Solution Architect - IMS

Ericsson; Kolkata District; On-site; INR 1,800,000 - 3,000,000; Full time

Job summary

Ericsson AB is seeking an experienced Solution Architect to design scalable IMS solutions that interoperate across multi-vendor environments and evolve toward cloud-native architectures.

You will lead end-to-end design from blueprint to acceptance, shaping reference architectures for CSCF, SBC, TAS, DNS/ENUM, and ensuring alignment with customer needs, KPIs, and SLAs in carrier-grade telecom networks.

Qualifications

• Must have deep IMS architecture knowledge and 3GPP standards.
• Strong SIP/SDP/DIAMETER and VoLTE/VoWiFi expertise.
• Hands-on IMS nodes (CSCF/TAS/SBC/DNS/ENUM) and policy touchpoints.
• Proficiency in Linux, networking, DNS, TLS, and IMS security.
• Experience defining test strategies and KPIs for carrier-grade services.

Responsibilities

• Own the IMS solution architecture and align designs with customer requirements.
• Define reference architectures for CSCF, SBC, TAS, DNS/ENUM and EPC/5GC.
• Lead discovery and translate needs into design decisions and risks.
• Produce and review HLD/LLD, capacity models, security controls, data flows.
• Set integration strategy, MOP, and ensure design compliance during rollout.
• Define test strategies for SIT, IOT, and UAT and sign off readiness.
• Guide troubleshooting, root-cause analysis, and corrective actions with L2/L3.
• Shape cloud journey with NFV, Kubernetes, and cloud-native patterns.

Skills

IMS architecture

SIP/DIAMETER call flows

IMS nodes

Linux networking

Test strategies

Wireshark

Cloud & NFV

Python/Shell scripting

Communication skills

Education

BE/B.Tech/MCA or equivalent

Job description

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.