IMS Software Architect (m/f/d)

About us:
Committed to building the next generation of 100% software-based mobile networks, ng-voice is creating innovative mobile infrastructure solutions and making them accessible for operators and enterprises that want to deploy future-proof networks. 

As an IMS Software Architect (m/f/d) at ng-voice, you will have the opportunity to design and build IMS components from scratch, working in an environment that encourages technical ownership, freedom of choice, and creative problem-solving. You will be empowered to challenge legacy approaches and replace them with modern, cloud-native architectures.

This is a hands-on software architecture role with a strong engineering focus. You will not only define architectural concepts but also design and implement software, working closely with development teams to turn architecture into production-ready systems. The role is focused on internal product architecture and engineering, not customer-facing solution design or pre-sales activities.

You will combine telecom protocol expertise with modern cloud-native and microservices-based software architecture to build scalable, resilient IMS components aligned with 3GPP standards.

Tasks:
What you will do as IMS Software Architect (m/f/d):• Own and drive the end-to-end architecture of cloud-native IMS components and network functions (CNF).
• Actively design and contribute to the implementation of IMS components using C, Go, and Python.
• Define architecture, performance, scalability, and resiliency targets for IMS services.
• Design and evolve microservices-based IMS core components (e.g. P-CSCF, I-CSCF, S-CSCF, BGCF, HSS/UDM, TAS).
• Ensure architectural alignment with 3GPP and ETSI standards, including VoLTE, VoWiFi, and VoNR.
• Partner closely with development teams to ensure architectural consistency, code quality, and best practices.
• Translate business and product requirements into clear architectural blueprints.
• Produce high-level and low-level design documents, architecture diagrams, and interface specifications.

Requirements:
What we are looking for in an IMS Software Architect (m/f/d)
Our ideal new colleague brings a strong engineering background and a passion for designing and building complex software systems.

The role is open to experienced medior and senior profiles, depending on depth of hands-on experience and architectural ownership.

You may come from either of the following backgrounds:• A software architect / senior engineer with strong experience in distributed systems and cloud-native architectures, combined with solid IMS knowledge, or
• An IMS expert with hands-on experience in software architecture and modern application design.

Required skills & experience• Proven hands-on experience designing and implementing production-grade software systems.
• Strong understanding of IMS architecture and call flows.
• Solid knowledge of SIP, Diameter, RTP, and related telecom protocols.
• Know-how in cloud-native architectures, and containerization.
• Strong understanding of VoLTE, VoWiFi, and 5G voice (VoNR) solutions.
• Strong programming experience in at least one of the following languages: C, Go, or Python.
• Strong analytical, problem-solving, and documentation skills.
• Ability to collaborate effectively with product, R&D, and cross-functional teams.

Nice to have• Experience with Kamailio, FreeDiameter, or similar open-source telecom frameworks.

Benefits:
A little more about our culture and why you should join • Work-Life-Balance is a priority: Flexible working that suits you - we live and breathe a hybrid remote culture and don't mind where and when you work    
• We are committed to building a diverse team that represents a variety of backgrounds, perspectives, and skills in a traditionally not very diverse industry   
• We offer you the culture of a fast-growing start-up with the maturity of an enterprise company
• We are more interested in your experience and knowledge than formal degrees 
• Entrepreneurial culture and flat hierarchies   
• Mobility benefit, fitness benefit, language class benefit and wellness benefit (for full-time employees)
• Home office budget (for full-time employees)