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)

About us

ng-voice is an equal opportunity employer. We believe demographic characteristics and diverse experiences that have nurtured unique viewpoints benefit our growth and performance and value each person and their different background as a whole.

Hope we caught your attention; we look forward to getting to know you!

DISCLAIMER

Even if you do not meet 100% of the requirements, however, you think this role will be a good match for you, please send in your application. We would love to be in touch!

Please be aware that we are currently not collaborating with agencies and any profile received will not be taken into consideration.