Senior Fullstack Software Engineer

Taking part in a clinical trial can ask a lot of people, especially as trials become more complex. At Little Journey, we’re building Trial Flow, a participant support platform that makes that experience simpler, clearer and more supportive, helping participants and caregivers around the world feel prepared for what comes next. We're looking for an experienced Fullstack  Software Engineer who wants to do more than pick up tickets and write code. You'll work in a small, autonomous product squad where engineers help understand the problem, design the solution, make the trade-offs and own what they build in production.  For us, engineering starts before the code.  We value engineers who take the time to understand the problem, think about the wider system and design the right solution before reaching for an implementation. We value strong fundamentals, curiosity and engineering judgement.  You'll report to the Engineering Manager within your product squad and be part of our broader engineering team of around 10.  This is a full-time role, either hybrid (Leeds) or fully remote in the UK. We cannot sponsor visas to work in the UK. What you'll do  Shape what we build — work with Product and Design to understand user and business problems, challenge assumptions and help decide what’s worth solving before designing the solution.  Design and break down complex solutions — think across user journeys, APIs, data, architecture, security, failure modes and operational impact, make the design visible through diagrams and lightweight technical documentation, then turn it into a clear, staged or phased technical approach.  Build across the full product stack — mastery of frontend and mobile development and APIs, services and data models.  Own what you build — from testing and deployment through to observability, production support and learning from incidents.  Raise the bar for the team — review designs and code, share knowledge and help improve our engineering practices.  How we work  We don't believe great engineering comes from working the longest hours. We believe it comes from building the right things, working together and leaving systems better than we found them. We're a small team, so trust, ownership and collaboration matter. Everyone has a voice, everyone contributes, and everyone is expected to help make the team stronger.  We value:  Make thinking visible: diagrams and design docs aren't bureaucracy; they're how we think together, challenge assumptions and make better decisions.  AI as a partner, not a substitute for judgement: we use AI to accelerate implementation, freeing engineers to spend more time on problem solving, design and the decisions that matter, while keeping accountability human.  Quality over speed: we move quickly, but not at the expense of reliability, security or maintainability.  Collaboration over heroics: the best solutions come from engineers, Product and Design solving problems together.  …