2,094 Stack Engineer jobs in the United Kingdom

Full Stack Engineer Multi-Tenancy SaaS Platform (Mid-Senior Level)

Hull (Hybrid, with regular travel to HQ in Peterborough)

Full-time | Permanent

£55,000 £65,000 DOE + Benefits + Bonus

crooton is an award-winning recruitment technology company building next-generation, AI-powered, multi-tenancy SaaS platforms for employers across the globe. Were looking for two talented Full Stack Engineers to join .

Are you enthusiastic about working in the renewable energy sector on cutting-edge systems for wind turbine blade inspection? At Perceptual Robotics, we're seeking a driven individual to join our team as a full stack end web software engineer. In this role, you'll collaborate with our skilled team to develop innovative solutions for our web products, including a management dashboard, internal data tools, and new unreleased products.

This is an exceptional opportunity to contribute to the development of solutions with a significant impact in the renewable energy space. Our small but highly capable team is deeply connected to the industry and shares a passion for creating innovative solutions. Join us on this exciting journey!

We are committed to building a diverse and inclusive workplace that values equal opportunities. We welcome individuals from all backgrounds, cultures, ethnicities, races, genders, ages, languages spoken, veteran's status, religions, disabilities, sexual orientations, and beliefs to bring their unique contributions to our team.

Requirements

Role and Responsibilities:

- Develop across our core products with the wider development team

- Mockup new features and interfaces

- Build modern, fast, and secure web applications using React and Meteor

- Develop efficient data access patterns within our Python API to support application performance and scalability

- Collaborate to define the direction of our products

- Continuously work with the broader team to improve systems, processes, and development tooling

- 3rd line support - participate in a team rotation to contribute to product support, addressing bug fixes and user requests. 

Minimum Requirements:

- A proven track record of developing modern web applications in a collaborative tech team (minimum 3 years)

- Strong core JavaScript and Node.js programming skills

- Strong React skills
- Experience with event-driven design patterns and frontend state management (Redux, Context API)

- Python experience for backend development

- Experience with database design and query optimization in web applications

- Professional-level English proficiency

- Knowledge of web infrastructure best practices and experience in applying them to improve availability, performance, scalability, and security.

Desired:

- Knowledge of databases and database development tools, including AWS DynamoDB and MongoDB.

- Familiarity with modern testing methodologies and libraries like BDD, Jest, and Storybook

- Experience with Cypress or similar testing libraries

- Proficiency in NextJS or Meteor

- Knowledge of web vulnerabilities and mitigation strategies (e.g., OWASP top 10)

- Experience with design of interface mockups (e.g. figma)

- Proficiency in developing in a Linux system

- Ability to thrive in a fast-paced environment

- Capability to gather requirements, perform impact analysis for application changes, and work on project delivery teams

- Contribution to building and nurturing an inclusive and diverse working environment

- Experience with optimizing DevOps workflows in a small team setting, with an eye towards scaling

Benefits

- Remote work, and optional hybrid working at our offices in Bristol and Athens.

- Open to part time roles

- Company share option plan

- No dress code formalities

- Flexible working hours

- An annual training budget to help you develop your skills and advance your career

Lyst is a global Fashion Tech company and premium shopping app, founded in London in 2010 and catering to over 200M shoppers per year. We offer our customers the largest assortment of premium & luxury fashion items & products in one place, via an assortment of 8.5M+ items from over 17,000 of the world’s leading brands. We are a scale-up business with a current team size of c.150 people in London, combining an agile mentality with a proven business model and over a decade of experience. This provides a balance between foundations and structure, and autonomy and pace.

At Lyst we obsess over the customer, providing a search & discovery experience which offers inspiration, fulfilment, and personalisation. We believe that fashion is amazing but shopping for fashion often isn’t, and use our technology, data and creativity to bring more joy, greater choice and fewer fails. Our mission is to help fashion shoppers make better decisions and help fashion partners find better audiences as the category-leading destination for every fashion shopper. Lyst has raised over $160m from leading investors including Accel, Balderton, Molten Ventures, Fidelity International, and LVMH.

