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Full-Stack Software Engineer Senior I at Kooth. Job Title: Full-Stack Software Engineer Senior I. Reports to: Engineering Manager. Direct Reports: 0. Full time position. This is a remote role, however candidates must be based in the UK. . Kooth PLC are on a mission to use technology as a way to remove any barriers that could prevent someone accessing the mental health support that they need. At Kooth, we create a welcoming space for effective personalised digital mental health care. Kooth is available to over 7.8 million users, who are able to go online and access effective therapy and wellbeing support by speaking to qualified counsellors to manage their mental health in a safe and anonymous way.. Kooth is the longest established digital mental health provider in the UK but became the first digital mental health company to list on the London Stock Exchange in 2020, so now is a great time to join and help us support more people towards better mental health.. Vision:. At Kooth, our sole purpose is to create easy to access online mental health services that work alongside you to provide compassionate and effective support. To achieve this, we continually strive to build and deliver a product that preserves anonymity and autonomy and removes the barrier of stigma and barriers to access. Accessibility is at the heart of our product design and clinical delivery.. Kooth values:. Our values have been built by our Kooth communities and our employees and are at the heart of everything we do.. Alongside you.  - We are alongside you, warm, welcoming and companionable.. Flexible.  - We offer choice because you are in control of what you need.. Compassionate . - We don’t judge. We listen, counsel and support.. Committed . - No matter what support you need, we’re here to help.. Safe . - We are a safe space for users and we are serious about safeguarding. Why this role?. This is an opportunity to apply your talents to the youth mental health crisis. . This is an incredibly exciting time to join Kooth. We are building the future of personalised digital mental health care and have an opportunity in 2026 to better serve an increasing number of young people across the world. Our new platform has been rebuilt from the ground up (on modern tech and concepts) to support this journey, and is now being launched in the UK.. What you’ll be doing. Designing, building and operating a suite of Node.js backend services, React-based web apps, React Native mobile and web experiences that form the backbone of our mental health platform.. Ensuring the impact of a legacy platform through proactive maintenance, strategic incremental enhancements and high-quality technical support.. Contributing to system design and architectural evolution.. Leading by example in trunk-based development, automated testing, CI/CD, and infrastructure-as-code principles.. Taking ownership of performance, resilience, observability, maintainability, security, and accessibility.. Taking end-to-end ownership of features, from idea through to production, with a strong sense of accountability and user impact.. Actively collaborating across disciplines and mentoring colleagues through pairing, code reviews, and knowledge-sharing.. Driving a shared understanding of user needs, commercial priorities, and how technical decisions influence business outcomes.. Contributing to and occasionally leading technical discussions and decisions.. Supporting onboarding and professional growth of junior engineers and new hires.. Participating in the out-of-hours on-call rota and improving system reliability and incident response processes.. Continuously improving the systems you work on, applying a thoughtful and pragmatic approach to technical challenges.. Staying current with industry best practices in engineering, CI/CD, and architecture.. 3+ years of hands-on experience in full-stack software development in a product-oriented environment.. Proficient in TypeScript, Node.js, and either React or React Native, as well as database technologies such as PostgreSQL and experience in delivering a web or native mobile application.. Deep enthusiasm for full-stack software engineering with strong problem-solving capabilities.. Solid understanding of modern system architecture and the ability to contribute to its evolution.. Commitment to quality,  with experience shipping maintainable, scalable, and well-tested code.. Ownership mentality with a focus on pragmatic delivery and continuous improvement.. Skilled in agile practices, data-informed decision-making, and building reliability.. Excellent communication and collaboration skills, including mentoring and inspiring peers, and building great relationships across disciplines. A team player who values collective success and nurtures a positive, inclusive engineering culture.. A proactive approach to solving technical challenges and influencing engineering direction.. Nice to have. Deep experience with React and React Native in production environments.. Experience operating production systems and improving them through observability, testing, and thoughtful design.. A track record of delivering product improvements that tie into measurable business and user outcomes.. Familiarity with cross-platform design, mobile/web accessibility, and monorepos.. Expertise in trunk-based development, test automation and infrastructure as code.. Experience with scalable system design and architecture patterns.. Exposure to cloud-native technologies, particularly GCP or AWS with Kubernetes.. Leadership in cross-functional initiatives or technical working groups.. Company Location: United Kingdom.