Senior API Software Engineer

Senior Software Engineer - AI Automation Platform - Belfast/Hybrid

We're partnered with an AI Powered Fintech who are moving into the first stage of a large scale expansion over the next 6 months. They will have a number of different AI focused roles going live but to start we're focused on finding a number of Senior Software Engineers focusing on API architecture and design.

The team is currently focused on developing a platform designed to accelerate AI and generative AI initiatives across the organisation. This is the core team who are leading the build and implementation efforts.

Join a high-growth SaaS team building real AI automation — not chatbots. We’re talking end-to-end workflow intelligence : document ingestion accounting tax filing — used by tens of thousands of businesses.

You’ll architect and own the API layer that powers product integrations, platform scalability, and smart AI features across multiple mission-critical systems.

What you’ll do:

- Design and build secure, scalable APIs in C#/.NET + Azure

- Shape API standards, gateway strategy, versioning & authentication

- Drive event-driven integrations and seamless third-party connectivity

- Lead API performance, reliability, and observability improvements

- Mentor engineers and influence architecture across multiple teams

What you bring:

- Deep C#/.NET experience in production systems

- Strong REST API design + OpenAPI/Swagger knowledge

- SQL expertise + cloud experience with Azure services

- Security-first engineering mindset (sensitive data handling)

- Ownership across the lifecycle — design build deploy run

If this sounds like the next step in your career, send across your CV immediately or contact Adam Whitehurst at Trust in soda for more info.