We’re looking for a Full Stack Engineer to join our Member Experience squad — a collaborative, cross-functional team dedicated to improving the experience for Lyst members (users who create an account). You’ll get to work across user personalisation, our stock and price alerts, as well as the optimisation and creation of member-exclusive features. Member Experience work spans across the website, the mobile app, our CRM database and our e-mail/push-notification service with dedicated team members for each area. Together, we focus on creating seamless, engaging experiences that make it easier for people to join, stay, and get the most out of Lyst.

What will you be working on?

• Building new and maintaining existing features (frontend and backend) and functionality for our e-commerce platform.
• Developing primarily in Python (Django) for the backend and JavaScript/TypeScript (React) for the frontend.
• Integrating with internal/external APIs and services.
• Owning features from initial planning through to deployment, ensuring they deliver real value.
• Writing reliable, well-tested code, using tools such as pytest, Jest with React Testing Library, Storybook, and Cypress for end-to-end coverage.
• Monitoring performance and stability through observability tools, keeping our platform running smoothly.
• Champion knowledge-sharing by crafting documentation that’s as delightful to read as it is useful.
• We are fully AWS hosted. You’ll get to use a range of tools and services, such as Kubernetes, Docker, Postgresql, Redis, SQS, SNS, S3, etc.
• Collaborating with product managers, designers, QA engineers and web/app engineers to help execute on product vision and drive value for our business.
• Deploying features as experiments (e.g. A/B testing) and measuring the impact.
• Scaling, improving and maintaining our system for sending push notifications and emails to our customers.

Requirements

Requirements:

• Solid experience with Python and web frameworks (we use Django).
• Strong understanding modern JavaScript/TypeScript, HTML, and CSS with some experience in a Component-Based UI framework (we use React)
• A firm grasp of web fundamentals and how everything fits together.
• You write robust, maintainable code that others can read with ease.
• Experience within automated testing, especially unit testing, would be majorly advantageous.
• An eagerness to improve existing codebases through thoughtful refactoring rather than patching over issues.

Things that matter to us:

• You are curious at heart and like to take ownership of something to make it better.
• You are detail oriented.
• You are a team player and communicate with your peers and other stakeholders in the company on a day to day basis.
• You are able to communicate clearly and be humble when sharing ideas with everyone on the team. You are able to explain your ideas clearly and transform them into plans. You are able to design the solution to a complex problem.
• Sense of ownership over products, features and services the team looks after.
• You have experience iterating & refactoring existing code as well as writing new code.

Here’s what to achieve after your first 3 months:

• Gain deep familiarity of our tech stack, including the architecture, codebases, workflows and tooling.  You should be comfortable under the hood!
• Deliver work at a suitable cadence, demonstrating efficiency and consistent progress.  Ship your feature!
• Use best practises and encourage others to do the same.  Lead with quality!
• Review pull requests in a timely manner including actionable, impactful and constructive feedback.  Raise the bar with every PR!
• Build relationships across the organisation and collaborate effectively across product, design and other engineers.  You won’t be working alone!
• Take responsibility for tasks end-to-end showing reliability in agreeing on commitments and meeting them.  Be the teammate everyone can count on!

Benefits

• Our Ways of Working: We all come into the office on Tuesdays and Thursdays , with the option to work remotely or come into the office on the other days. We believe that in person collaboration and community spirit is super important, which is why we spend some of our time in the office and some of our time at home.
• Time Off: In addition to the 8 statutory bank holidays, you will receive 29 holidays per year. Lyst’s holiday year runs from 1 April to 31 March.
• Competitive Family Leave Package: This includes Enhanced Family Leave for those eligible, paid Time off for Dependents and Support for Fertility Treatment & Loss.
• Clothing Benefit: We want you to enjoy using the Lyst app and site as much as our customers, so we provide you with a clothing allowance to use on Lyst every year. This starts at £250 when you join and increases up to £,000 with your length of service.
• Private Healthcare: Our healthcare provider is Vitality. Your health is important to us which is why we offer all employees a comprehensive healthcare scheme from the day you start.
• Training Allowance: We’re big on continuous learning and growth, so all employees are currently entitled to an annual training allowance of £1 00. This can be used to attend conferences, industry events, training courses and to purchase resources.
• Pension Scheme: Our pension provider is The People’s Pension. We offer a minimum employee contribution of 5% and 3% employer contribution.
• Eye Tests and Vouchers: Employees can make a saving on their eye test and glasses through our chosen provider. You’ll receive a free eye test every year and a discount towards glasses.
• Cycle-to-Work Scheme: Lyst will purchase a bicycle from your chosen retailer, you will then receive a voucher to pick up your bicycle from them.
• Transport Season Ticket Loan: Employees can apply for an interest free season ticket loan to support your travel to work.
• Social Events: Frequent company wide social events including Christmas & summer parties, sports days, themed drinks, quizzes, cook alongs, as well as smaller team socials. We also have plenty of interest based groups such as football, running club, book club, culinary and more.

