About this role
About the Role As a Software C# Engineer within our Agile delivery team, you will move beyond standard CRUD applications to solve complex network and real-time communication challenges. You will lead the development of expansion products that interface with 3GPP-compliant User Equipment (UE). What You'll Do
- Develop C# components for high-concurrency SIP sessions, managing complex headers and MIME bodies to support features such as First-to-Answer and Group Regroups.
- Implement RTP/RTCP media handling for MCPTT and MCVideo, ensuring seamless floor control (transmission rights) in half-duplex environments.
- Build handlers for MCData services (SDS, File Distribution) using HTTP and SIP MESSAGE requests, and manage XCAP retrieval logic for XML configuration documents.
- Integrate OIDC authentication flows and MIKEY-SAKKE encryption to ensure media transport remains secure and resilient.
- Lead development for expansion products and collaborate with senior product leads to refine core call taking and dispatching offerings. What We're Looking For
- 3+ years of professional experience with a deep focus on asynchronous network programming (C# / .NET Framework / .NET Core) including WCF, SignalR, EF, ASP.NET, WebAPI.
- Understanding of the SIP Protocol Stack (INVITE, PUBLISH, SUBSCRIBE, etc.) and experience with RTP/RTCP stacks.
- Proficiency in parsing complex XML schemas (XSD) and handling multipart/mixed MIME bodies.
- Strong grasp of OOP, SOLID principles, and modern CI/CD workflows (Git, Pull Requests, Agile).
- Excellent problem-solving skills and ability to work in a distributed team (UK & Poland). Nice to Have
- Familiarity with TS 24.379 (MCPTT) or related MCX standards.
- Experience with SRTP, TLS, or Key Management lifecycles (KMS). Compensation & Benefits
- Private medical coverage
- Multisport
- Life insurance (two annual incomes)
- Employee Stock Purchase Plan – 15% discount for buying Motorola’s Stock units
- Employee Pension Plan – 3.5 % of the month’s gross salary, which goes to the retirement account
- IP Tax Relief (up to 80%)
- Yearly salary increase (depends on individual performance)
- Annual bonus (depends on company performance)
- Flexible working hours
- Hybrid work
- Travel requirements Under 10%
- Relocation Provided Domestic