Senior Software Engineer (Node.js/React)

The company and our mission:  Zartis is a digital solutions provider working across technology strategy, software engineering, and product development. We partner with firms across financial services, MedTech, media, logistics technology, renewable energy, EdTech, e-commerce, and more. Our engineering hubs in EMEA and LATAM are full of talented professionals delivering business success and digital improvement across application development, software architecture, CI/CD, business intelligence, QA automation, and new technology integrations. We are looking for a Senior Software Engineer to work on a project in the digital mental health sector. The project: Our teammates are talented people that come from a variety of backgrounds. We’re committed to building an inclusive culture based on trust and innovation. You will be part of a distributed team revolutionising digital mental health care, creating the UK’s largest platform that supports and empowers young people with their mental health. As a Senior Software Engineer,  you will help set the technical direction and build reliable, scalable systems that guide young people to the right help. What you will do: - Design, build, and operate a suite of Node.js backend services, React-based web apps, React Native mobile and web experiences that form the backbone of their platform. - Take end-to-end ownership of features, from idea through to production, with a strong sense of accountability and user impact. - Ensure the impact of a legacy platform through proactive maintenance, strategic incremental enhancements and high-quality technical support. - Contribute to system design and architectural evolution. - Lead by example in trunk-based development, automated testing, CI/CD, and infrastructure-as-code principles. - Take ownership of performance, resilience, observability, maintainability, security, and accessibility. - Actively collaborate across disciplines and mentor colleagues through pairing, code reviews, and knowledge-sharing. - Drive a shared understanding of user needs, commercial priorities, and how technical decisions influence business outcomes. - Participate in the out-of-hours on-call rota and improving system reliability and incident response processes. - Continuously improve the systems you work on, applying a thoughtful and pragmatic approach to technical challenges. - Stay current with industry best practices in engineering, CI/CD, and architecture. What you will bring: - At least 3+ years of hands-on experience in full-stack software development in a product-oriented environment. - Proficiency 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. - 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. 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. What we offer:  - 100% Remote Work. - WFH allowance: Monthly payment as financial support for remote working. - Training: For Tech training at Zartis, you have time allocated during the week at your disposal. You can request from a variety of options, such as online courses (from Pluralsight and Educative.io, for example), English classes, books, conferences, and events. - Mentoring Program: You can become a mentor in Zartis, receive mentorship, or both. - Career Growth: We have established a career development program accessible for all employees with a 360º feedback that will help us to guide you in your career progression. - Zartis Wellbeing Hub (Kara Connect): A platform that provides sessions with a range of specialists, including mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars with such professionals as well. - Flexible Working schedule.  - Multicultural working environment: We organize tech events, webinars, parties, and activities to do online team-building games and contests.