We want to build a world where fashion works for everyone, and we want teams that are just as inclusive. Diversity and inclusion is an integral part of our culture at Lyst. We recognise and celebrate the value and impact diversity brings to our company and are committed to ensuring this is a consistent focus, for which we are held to account. We are committed to treating all applicants fairly and equally, and encourage candidates from all backgrounds to apply for this role. We are happy to talk about flexible working arrangements.

Don’t meet every single requirement? Studies have shown that women and people of color are less likely to apply to jobs unless they meet every single qualification. At Lyst we are dedicated to building a diverse, inclusive and authentic workplace, so if you’re excited about this role but your past experience doesn’t align perfectly with every qualification in the job description, we encourage you to apply anyway. You may be just the right candidate for this or other roles.

Full Stack Engineer

Based : London offices or Remote (UK)
Term : Permanent, Full time
Salary : £48000 - £58000 pa + excellent benefits

The Role:

Focusrite Group is looking for a Full Stack Engineer to join the Web Engineering team.

You will be responsible for building and maintaining high-quality and maintainable code that is well-performing, secure, and follows all coding standards. We are going headless, using modern front-end frameworks, and making more use of cloud technologies.

You will be working on making our back-end scalable and performant. You will also be working with designers writing web user interfaces in a semantic and accessible way. You have a good grounding in Node JS experience working with micro-services (REST APIS) and experience with content management systems.

You will also be joining the team on their journey as we adopt development practices like continuous integration, TDD, and infrastructure as code. You will work closely with other developers, pairing remotely, implementing features and bug fixes, and reviewing pull requests in an agile scrum environment.

Key responsibilities and duties will include:

• Build shippable software following engineering standards in place.
• Develop, build, and maintain both website and API systems.
• Review the code of other engineers to ensure the overall code quality and to encourage a collaborative development environment.
• Keep up to date with the latest technologies and methodologies.
• Ensure the code is delivered on time and is of the required quality.
• Work with other engineers across the entire business.
• Ensure a globally robust and highly scalable approach to development to support our growing number of users and services.

Skills and experience required:

• Experience with Node JS and PHP.
• Experience designing REST APIs.
• Experience developing content management systems (preferably Drupal and Contentful).
• Practice test-driven development and continuous integration/deployment (we use Circle CI).
• Comfortable with relational databases (specifically MySQL).
• Experience developing applications in the cloud (preferably AWS).
• Experience with Web Services and Rest APIs using JavaScript
• Comfortable using a modern JavaScript framework (preferably React).
• Understand common web infrastructure tooling (CDN, databases, in-memory caches, etc).
• Agile experience of working within a continuous and iterative delivery cycle.
• Familiar with git-based workflows (pull requests, rebasing, etc.). We use GitHub.
• Understand accessibility and how it applies to your markup.
• Understand code performance and how this can affect a website’s overall loading

Experience of any of the following would be an advantage:

• Good CSS knowledge (Sass).
• Experience with e-commerce and integrating with payment gateways.
• Experience with GraphQL.
• Experience with Typescript.
• Experience with infrastructure as code (Terraform)

About you :

• You are enthusiastic and self-motivated, with the ability to work on projects proactively.
• You have excellent communication and interpersonal skills.
• You are keen to pass on knowledge to other team members.
• You are innovative and creative, with a logical and methodical approach to problem-solving.
• You have a meticulous attention to detail, with an overall passion for continuous improvement.
• You enjoy the flexibility to work on everything from infrastructure as code to front-end.

