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# Software C# Engineer

- **Company:** Motorola Solutions, Inc.
- **Location:** United States
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, XML Schema, Agile Methodology, C Sharp (Programming Language), Protocol Stack, Complex Networks, Continuous Integration, Windows Communication Foundation, Key Management, Multi-Purpose Internet Mail Extensions (MIME), Network Programming, Object-Oriented Software Development, OpenID, Parsing, Session Management, SignalR, Software Engineering, WebRTC, Extensible Markup Language (XML), Data Processing, .NET Core, Git, Solid Principles, Web Api, Crud
- **Published:** July 11, 2026
- **Apply:** http://hbcunetwork.com//cgi-bin/jobs/searchJobs.cgi?job_id=35132151

## About the Role

* C# / .NET Framework / .NET Core Mastery: 3+ years of professional experience with a deep focus on asynchronous network programming.
* .NET Frameworks Experience: WCF, SignalR, EF, ASP.NET, WebAPI
* Protocol Expertise: A solid understanding of the SIP Protocol Stack (INVITE, PUBLISH, SUBSCRIBE, etc.) and experience with RTP/RTCP stacks.
* Data Handling: Proficiency in parsing complex XML schemas (XSD) and handling multipart/mixed MIME bodies.
* Software Engineering Principles: Strong grasp of OOP, SOLID principles, and modern CI/CD workflows (Git, Pull Requests, Agile).

Preferred (The "Nice to Haves")

* 3GPP Standards: Familiarity with TS 24.379 (MCPTT) or related MCX standards.
* Security: Experience with SRTP, TLS, or Key Management lifecycles (KMS).
* Domain Knowledge: Previous experience with UK Police Control Room environments or the Emergency Services Network (ESN).

## Description

As a Software 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).

Core Responsibilities

* SIP Signaling & Session Management: Develop C# components for high-concurrency SIP sessions, managing complex headers and MIME bodies to support features like "First-to-Answer" and Group Regroups.
* Real-Time Media Plane: Implement RTP/RTCP media handling for Mission Critical Voice (MCPTT) and Video (MCVideo), ensuring seamless floor control (transmission rights) in half-duplex environments.
* Data & Configuration: Build handlers for MCData services (SDS, File Distribution) using HTTP and SIP MESSAGE requests, and manage XCAP retrieval logic for XML configuration documents.
* Secure Communications: Integrate OIDC authentication flows and MIKEY-SAKKE encryption to ensure media transport remains secure and resilient.


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