Salary: £70,000 - 70,000 per year Requirements: 5 years experience as a Senior Back End Engineer Proficiency in Python, supported by FastAPI and MongoDB Solid grounding in modern system architecture and design patterns Experience with distributed systems, asynchronous workflows, and event-driven design Strong knowledge of relational and NoSQL databases Experience building and consuming APIs at scale Familiarity with CI/CD, containerization, and DevOps aligned workflows Optional: Experience with light front-end work (e.g. React) for API integration Responsibilities: Join a high-performing cross-functional product environment Help shape systems central to business operations Influence technical direction, standards, and ways of working Contribute to modern engineering practices, automation, and quality discipline Work under an Agile methodology in a clean, service-led architecture Move fast, communicate, learn, and solve problems as part of the team Technologies: API CI/CD DevOps FastAPI MongoDB NoSQL Python React Backend More: We are a scale-up financial services disrupter, investing heavily in our Engineering function as we transition to bespoke in-house platforms. Our business is undergoing genuine transformation, with engineering at the core of our roadmap. This role is offered as UK remote work, complemented by quarterly meetups in our Cardiff office. We respect engineering talent and invest in ongoing technology, providing a strong pension scheme, an emphasis on paid training and development, and a career pathway into leadership as we scale. last updated 9 week of 2026