About Us

Focusrite plc is a global music and audio group that develops and markets music technology products. Used by audio professionals and amateur musicians alike, our solutions facilitate the high-quality production of recorded and live sound. Our audio technology brands stand together, seeking to enrich lives through music by removing barriers to creativity – ‘we make music easy to make’.

The Focusrite Group trades under thirteen established and rapidly growing brands: Focusrite, Focusrite Pro, Novation, ADAM Audio, Sequential, Oberheim, Martin Audio, Optimal Audio, Ampify Music, Linea Research, Sonnox, OutBoard and TiMax. With a high-quality reputation and a rich heritage spanning decades, its brands are category leaders in the music-making industry.

Music technology is an enriching space to work in and we enjoy a Group-wide open-door culture which encourages innovation. This culture, combined with a passion for the inspirational solutions we create, has led to the group winning numerous accolades, including three Queen's Awards for Enterprise, the AIM Company of the Year Award 2021 and regular appearances in 'The Sunday Times 100 Best Small Companies to Work For’.

The Focusrite Group is dedicated to building a great place to work and as an equal opportunity employer we are committed to Diversity and Inclusion. The group mission is to cultivate an equitable culture, internally and externally, where all people feel they are welcome, safe and positively represented, because at Focusrite they truly are. Equally, we recognise the major impact that climate change is having on our world and work every day towards being industry leaders in a carbon neutral future.

Benefits include flexible/hybrid working, company pension, life insurance, private healthcare, employee purchase scheme, group bonus scheme, company music events, offsite company parties and free lunch in the canteen. We arrange company training sessions and encourage personal development.

About the job you're considering

We are looking for a highly motivated Full Stack JavaScript Developer to join our Experience Engineering team. Our team is a dynamic and diverse community of technologists who drive digital transformation for some of the world’s largest organisations, turning challenging problem statements into transformative customer experiences. This role is exclusively open to UK sole nationals who either hold or are eligible for Security Clearance (SC). Ex-forces candidates welcome.

Join us in our mission to innovate and excel in the defence industry. Our team is at the forefront of developing cutting-edge technologies and solutions that ensure national security and defence. You will have the opportunity to work on groundbreaking projects that involve the latest advancements in artificial intelligence, cybersecurity, and autonomous systems. Our commitment to innovation means you will be part of a team that is constantly pushing the boundaries of what is possible, making a real impact on the future of defence.

Your role

Your responsibilities as a Full Stack Developer at Capgemini include, but are not limited to:

• Designing, developing, and maintaining both front-end and back-end components of web and mobile applications using JavaScript, Node.js, and modern frameworks and libraries such as React, Angular, or Vue.js.
• Collaborating with architects and other developers to design robust, scalable, and secure architectures for new projects and enhancements to existing systems.
• Participating in agile development processes, including sprint planning, daily stand-ups, and retrospectives.
• Conducting thorough code reviews to ensure code quality, performance, and adherence to best practices.
• Contributing to improving our teams’ development processes, tools, and techniques to enhance productivity and product quality.
• Working closely with clients and internal teams to understand requirements, provide technical guidance, and deliver solutions that exceed expectations.
• Staying up to date with the latest industry trends and technologies, and drive continuous learning and innovation within the team.

Your skills and experience

• Proven experience in full stack JavaScript development, with a strong focus on Node.js and server-side development.
• Experience of at least one leading Node framework (Express.js, Nest.js, Hapi.js)
• Expertise in at least one modern front-end framework (Nest.js, Remix.js).
• Proficiency in HTML5, CSS3, and JavaScript (ES6+).
• Experience with TypeScript and modern development tools and practices.
• Experience of Test Driven or Behaviour Driven Development.
• Knowledge of Cloud-Native development and serverless architectures (AWS, Azure, Google Cloud).
• Familiarity with CI/CD pipelines and DevOps practices.

