4,201 Javascript Engineer jobs in the United Kingdom

JavaScript Software Engineer - React.js Developer

West Hove, East Sussex offices - 4 days in office, 1 day per week remote

My client are a UK SaaS company building an enterprise scale Data Analytics platform for their global customer base. Theyare looking to recruit a Software Engineer with good experience of building web UIs using React.js

This role will involve developing React applications for existing client systems and multiple new Greenfield projects for their customers, ensuring that their clients and stakeholders are always accessing performant, engaging, well-written software.

This role is working 4 days per week in their lovely offices in West Hove (1 day remote), paying to 60k per annum

As an experienced Software Engineer with good React/TypeScript experience you will work an environment that rewards dedication, hard work and getting stuck right in.

They use React.js & TypeScript with other tools (TailwindCSS) to build highly scalable, performant Web Frontend systems for our platform that provides extremely customisable reporting services on many Terabytes of data every single day for each customer. There are opportunities to work on Full stack projects as well if you want.

This role is open to mid-level and senior level developers and the successful candidate will be passionate about Software Engineering, especially with well written, scalable code.

Skills and experience:

• At least 5 year's commercial experience
• Strong experience of React.js
• Proficiency in TypeScript and / or JavaScript
• Capable using HTML and Tailwind CSS or similar tool
• Developing applications in React including component design and state management for specific use cases
• General understanding of infrastructure as code and CI/CD pipelines and the willingness to learn more
• Basic experience with AWS platform
• Comfortable using version control, primarily Git

Please apply with your CV for immediate interview.

Job Title

React JS Developer

Get The Future You Want!

Choosing Capgemini means choosing a company where you will be empowered to shape your career in the way you’d like, where you’ll be supported and inspired by a collaborative community of colleagues around the world, and where you’ll be able to reimagine what’s possible. Join us and help the world’s leading organizations unlock the value of technology and build a more sustainable, more inclusive world

Role Overview:

We are seeking a skilled and passionate UI Developer with strong front-end development experience to join our team. The ideal candidate will have hands-on expertise in modern UI technologies and frameworks, with a keen eye for detail and a commitment to delivering accessible, high-performance web applications.

Your Role

• Develop and maintain responsive user interfaces using JavaScript, jQuery, HTML5, CSS3, and ReactJS and other UI technologies
• Implement and optimize styles using CSS preprocessors such as SASS or LESS.
• Work with JavaScript frameworks including Node.js to build scalable front-end solutions.
• Integrate APIs and handle asynchronous data using AJAX and JSON.
• Ensure compliance with accessibility standards and best practices.
• Apply Test-Driven Development (TDD) principles and write automated unit tests using mock object frameworks.
• Collaborate with cross-functional teams to ensure seamless integration and deployment.
• Utilize SCM tools like Git and Perforce for version control and collaboration.
• Leverage tools such as SonarQube, Grunt/Gulp, and npm for code quality and build automation.
• Conduct JavaScript unit testing to ensure code reliability and maintainability.
• Optimize network performance and front-end load times for enhanced user experience.

Your Profile

• Strong proficiency in JavaScript, HTML5, CSS3, and ReactJS.
• Experience with CSS preprocessors (e.g., SASS, LESS).
• Solid understanding of Node.js and modern JS frameworks.
• Familiarity with AJAX, JSON, and RESTful APIs.
• Knowledge of accessibility standards (WCAG, ARIA).
• Experience with unit testing frameworks and TDD methodologies.
• Proficiency in Git, Perforce, and build tools like Grunt, Gulp, and npm.
• Understanding of network performance optimization techniques.

About Capgemini

Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world while creating tangible impact for enterprises and society. It is a responsible and diverse group of 350,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fueled by its market-leading capabilities in AI, cloud, and data, combined with its deep industry expertise and partner ecosystem. The Group reported 2023 global revenues of €22.5 billion.

