C# Integration Developer

Integration Developer (C#) – Hybrid in Maidenhead – Up to £70k Been coding integrations since before APIs were cool? Perfect. We’re looking for an experienced C# Developer who knows their way around modern APIs like a pro and can make systems talk to each.For over 40 years, my client has been helping businesses thrive with smart tech solutions. Now, they need someone who can help keep everything connected—securely, reliably, and with a sprinkle of brilliance.What’s in it for you?

• Hybrid working: 3 days a week in their Maidenhead office, the rest from wherever you do your best thinking.
• A salary up to £70,000 (because great talent deserves great pay).
• A culture that’s won awards for being awesome (and yes, people like working here—average tenure is over 10 years!).

What you’ll do:

• Build and maintain integrations with financial systems, telematics platforms, and mapping APIs.
• Make sure everything runs smoothly, securely, and in line with GDPR (because nobody likes compliance headaches).
• Help partners and customers set up integrations without needing a PhD in tech jargon.
• Keep things documented, monitored, and logged.

What we’re looking for:

• Solid experience with C#/.NET in integration-heavy environments.
• Deep understanding of REST, WebAPI, and event-driven architectures.
• Skills in building fault-tolerant systems (think retries, queues, circuit breakers).
• A security-first mindset (authentication, encryption, GDPR).
• Great communication skills—because explaining tech shouldn’t feel like decoding hieroglyphics.

Bonus points if you’ve:

• Worked with financial or ERP systems.
• Swagger/OpenAPI experience.
• Played around with Azure or automation tools like Power Automate/Zapier.
• Dabbled in IoT or telematics.

To find out more feel free to reach out to me directly with an up to date CV at and we can have a chat.