Your security clearance

To be successfully appointed to this role, it is a requirement to obtain Security Check (SC) clearance .

To obtain SC clearance, the successful applicant must have resided continuously within the United Kingdom for the last 5 years, along with other criteria and requirements.

Throughout the recruitment process, you will be asked questions about your security clearance eligibility such as, but not limited to, country of residence and nationality.

Some posts are restricted to sole UK Nationals for security reasons; therefore, you may be asked about your citizenship in the application process.

What does 'Get The Future You Want' mean for you?

• You will be empowered to explore, innovate, and progress. You will benefit from Capgemini’s ‘learning for life’ mindset, meaning you will have countless training and development opportunities from thinktanks to hackathons, and access to 250,000 courses with numerous external certifications from AWS, Microsoft, Harvard ManageMentor, Cybersecurity qualifications and much more.
• You’ll be bringing your unique skills and perspectives to the team, inspiring and taking inspiration from your teammates as you unlock value in everything you do. You’ll be joining a professional community of experts, who have got your back and will support you, every step of the way.

Why you should consider Capgemini

Growing clients’ businesses while building a more sustainable, more inclusive future is a tough ask.  When you join Capgemini, you’ll join a thriving company and become part of a collective of free-thinkers, entrepreneurs and industry experts.  We find new ways technology can help us reimagine what’s possible.  It’s why, together, we seek out opportunities that will transform the world’s leading businesses, and it’s how you’ll gain the experiences and connections you need to shape your future.  By learning from each other every day, sharing knowledge, and always pushing yourself to do better, you’ll build the skills you want. You’ll use your skills to help our clients leverage technology to innovate and grow their business. So, it might not always be easy, but making the world a better place rarely is.

About Capgemini

Capgemini is a global business and technology transformation partner, helping organisations 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 340,000 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 fuelled by its market leading capabilities in AI, generative AI, cloud and data, combined with its deep industry expertise and partner ecosystem. The Group reported 2024 global revenues of €22.1 billion.

GenAI Full Stack Engineer
UK Wide - travel expectation required

70,000 - 80,000 + perm benefits

Are you passionate about cutting-edge technology and ready to help shape the future with GenAI? We're looking for a GenAI Full Stack Engineer to design, develop, and deliver intelligent applications that drive real impact for clients across industries. We're a team of transformation specialists who blend strategy, creativity, and deep tech expertise to solve complex business challenges. You'll work on high-impact projects that bring together the latest advancements in AI, cloud, and full-stack development.

Responsibilities:

• Build proof-of-concept GenAI applications using tools like RAG and intelligent agents
• Scale prototypes into production-ready systems
• Design and develop full-stack applications for GenAI and non-GenAI projects
• Create the infrastructure and tooling to support robust, scalable solutions
• Experiment with emerging technologies and mentor others to grow technical capabilities
• Lead and support business development activities, including proposals and client pitches
• Contribute to thought leadership, internal initiatives, recruitment, and team-building

Technical Expertise:

• Backend: Python (FastAPI) or TypeScript (Express)
• Frontend: React (TypeScript) with Next.js or Vite
• GenAI: Familiar with LangChain, LangGraph, CrewAI, Vercel AI, etc.
• LLMs: Hands-on with OpenAI, Anthropic, LLaMA, Mistral, or similar
• Cloud: AWS or Azure proficiency
• Containers & IaC: Docker, Kubernetes, Docker Compose, Terraform
• Monitoring: Langsmith, Langfuse, or similar
• CI/CD: GitLab, GitHub, Jenkins
• Databases: SQL (PostgreSQL), NoSQL (MongoDB), vector DBs (ChromaDB, Pinecone, Qdrant, etc.)

Professional Skills:

• Experience working in agile delivery environments
• Excellent communication and stakeholder management
• Demonstrated leadership in project delivery or team management
• Eligible for or holding active SC (Security Check) Clearance

GenAI Full Stack Engineer
UK Wide - travel expectation required

70,000 - 80,000 + perm benefits

Are you passionate about cutting-edge technology and ready to help shape the future with GenAI? We're looking for a GenAI Full Stack Engineer to design, develop, and deliver intelligent applications that drive real impact for clients across industries. We're a team of transformation specialists who blend strategy, creativity, and deep tech expertise to solve complex business challenges. You'll work on high-impact projects that bring together the latest advancements in AI, cloud, and full-stack development.

