Integration Engineer (5G and IMS)
Ericsson · Belgrade
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About this opportunity:
We are looking for an Integration Engineer with hands-on experience in Communication Services, specifically 5G and IMS. In this delivery-focused role, you will be responsible for deployment, configuration, end-to-end integration and verification of Core Network and Cloud IMS solutions, to meet customer requirements and quality standards.
Key Responsibilities
- Plan, execute and document integration, configuration and verification activities for 5G Core and Cloud IMS solutions in customer projects
- Perform end-to-end system integration across multiple network nodes and interfaces, ensuring interoperability and performance
- Analyze and resolve integration, configuration and performance issues, working closely with design, support and customer teams
- Contribute to deployment and migration plans, rollout strategies and cutover activities for new solutions and upgrades
- Implement and maintain automation scripts, tools and procedures to improve integration efficiency and quality
- Collaborate with project managers, solution architects and customer technical teams, providing technical input and status updates
- Ensure solutions are integrated in line with product documentation, roadmaps, security and compliance guidelines
- Produce and maintain technical documentation (integration guides, configuration baselines, test reports)
- Share knowledge, best practices and lessons learned within the team and wider organization
Required Skills and Experience
- Bachelor’s degree in Engineering or Computer science
- CS Core, UDM and IMS Portfolio Knowledge
- Knowledge of virtualization and cloud platforms, including OpenStack and Kubernetes
- Hands-on experience in integration, verification and troubleshooting of telecom network solutions, ideally in 4G/5G Core and IMS domains
- Strong understanding of telecom signaling protocols and interfaces relevant to Core and IMS (such as SIP, Diameter, HTTP/2, MAP)
- Understanding of LDAP directory services and databases
- Understanding of IP networking and protocols (routing, switching, TCP/IP, DNS, firewalls, load balancers)
- Strong hands-on experience integrating IMS and 5G Core nodes (CSCF, MTAS, SBC/BGF, MRF, AFG, NELS, etc.) in operator environments.
- In-depth understanding of VoLTE/VoNR, IMS call flows, 4G–5G interworking, and related protocols (SIP, Diameter, HTTP/2, MAP etc.).
- Ability to design and execute complex integration test campaigns and assess impacts on customer networks and services.
- Proven capability to work in customer projects (Network Build, Integration & Optimization) with cost/time accountability, in multi-vendor environments
- Additional programming skills are an advantage
- Excellent written and spoken English skills.
- 5–10 years of relevant experience in a similar role
Personal Attributes
- Excellent communication skills and ability to collaborate in diverse, international teams
- Customer-focused mindset with strong sense of ownership and accountability
- Curiosity and willingness to continuously learn new technologies and ways of working
- Ability to work under pressure in dynamic project environments and manage multiple tasks
- Strong analytical and problem-solving skills, with a structured and detail-oriented way of working
- Team player who actively contributes to a positive, collaborative and inclusive working culture
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