Solution Architect - IMS
Summary
Designs and owns IMS telecom core network solutions at Ericsson in Kolkata — turning customer needs into resilient VoLTE/VoWiFi architectures (CSCF, SBC, TAS, DNS/ENUM) with HLD/LLD design, integration, testing, and troubleshooting, while driving NFV and cloud-native evolution on Kubernetes. Needs 9-15 years in telecom core/IMS with 5+ in architecture roles.
Join our Team
About this opportunity:
Join our dynamic team at Ericsson as a Solution Architect. In this pivotal role of Design IMS solutions that scale, interoperate, and perform. You will turn customer needs into robust architectures, lead end-to-end design across multi-vendor environments, and guide delivery teams from blueprint to acceptance. The goal is simple, resilient IMS, ready for VoLTE, VoWiFi, and cloud-native evolution.
What you will do:
• Own the IMS solution architecture, align HLD and LLD with customer requirements, standards, and Ericsson best practices.
• Define reference architectures for CSCF, SBC, TAS, DNS/ENUM, and related domains, including integration with EPC/5GC.
• Lead discovery and translate business and technical needs into clear design decisions, risks, and trade-offs.
• Produce and review design deliverables, HLD/LLD, capacity and scaling models, security controls, data flows, and call flows.
• Set integration strategy and guardrails, support MOP definition for live activities, and ensure design compliance during rollout.
• Define test strategies for SIT, IOT, and UAT, align acceptance criteria with KPIs and SLAs, and sign off on readiness.
• Guide troubleshooting on complex issues, drive root cause analysis, and steer corrective actions with L2/L3 teams.
• Optimize architecture for performance, resilience, and cost. Lead parameter tuning guidance and capacity planning.
• Shape the cloud journey with NFV and cloud-native patterns on Kubernetes, and promote automation across on-prem and hybrid clouds.
• Partner across domains, Cloud, PACO, Transport, Security, and customer stakeholders. Run technical workshops and design reviews.
• Maintain architecture standards, reusable patterns, and knowledge assets for repeatable delivery.
The skills you bring:
• Deep understanding of IMS architecture and 3GPP standards, with practical design authority in multi-vendor environments.
• Strong grasp of SIP, SDP, DIAMETER, and call flows for VoLTE and VoWiFi, with interworking to EPC/5GC.
• Hands-on credibility with IMS nodes, CSCF, TAS, SBC, DNS/ENUM, plus policy and charging touchpoints.
• Proficiency in Linux fundamentals, networking, routing, DNS, TLS, and security principles for IMS.
• Experience defining test strategies and acceptance for carrier-grade services and KPIs.
• Comfort with logs and traces, and tools like Wireshark, to validate design and isolate defects.
• Cloud and virtualization know-how, NFV, containers, Kubernetes, CI/CD, and exposure to cloud-native IMS.
• Scripting for automation advantage, Python or Shell, to support design validation and tooling.
• Clear communicator who can lead technical discussions, simplify complexity, and influence decisions.
The skills you bring:
• BE/B.Tech/MCA or equivalent.
• 9 to 15 years in telecom core or IMS, with at least 5+ years in solution or architecture roles.
• Proven track record delivering IMS, VoLTE or VoWiFi, from design to acceptance in live networks.
• Certifications are a plus, IMS or VoLTE, Linux, cloud, Kubernetes, OpenStack.