Responsibilities:

• Build proof-of-concept GenAI applications using tools like RAG and intelligent agents
• Scale prototypes into production-ready systems
• Design and develop full-stack applications for GenAI and non-GenAI projects
• Create the infrastructure and tooling to support robust, scalable solutions
• Experiment with emerging technologies and mentor others to grow technical capabilities
• Lead and support business development activities, including proposals and client pitches
• Contribute to thought leadership, internal initiatives, recruitment, and team-building

Technical Expertise:

• Backend: Python (FastAPI) or TypeScript (Express)
• Frontend: React (TypeScript) with Next.js or Vite
• GenAI: Familiar with LangChain, LangGraph, CrewAI, Vercel AI, etc.
• LLMs: Hands-on with OpenAI, Anthropic, LLaMA, Mistral, or similar
• Cloud: AWS or Azure proficiency
• Containers & IaC: Docker, Kubernetes, Docker Compose, Terraform
• Monitoring: Langsmith, Langfuse, or similar
• CI/CD: GitLab, GitHub, Jenkins
• Databases: SQL (PostgreSQL), NoSQL (MongoDB), vector DBs (ChromaDB, Pinecone, Qdrant, etc.)

Professional Skills:

• Experience working in agile delivery environments
• Excellent communication and stakeholder management
• Demonstrated leadership in project delivery or team management
• Eligible for or holding active SC (Security Check) Clearance

I’m working with a great company based in the Central London, and they’re looking for a Full Stack Engineer- Back Office to join their team.

You'll play a key role in implementation of the applications and working on BAU tasks and continuous maintenance and evolution of key components and services.

The ideal candidate:

• Major focus needs to be back-end development with C# and .Net along with Angular experience.
• Extensive experience working in a trading environment or similar financials environment.
• Extensive experience in Finance and Accounting – Collateral, Settlement, Credit Risk. – More Back Office.
• Development of services, API’s and serverless functions in a cloud environment.

If this sounds like an interesting opportunity to you, feel free to apply for this position or drop me your CV at

Please note - Ideally, you have Golang experience, but they’re completely open to any language as long as you have the ability and willingness to learn!

Role: Senior Full Stack Developer

Tech: SQL, Golang, React, TypeScript, REST/GraphQL, Docker/Kubernetes, AWS/GCP

Location: Remote-first, with 1 monthly team meetup in Birmingham

Salary: £70,000–£80,000

Our client is building the next generation of internal platforms for a global tech learning company, and this is your chance to help shape it from the ground up!

They are on a mission to help developers put software to work in smarter ways and are now entering a bold new phase, replatforming the business to meet customer needs, including the rise of GenAI. This is a greenfield project with big ambitions and real impact.

Who we're looking for:

We're hiring a Senior Full Stack Developer who’s confident across the modern web stack - from backend APIs and databases to frontend performance and usability. You’ll help deliver powerful new tools and infrastructure across the business while helping set technical direction and best practices.

This isn’t just another product iteration. They are building a platform that will change how they work, how their customers learn, and how they deliver value.

What you'll be working on:

• Tools to automate product marketing and streamline content workflows
• Real-time data tools to help authors improve their content
• Seamless integrations with 60+ global content distribution channels
• Micro-sites for niche audiences, powered by headless commerce and CMS
• Experiments with AI to automate tedious processes and forecast success

What you bring:

• Strong experience with SQL and backend languages like Golang, Python, or PHP
• Knowledge of React and frontend performance optimisation
• Experience building and maintaining RESTful or GraphQL APIs
• Solid understanding of databases, schema design, and indexing strategies
• Familiarity with cloud platforms (AWS/GCP) and containerised environments (Docker/Kubernetes)
• A collaborative mindset and excellent communication skills

2-stage interview process, no coding task!

Please reach out to Joely at Synchro to hear more.