We’re Dayshape—an award-winning software scale-up with big ambitions and the momentum to match. Trusted by Big Four and many other top professional services firms globally, our AI-powered resource management platform is helping organizations to achieve extraordinary results. 

Our enterprise platform stands apart as the only solution that combines advanced AI, real-time project financials, and firm-wide insights to elevate resource management to a strategic function. By driving profitable growth, powering confident decisions, and ensuring satisfied clients and teams—we're helping our customers build strong organizations and careers for the long term.

Why our customers love Dayshape:

• We help professional firms optimize margins and increase revenue, unlocking access to more profitable work. 

• We provide complete operational visibility today and the tools to confidently predict tomorrow. 

• We empower firms to be where top talent wants to work and where top clients want to buy from.

Recognized as Scotland’s fastest-growing tech company in the Deloitte Technology Fast 50 for three consecutive years, we’ve consistently proven our ability to innovate and deliver real impact—and we’re always looking for like-minded people to join us.

At Dayshape, our purpose is to improve people's working lives, and our culture is an important driving force in helping us to do just that. We're a friendly, inclusive, and ambitious team—driven by our values and a shared commitment to success. If you’re ready to join a fast-growing, high-impact company that’s reimagining resource management, then let’s talk.

We've come a long way in a short time, but there's still so much more we can do. We have grand ambitions to make Dayshape the most scalable, flexible and rapid to deploy solution on the market, and we’re not there yet. That’s where you come in. 

As part of our Engineering team, you will be delivering UI-driven features that help our customers schedule thousands of hours of work with ease.  You will help us build scalability, resilience and high performance into the product, all while keeping an eye on UX, accessibility and aesthetics. 

• Develop new features and enhancements 
• Write and upgrade UI components using JavaScript and Vue.js 
• Work with the rest of our engineering team to enhance scalability, performance and maintainability 
• Support our culture of learning, development and teamwork 
• Be involved in the entire life-cycle of features, including idea creation, deployment, and longer term updates and enhancements  

• Demonstrable experience in a similar commercial software engineer role
• A confident JavaScript developer, happy writing both vanilla JS and modern frameworks (ideally Vue.js) 
• Experience working in a product development environment 
• Comfortable writing unit tests and end-to-end automated tests 
• Passionate about shipping a product you can be proud of 
• Well-informed on good software development principles, and able to implement them pragmatically 
• An excellent and kind communicator, able to raise awkward questions kindly, and to recognise when you need help 
• Experience collaborating with others - you will be working closely with engineering, product and QA colleagues 
• Adaptable, and motivated to try/learn new things 
• Great at breaking down large tasks into manageable chunks 
• Able to see the Big Picture - how your decisions affect your colleagues and your users 

• Experience working with agile development teams on large products 
• Experience in C# or a similar language
• Experience working with complex web interfaces with large DOM views 
• Experience writing tests in Jest, Cypress or Playwright 
• Experience with the rest of our stack: SQL Server, and/or Microsoft Azure 
• Experience working in (or with) the Professional Services industry 

• Starting salary between £39,898 and £6,500, depending on experience 
• Earning potential in the Software Engineer salary band up to £ ,500  
• At least £1 00 per year to spend on professional and personal development   
• 33 days' holiday per year (including bank holidays), increasing by 1 day each year to a maximum of 40 days   
• Paid four week sabbatical in your fifth anniversary year on top of your holiday entitlement   
• Enhanced family leave policies   
• Private healthcare and rewards through Vitality   
• Income protection and death in service cover   
• Matched 5% auto-enrolment workplace pension scheme   
• Access to wellbeing offerings, such as our Employee Assistance Programme and a dedicated counselling service   
• Innovation Week twice a year - a chance to experiment and work off-project
• Volunteering time – up to 20 hours a year to participate in volunteer work
• Regular All Hands meeting for inspiration and over-communication   
• Time out of the working week for team socials each month, with a mix of in-person and virtual options: past events include hiking, family BBQs, board games and at-home cocktail classes!   
• Genuinely nice, smart people to work with, who are excited about growing our company 

This is a full-time role (37.5 hours per week). We typically work from 09:00 - 17:30 from Monday to Friday, though we can be flexible around this, just let us know. 

