Fully Remote Senior C#. NET IOT Developer (Outside IR35) at CodeFirst, Republic of Ireland, £400-£450 per day

We have a rare opportunity for a long-term, remote-working senior C# developer contract that falls outside of IR35.

About the Role
We are seeking a Senior .NET Software Engineer with proven, production-grade experience in C# .NET to lead and deliver critical software components across simulation, IoT integration, and industrial-facing services. You will operate as a hands-on engineer with ownership over architecture, reliability, and long-term technical direction.


Required Skills & Experience

• Minimum 5 years solid C# .Net experience.
• Experience of architecting systems.
• Experience with event-driven logic or simulation-style logic (DES, workflows).
• Strong data modelling abilities and an understanding of how to represent real-world processes in software.
• Experience with building systems that interact with external devices or services.
• Excellent communication skills and the ability to work effectively with mechanical, electrical, and controls engineers (ability to pitch concepts and defend principles).

Additional Skills

• Blazor (WASM or Server) development experience.
• Experience with IoT platforms, device integration, or industrial communication protocols.
• Familiarity with OPC UA, FT Optix, or industrial automation software.
• Experience modelling processes using graphs, routing, or state machines.

Why Apply?

• The opportunity to build software used alongside real industrial equipment and IoT devices.
• A role with significant architectural influence and technical ownership.
• A collaborative environment where software and engineering disciplines work closely together.
• Training and support to learn the industrial-automation and IOT domains.