Solution Architect - IMS

Technology, Data & Digital · Software & Web Development · Software Engineering · Cloud Engineering

In short

Ericsson is looking for a Solution Architect in Kolkata, India, to design and develop IMS solutions. This role involves creating robust architectures, leading end-to-end design in multi-vendor environments, and ensuring resilient IMS ready for future evolution like VoLTE, VoWiFi, and cloud-native technologies.

Responsibilities

Own the IMS solution architecture, aligning HLD and LLD with customer requirements, standards, and best practices.
Define reference architectures for CSCF, SBC, TAS, DNS/ENUM, and related domains, including integration with EPC/5GC.
Translate business and technical needs into clear design decisions, risks, and trade-offs.
Produce and review design deliverables, including 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, including parameter tuning and capacity planning.
Shape the cloud journey with NFV and cloud-native patterns on Kubernetes, promoting automation across on-prem and hybrid clouds.
Partner across domains (Cloud, PACO, Transport, Security) and with customer stakeholders, running technical workshops and design reviews.
Maintain architecture standards, reusable patterns, and knowledge assets for repeatable delivery.

Requirements

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.

Desired Qualifications

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.

Skills

IMS architecture3GPP standardsSIPSDPDIAMETERVoLTEVoWiFiEPC5GCCSCFTASSBCDNS/ENUMLinuxnetworkingroutingDNSTLSsecurityWiresharkNFVcontainersKubernetesCI/CDPythonShell scripting

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About Ericsson

Pioneering technology for connecting billions of people worldwide

Our purpose \nTo create connections that make the unimaginable possible.\n\nOur vision\nA world where limitless connectivity improves lives, redefines business and pioneers a sustainable future.\n\nOur values\nPerseverance, professionalism, respect and integrity.\n\nThe future is a place for purpose & vision – ours are clear, and we invite partners, customers and consumers to join us in our journey. \n\nFor a brighter future. For all. Let's #ImaginePossible

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