Software Engineer

Software C# Engineer

Salary: £50ph (Inside IR35)

12 months contract role - beginning April

Remote role with 1 day per month on-site at the Rugby office

As Gi Group, we are supporting an international company delivering mission-critical solutions used daily by emergency services across the UK and Europe. The project focuses on Guardian, a call-taking and dispatching platform that enables 999 and 112 operators to respond effectively when every second matters.

As a Software C# Engineer, you will join an Agile engineering team working on complex, real-time communication systems that go far beyond standard CRUD applications. You will contribute to the core Guardian platform while also taking ownership of expansion products interfacing with 3GPP-compliant user equipment.

THE ROLE:

Your responsibilities will include:

  • Designing and developing C# components for high-concurrency SIP signaling and session management
  • Handling complex SIP headers and MIME bodies to support advanced call-handling features
  • Implementing real-time media processing using RTP/RTCP for Mission Critical Voice and Video
  • Developing MCData services, including and SIP MESSAGE-based communication
  • Managing XCAP configuration retrieval and XML document handling
  • Ensuring secure communications through OIDC authentication and MIKEY-SAKKE encryption
  • Collaborating closely with senior product leads and influencing the technical direction of the platform

THE CANDIDATE:

We are looking for an experienced engineer who is comfortable working with network-centric, highly available systems and real-time communication technologies.

  • 4+ years of commercial experience with C# and .NET (.NET Framework and/or .NET Core)
  • Strong background in asynchronous and network-focused programming
  • Hands-on experience with WCF, SignalR, Entity Framework, ASP.NET, WebAPI
  • Solid understanding of SIP protocol stacks and RTP/RTCP
  • Experience working with complex XML schemas (XSD) and multipart/mixed MIME messages
  • Good knowledge of OOP, SOLID principles, and Agile / CI/CD practices

Nice to have:

  • Familiarity with 3GPP standards such as MCPTT or other MCX specifications
  • Experience with SRTP, TLS, or key management systems (KMS)
  • Previous exposure to emergency services environments, ESN, or police/fire control rooms
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Job Details

Company
Gi Group
Location
Rugby, Warwickshire, UK
Hybrid / Remote Options
Posted