Software C# Engineer

Company Overview

At Motorola Solutions we believe that everything starts with our people. Were a global close-knit community united by the relentless pursuit to help keep people safer everywhere. We build and connect technologies to help protect people property and places. Our solutions foster the collaboration thats critical for safer communities safer schools safer hospitals safer businesses and ultimately safer nations. Connect with a career that matters and help us build a safer future.

Department Overview

Job 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.

Basic Requirements

Technical Essentials

• 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 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).

In return for your expertise well support you in this new challenge with coaching & development every step of the way. Also to reward your hard work youll get:

• Competitive salary and bonus schemes

• Two weeks additional pay per year (holiday bonus).

• 25 days holiday entitlement bank holidays.

• Attractive defined contribution pension scheme.

• Private medical insurance.

• Employee stock purchase plan.

• Flexible working options.

• Life assurance.

• Enhanced maternity and paternity pay.

• Career development support and wide ranging learning opportunities.

• Employee health and wellbeing support EAP wellbeing guidance etc.

• Carbon neutral initiatives/goals.

• Corporate social responsibility initiatives including support for volunteering days.

• Well known companies discount scheme.

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Travel Requirements

Relocation Provided

Position Type

Referral Payment Plan

Company

EEO Statement

Motorola Solutions is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race color religion or belief sex sexual orientation gender identity national origin disability veteran status or any other legally-protected characteristic.

We are proud of our people-first and community-focused culture empowering every Motorolan to be their most authentic self and to do their best work to deliver on the promise of a safer world. If youd like to join our team but feel that you dont quite meet all of the preferred skills wed still love to hear why you think youd be a great addition to our team.