javascript engineer jobs in Cardiff

Senior Full-Stack Engineer - Go/JavaScript Salary: £80,000 - £90,000 Location: Fully-remote Tech: Go, JavaScript, .NET About the role: We’re working with a leading organisation in the legal sector, renowned for their award-winning approach to technology-driven innovation, in support of their efforts to strengthen their growing SaaS team. They are looking for a senior software engineer with...

You will mentor a small team of 3 talented developers while remaining hands-on with coding and solution design. You’ll help define how software is built, scale systems, and influence the technical direction of a globally used SaaS product. You’ll be supported by a collaborative leadership team that values technical excellence, autonomy, and personal growth.

Job Title: Full Stack Developer Location: London, UK (Remote) Job Type: Full-time contract, 12 Months Role’s Responsibilities: • Design, develop, and maintain end-to-end web applications using Python, JavaScript (Node.js/React), and MongoDB. • Build and deploy microservice-based architectures aligned with 12-Factor App principles, ensuring scalability, maintainability, and resilience. •...

Full-stack JavaScipt Developer – Remote (UK) £60k - £65k Join a well-established, tech-first company that has been transforming its industry for over a decade. Backed by a leading investment group, the business is on a journey of both technological and commercial transformation, with technology at the very core of its strategy and daily operations—not just a support function. You’ll be part of...

Job Summary: We are seeking a detail-oriented Software Quality Assurance (QA) Engineer to ensure the quality and reliability of software applications through rigorous testing and validation. The ideal candidate will have a strong understanding of QA methodologies, excellent analytical skills, and experience in both manual and automated testing. Key Responsibilities: - Design, develop, and...

Up to £90,000 Remote, UK & Ireland No Sponsorship Opportunities We’re hiring for our client, a fast-growing global payment processing platform that’s scaling rapidly after a major acquisition. They’re on the lookout for talented .NET Software Engineers to join their journey of building the next generation of API-driven, merchant-first technology. Why join them? They believe empowered teams...

QA Engineer - £480 inside IR35 Contract (Remote, once a quarter in Cardiff) - Ruby Experience Please note: This is primarily a remote role; however, candidates must be UK-based and able to attend the office once per quarter. La Fosse is partnering with a leading software company to recruit a QA Engineer on a 6-month contract. This role will focus on supporting the migration of a legacy...

Senior Ruby on Rails Engineer Location: Hybrid or Remote We’re partnered with clients that are looking to bring in Senior Ruby on Rails Developers. What we’re looking for - 5+ years of experience with Ruby on Rails. - Strong knowledge of RESTful APIs and service-oriented architecture. - Cloud experience with AWS or GCP is an advantage. - Familiarity with front-end technologies (JavaScript,...

🤖 Experienced Full Stack Engineer | AI Robotics Start-Up | Fully Remote (UK) 🤖 Join a very exciting AI robotics start-up at the forefront of autonomous systems. We’re looking for a Full Stack Engineer passionate about building intelligent robots, AI-driven automation, and cutting-edge software that interacts with the real world. This is a unique opportunity to work fully remotely, collaborate...

RUST Software Engineer 100% Remote Working - Must be based within Europe Daily rates up to $475 (Subject to experience) - Will be paid in USD Duration TBC (Long-Term contract) Ideal start date Monday 15th December 2025 Our client is a Web3/Blockchain organisation that are currently working on some high-profile projects, and they are currently in need of a RUST Software Engineer on a contract...

Ready for a challenge? Then Just Eat Takeaway might be the place for you. We’re a leading global online delivery platform, and our vision is to empower everyday convenience. Whether it’s a Friday-night feast, a post-gym poke bowl, or grabbing some groceries, our tech platform connects tens of millions of customers with hundreds of thousands of restaurant, grocery and convenience partners across...

Software Development Engineer in Test (Fixed Term Contract – 14 Months Maternity Cover) Location: Hybrid – travel to our Bideford HQ when required Contract Type: Fixed Term (14 months maternity cover) Reports to: QA Lead We’re looking for a Software Development Engineer in Test (SDET) to join our QA team on a 14-month fixed-term contract. You’ll play a key role in ensuring the performance and...

Full Stack Engineer £50,000 - £65,000 Manchester (Remote First - must be flexible for Ocassional Travel) Candidates must be eligible for UK Security Clearance and hold Sole British Nationality for vetting purposes. Our client, a leader within the Cyber Security space is currently growing their intelligence team who support across cutting-edge public-sector projects within the central...

You will be responsible for writing clean and maintainable code that aligns to their business requirements whilst ensuring all engineering work is covered by suitable unit tests within the team. You’ll collaborate with other Software Engineers, Product Owners, Scrum Masters and internal stake holders to support standards, growth and discipline within this product development team.

A prominent IT consultancy is actively searching for a talented Full Stack Engineer to join their team on a permanent basis. The ideal candidate will possess extensive experience in developing robust web applications using Java (Spring Boot), HTML, CSS, and JavaScript/TypeScript. This role offers an exciting opportunity to work on innovative projects, collaborate with a dynamic team, and...

Principal / Senior-Staff Engineer I’m supporting a global tech company that’s going through an exciting transformation and is looking for a high-impact Principal / Senior-Staff Engineer. This is a hands-on individual contributor role with significant influence across teams and leadership, directly reporting into the CTO. The role is ideal for someone who thrives at the intersection of deep...

You will be someone who pushes commercial value and helps improve team values. You relish the opportunity to work with like minded people, helping influence and reinforce value through data-driven decision making.

You will champion new technologies when it’s right for the business.

Full Stack Software Engineer Remote UK based up to £90,000 I’m supporting a forward-thinking client who is transforming how legacy systems are modernised. You’ll be joining a high-impact team led by a Director of Technology, working alongside AI Engineers, an AI Product Manager, and top-tier developers focused on automating software migrations using cutting-edge tools like LangChain,...

We’re building the next generation of merchant-first digital solutions and we’re looking for a Senior Software Engineer to help shape it. You’ll join a small, empowered team that values innovation, collaboration, and real-world impact. What You’ll Do - Design and develop backend, service, and portal systems for our payment platform. - Use modern practices such as BDD and CI/CD to deliver...

You will be part of a cross functional core team, supported by engineering resources from other JET teams in a number of countries.

You will be expected to work in close collaboration, providing direction and support to these teams as we expedite the process of migrating and enhancing technical assets onto one global platform, to foster new commercial opportunities and enable innovation.