Avanti is working with an exciting early-stage 5-person fintech startup based in London that is about to launch its first product in the embedded finance space. Their platform helps businesses unlock working capital through intelligent, AI-driven invoice financing solutions, integrated directly into existing financial workflows. With their launch just around the corner, they are now looking for a Mid-Level FullStack Developer to join their growing team. THE ROLE This is not a typical developer role. You’ll be working across both technology and business operations, giving you a unique opportunity to understand how a fintech company is built from the ground up. Around 70-80% of your time will be focused on development, with the other 20-30% focused on working closely with the COO to understand the operational side of the business. You’ll be responsible for: \* Building and maintaining FullStack applications \* Developing APIs and working with databases \* Contributing to frontend and backend development \* Supporting AI-driven features and data workflows \* Debugging, testing, and improving system performance \* Working closely with the business to help automate operational processes TECH STACK \* .NET (backend) \* React (frontend) \* MySQL \* AWS \* Python (AI and data models) Experience Required \* 3+ years of experience in software development \* Strong .NET experience \* Some front-end (React ideally) – however Angular/Vue is fine \* Good understanding of software engineering fundamentals \* Interested in working in a startup / Have startup experience \* AWS exposure (similar cloud is fine) \* Interested in AI Desirable: \* Previously worked in a start-up \* Python experience (Data / AI) Why Join? \* Join a startup at launch stage \* Work on AI-driven fintech products \* Gain exposure beyond coding into real business operations \* Fast-track your development with hands-on experience \* High visibility and real impact from day one Salary is up to £50,000 and you will be required on-site 4 days per week in Central London. If interested then click Apply Now