Software Engineer

Senior Software Engineer - AI Team (.NET/C#)

We're partnering with a fast-growing fintech and payments business that's building intelligent, AI-powered software used by thousands of businesses across the UK.

They're now looking for a Senior Software Engineer to join their AI team, focused on developing production-grade AI systems that automate complex financial and accounting workflows - not just chatbots.

You'll work in a small, autonomous squad with full ownership across the stack, from scalable back-end services to intuitive front-end interfaces, collaborating closely with the AI platform team to bring LLM-powered features into core products.

What you'll be doing

• Architect and build scalable, secure AI-powered applications
• Design performant back-end services in C# / .NET, integrating with AI systems
• Develop user-friendly front-end interfaces using Blazor or React/Vue/Angular
• Lead technical direction, mentor engineers, and promote best practices
• Collaborate with AI teams to design and deliver real production features

What you'll need

• Proven full-stack experience delivering production web applications
• Hands-on experience with LLMs / GenAI / ML in production
• Strong background in C#, .NET, REST APIs, and cloud platforms (Azure, AWS, or GCP)
• Agile mindset with focus on testing, observability, and secure delivery
• Excellent communication and cross-functional collaboration skills

Nice to have

• Experience with vector databases, RAG systems, or multi-agent AI
• Python skills for AI/ML development
• Familiarity with MLOps, Langfuse, or LiteLLM
• Background in fintech, SaaS, or payments software

Join a forward-thinking fintech where you'll have the freedom to innovate, influence technical direction, and build AI systems that genuinely impact users.