Gi Group

About the Company

Welcome to Gi Group! Your job, Our work!

Gi Group is one of the world's leading companies providing a full range of HR Services. We offer Temporary, Permanent and Professional Staffing Services, Search & Selection and Executive Search as well as Outsourcing, Training, Outplacement and HR Consultancy. It is our mission to contribute to the evolution of the labour market and to emphasize the personal and social value of work. We aim to support people at each stage of their professional career and be at our clients' side as their businesses grow.

Thanks to direct presence and strategic partnerships, we operate in more than 57 countries across Europe, APAC, Americas and Africa. With a team of more than 4.000 colleagues around the world, our global model, solutions and our expertise in a full range of industries and sectors, we are able to provide valuable specialized services to both international and local customers.

Ranked globally as one of the largest staffing firms by Staffing Industry Analysts, we are also a global corporate member of the World Employment Federation. In 2021, Gi Group Holding achieved a turnover of more than 3.2 billion euros.

Do you want to know more about Gi Group and what we can do for you? Get in touch with us!

Listed Jobs

Company Name

Gi Group

Job Title

Software Engineer

Job Description

**Job Title:** Software Engineer (C#) **Role Summary:** Develop and maintain high‑concurrency, real‑time communication components for a mission‑critical call‑taking and dispatch platform. Work within an Agile team to design, implement, and secure SIP signaling, RTP/RTCP media handling, and related services, influencing technical direction and ensuring system reliability. **Expectations:** - 4+ years of commercial C#/.NET development experience. - Proven ability to design asynchronous, network‑focused solutions. - Strong problem‑solving skills in complex, real‑time environments. - Ability to collaborate with senior product leads and follow Agile/CI‑CD practices. **Key Responsibilities:** - Design and implement C# components for SIP signaling and session management. - Process SIP headers, MIME bodies, and RTP/RTCP streams for voice and video. - Develop MCData services using HTTP and SIP MESSAGE protocols. - Manage XCAP configuration retrieval and XML document handling. - Ensure secure communications via OIDC authentication and MIKEY‑SAKKE encryption. - Work with WCF, SignalR, Entity Framework, ASP.NET/WebAPI in a CI/CD pipeline. - Contribute to technical decisions and documentation within the Agile team. **Required Skills:** - C# and .NET (Framework and/or .NET Core) - Asynchronous programming and multithreading - SIP protocol stack and RTP/RTCP knowledge - WCF, SignalR, Entity Framework, ASP.NET/WebAPI - XML (XSD) and multipart/mixed MIME handling - OOP, SOLID principles, Agile methodologies - CI/CD toolchains (e.g., Azure DevOps, GitLab CI) **Nice‑to‑Have Skills:** - Familiarity with 3GPP MCPTT/MCX standards - Experience with SRTP, TLS, KMS, or other encryption/key management solutions - Exposure to emergency services environments (police, fire, ESN) **Required Education & Certifications:** - Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience). - Relevant certifications (e.g., Microsoft Certified: Azure Developer Associate) are a plus but not mandatory.

Rugby, United kingdom

Hybrid

Junior

03-02-2026