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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. Location: Remote - UK based only. End Date: 9/6/25. A role with Kooth is an exciting chance to join a fast growing business with a social purpose. Our mission is to provide welcoming and effective digital mental health support across the UK.. Kooth is a fast-growing business with a social purpose. Listed on the London Stock Exchange (LSE:KOO), our mission is to provide welcoming and effective digital mental health support.. Working in partnership with the NHS, we are already the UK’s largest digital mental health platform for young people aged 10-25. We use the collective insight from over one million hours of professional support we have provided to guide people to self-help, community support, and professional help that matches their wants, needs, and goals in life.. Role Objective. Senior Engineers are trusted and impactful contributors who help set technical direction and drive execution for their squad and the wider department. They demonstrate ownership across their squad’s work and regularly support others. Their contributions significantly influence Kooth’s product and business objectives.. As a Senior Engineer, you’ll help shape how we build reliable, scalable systems that guide young people to the right help. This is a hands-on role with real-world impact—helping create digital products that are meaningful, empathetic, and technically sound.. What you’ll be doing. . Designing and building RESTful Node APIs, React frontends, and/or React Native mobile apps—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.. . Building and operating a suite of Node.js backend services, React-based web apps, and React Native mobile experiences that form the backbone of our mental health platform.. . Taking end-to-end ownership of features, from idea through to production, with a strong sense of accountability and user impact.. . Improving the systems you work on by applying thoughtful, pragmatic solutions to technical challenges.. . 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.. . Staying current with industry best practices in engineering, CI/CD, and architecture.. . 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 tradeoffs.. . Essential. . 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 (or able to ramp up quickly with a solid engineering foundation), 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.. . 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.. . Focus on pragmatic delivery, able to take ownership appropriately. . Strong communication skills, builds great colleague relationships across disciplines. . Desired. Deep experience with React or 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.