We’re ideally looking for someone in/around Edinburgh, though we’re open to the possibility of this being a remote role (as long as you're in the UK). We're making the most of hybrid working, so you won't need to come into the office everyday (unless you want to!). 

We don't mandate required office time, but we find that most of the team enjoy working from home 3-4 days a week, and come into our office to connect with each other, make use of space, and for meetings. 

Equality of opportunity is more than just a responsibility: we believe it’s a huge advantage to welcome a variety of experiences and perspectives into the team. Diversity is a great asset and, as such, we strongly encourage applications from any background. 

This is your opportunity to really influence how we get things done, and how our product develops to meet our customers’ needs. We're doing well, but there's lots more to do in order to maintain the high bar and pace that we've set. 

If your experience isn't an exact match for this job description, but you have transferrable skills/experience that you think would be a great fit, please outline this in a cover letter. Everyone here is growing personally as the company grows, so if that sounds like something you’d like to be part of, we’d love to see your application. We are also currently hiring across the Engineering department, with roles at different levels - all open opportunities can be found on our careers page:

The deadline for applications is 5pm BST on Friday 3rd October with interviews taking place over the following couple of weeks. 

*Please note the successful candidate for this role will be subject to background checks and will have an opportunity to declare anything to us beforehand* 

Developer with Perl, JavaScript, API, Oracle, and Unit Testing / Integration Testing experience. 6 month initial contract. Remote (UK Based) 675/day (inside IR35)

Our client is looking for a Developer with experience around Perl Scripting, JavaScript, APIs, Version Control (Git) Oracle and testing for an initial 6 month contract. You'd be working from home (but you have to be based in the UK for this role).

Your Key Skills & Experience:

• Perl scripting
• Oracle Database design and development
• JavaScript
• Architectural Design Patterns

UK based (remote work - but you have to be in the UK)

6 month initial contract length

675/day inside IR35 - so you'll be working via an Umbrella company

If this role sounds of interest, please do send me your CV to start a conversation.

Adecco acts as an employment agency for permanent recruitment and an employment business for the supply of temporary workers. The Adecco Group UK & Ireland is an Equal Opportunities Employer.

By applying for this role your details will be submitted to Adecco. Our Candidate Privacy Information Statement explains how we will use your information - please copy and paste the following link in to your browser (url removed)

Developer with Perl, JavaScript, API, Oracle, and Unit Testing / Integration Testing experience. 6 month initial contract. Remote (UK Based) 675/day (inside IR35)

Our client is looking for a Developer with experience around Perl Scripting, JavaScript, APIs, Version Control (Git) Oracle and testing for an initial 6 month contract. You'd be working from home (but you have to be based in the UK for this role).

Your Key Skills & Experience:

• Perl scripting
• Oracle Database design and development
• JavaScript
• Architectural Design Patterns

UK based (remote work - but you have to be in the UK)

6 month initial contract length

675/day inside IR35 - so you'll be working via an Umbrella company

If this role sounds of interest, please do send me your CV to start a conversation.

Adecco acts as an employment agency for permanent recruitment and an employment business for the supply of temporary workers. The Adecco Group UK & Ireland is an Equal Opportunities Employer.

By applying for this role your details will be submitted to Adecco. Our Candidate Privacy Information Statement explains how we will use your information - please copy and paste the following link in to your browser (url removed)

• REQUIRED: Git, AWS stack

• Role based: e.g. SQS, SNS, Lambda, Microservices, React and/or Node JS

• REQUIRED: Git, AWS stack

• Role based: e.g. SQS, SNS, Lambda, Microservices, React and/or Node JS