. Access to gym membership, with conditions! Training is catered for as and when needed. Pret coffee subscription included

NO AGENCIES - Please do not attempt to canvas from here.

Salary: from £50,000 subject to qualification.

Front End React Developer, React, Javascript, NW London to £80K

A leading financial software company  are looking for a  Front End JavaScript developer who is proficient with React.js. The role is Offcie based in North West London, Your primary focus will be on developing user interface components and implementing them following well-known React.js workflows, specifically Redux and RTK. You will ensure that these components and the overall application are robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important.

Responsibilities

• Developing new user-facing features using React.js
li>Building reusable components and front-end libraries for future use
• Translating designs and wireframes into high quality code
• Optimising components for maximum performance across a vast array of web-capable devices and browsers

Skills

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• Experience developing with typescript
• Thorough understanding of React.js and its core principles
• Experience with Redux and RTK (RTKQuery also a bonus)
• Familiarity with RESTful APIs
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Familiarity with modern front-end build pipelines and tools (Github actions a bonus)
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
• Ability to understand business requirements and translate them into technical requirements
• A knack for benchmarking and optimization
• Familiarity with git
• Experience with React Native is a bonus

***THIS ROLE IS OFFICE BASED***

Front End React Developer, React, Javascript, NW London to £80K

A leading financial software company  are looking for a  Front End JavaScript developer who is proficient with React.js. The role is Offcie based in North West London, Your primary focus will be on developing user interface components and implementing them following well-known React.js workflows, specifically Redux and RTK. You will ensure that these components and the overall application are robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important.

Responsibilities

• Developing new user-facing features using React.js
li>Building reusable components and front-end libraries for future use
• Translating designs and wireframes into high quality code
• Optimising components for maximum performance across a vast array of web-capable devices and browsers

Skills

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• Experience developing with typescript
• Thorough understanding of React.js and its core principles
• Experience with Redux and RTK (RTKQuery also a bonus)
• Familiarity with RESTful APIs
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Familiarity with modern front-end build pipelines and tools (Github actions a bonus)
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
• Ability to understand business requirements and translate them into technical requirements
• A knack for benchmarking and optimization
• Familiarity with git
• Experience with React Native is a bonus

***THIS ROLE IS OFFICE BASED***

JOB SUMMARY

We are looking for a highly motivated Senior Vue.js Developer to join our team.  You will be responsible for evolving and scaling our existing platforms as well as working on new greenfield projects. Mentoring other developers, practising excellent communication and motivation within the team is essential. There is a lot of scope for responsibility and the individual should be comfortable taking ownership of and managing all aspects of the front-end stack. You will join a team of front-end, back-end and database developers to deliver modern Progressive-Web-Applications, Applications and Websites.

ESSENTIAL DUTIES

• Evolving and scaling our existing platforms with informed technical decisions.
• Conceptualizing and developing new, stimulating user-facing features.
• Creating reusable libraries and efficient code for broader team use in future projects.
• Prioritizing the optimization of applications for optimal speed and scalability.
• Managing Pull Requests in alignment with the team's workflow, ensuring project expectations and deadlines are met.
• Refining internal processes to enhance the performance, reliability, and usability of our platforms.
• Identifying and making improvements to any performance-related issues affecting our web and mobile-based applications.
• Upholding stringent security standards for web and mobile applications, promptly resolving and protecting against vulnerabilities.
• Staying in tune with innovations and advancements in JavaScript and applying them to keep our applications highly competitive and adept.
• Mentoring team members in a supportive environment to further their growth and understanding of JavaScript's core concepts and best practices.
• Fostering an atmosphere for innovation and positivity, inspiring team members to deliver their best work consistently.

Requirements

Essential Skills

• Strong understanding of the following technologies:
• ES6 & JavaScript
• Vue.js
• Web markup, including HTML & CSS
• Asynchronous request handling using the likes of REST or GraphQL
• Front-end build tools, such as Vite, Webpack and CLIs
• Git and its related platforms like Github or Gitlabs
• Package management using npm
• Browser rendering behaviour and performance
• Passion for writing quality, high-performance and maintainable code following best practices

Desirable Skills

• Typescript
• Nuxt.js
• Node.js
• Storybook
• CI/CD, Pipeline management, GitHub Actions
• Docker
• Prototyping/Storyboarding
• Graphics editing with the likes of Figma, Photoshop & Illustrator
• Mobile & Responsive design
• Testing tools like Vitest, Jest, Playwright, Cypress

 KEY DELIVERABLES

• Leverage advanced JavaScript techniques to develop high-quality, efficient code, assess coding opportunities, conduct robust code reviews, streamlining codebase, and prototypes to continuously improve performance and user experience. Accurately estimate the timescales for design, development and testing phases to ensure realistic and effective project scheduling.
• Evaluate the potential impact of each change request, proactively communicating any associated risks to project managers and the leadership team.
• Collaborate proactively with the development team to coordinate the seamless delivery of high-quality application code.

• REQUIRED EXPERIENCE / QUALIFICATIONS
• IT professional with 5 years of design and technical background and knowledge
• Proven experience in web design and development
• Analytical and problem-solving skills
• Self-motivated and able to work/travel independently
• Proactive, able to work with a high level of responsibility and autonomy, able to work under pressure
• Flexible in terms of working time with a priority on “getting the job done”
• A good team player who can perform and work on a wide variety of tasks simultaneously

COMPETENCIES/SKILLS

Technical Skills

• Advanced JavaScript expertise
• Empowered decision making
• Strong oral and written communication skills
• Cultivates teamwork and collaboration
• Effective allocation and management of resources

Personal Effectiveness

• Acts with integrity and professionalism
• Demonstrates adaptability and resilience
• Excellent organizational and time management skills
• Sensitivity towards cultural diversity
• Takes a proactive lead, handles queries, manages issue resolution
• Commitment to quality, detail-oriented approach, and a strong work ethic

Interpersonal Skills

• Influences others across all levels
• Foster open communication
• Builds and maintains positive relationships
• Delivers persuasive presentations to senior management

Growth & Innovation

• Challenges existing procedures
• Identifies weaknesses and proposes improvements
• Encourages continuous learning and improvement

The above statements are intended to describe the general nature and level of work being performed by people assigned to this job. They are not intended to be an exhaustive list of all responsibilities, duties, and requirements.