Senior Software Engineer (Full Stack)

About Movetru Movetru is a Sportstech start-up building the world’s most advanced movement intelligence platform. We bring laboratory-grade biomechanical insight to athletes in real time so they can train smarter, recover better, and perform at their peak. Our work sits at the intersection of advanced analytics and elite sport, and it powers decisions for athletes. We’re a multidisciplinary team of engineers, designers, and sports scientists, supported by international advisors and investors across machine learning, big data, medical devices, and operations. We care deeply about creating a supportive and inclusive culture, and we’re growing fast. We’re hiring people who want to own meaningful work and ship it. Diversity and inclusion is a priority for us, and we want our workforce to reflect that. Our aim is to attract the very best talent and create an environment that supports and includes all of our colleagues. The Role This is a senior, hands-on engineering role at the heart of our product. You’ll lead full-stack development across our mobile apps, React web platform, and AWS backend services. You’ll own the architectural decisions that shape how Movetru scales. We’re a small team, so the scope is wide and your role is a core component to the company. You’ll be a sounding board on technical strategy, an embedded contributor in day-to-day delivery, and a foundation for the engineering team we build around you. What You’ll Do * Build and maintain Movetru’s mobile applications for iOS and Android * Architect and implement service-based systems spanning our AWS backend and React front end * Build and maintain Movetru’s modern web platform in React JS * Design and manage our backend services, APIs, and AWS infrastructure * Design, integrate, and optimise AI agent workflows, and embed AI-driven features into our products and services * Use LLMs and AI agents to accelerate everyday development * Own code quality — write clean, scalable, maintainable code and raise the bar across the codebase * Debug, profile, and optimise complex performance issues across platforms * Collaborate closely with designers, sports scientists, and product to turn research into shipped features * Mentor and shape the engineering practice as the team grows What We’re Looking For Essential * Substantial professional engineering experience (typically 3+ years) with a track record of shipping production software * Strong full-stack experience across mobile, web, and backend development * Strong React JS / JavaScript skills, plus mobile development experience (e.g. React Native or native iOS/Android) * Practical experience designing and operating systems on AWS * Hands-on experience with AI agents and integrating LLMs into real products * Strong understanding of service-based architectures and ownership of complex codebases * Confident debugger and optimiser * Comfortable with Git, CI/CD, and modern development workflows * Excellent communication and collaboration; able to work autonomously, set direction, and meet deadlines without close oversight Nice to have * Prior experience in SportsTech, performance science, computer vision, or wearables * Experience mentoring or technically leading other engineers * Background working at an early-stage startup How We Work * We enjoy working with passionate people doing their best work * We operate across agile and waterfall workflows depending on what the customer needs * We believe in open, direct communication * We embrace AI-assisted development and agent workflows * We use JIRA, Google Workspace, Miro, and Canva Location * On-site at our office in Belfast city centre Compensation \& Benefits * Salary dependent on experience * Workplace pension scheme * Company equity * A high-trust, high-ownership environment where your work directly shapes the product How to Apply Please upload a copy of your CV. Cover letters are optional but welcomed — they’re a good chance to tell us why you’d be right for the role. Please include your salary expectations in your cover letter. Pay: From £35,000.00 per year Benefits: * Employee stock purchase plan * Free parking * On-site gym * On-site parking Ability to commute/relocate: * Belfast, County Antrim: reliably commute or plan to relocate before starting work (required) Experience: * Full Stack: 2 years (preferred) Work authorisation: * United Kingdom (required) Work Location: In person