Principal Engineer

## About this opportunity Principal technical leader for the system architecture and routing-protocol design of Ericsson's IPOS network operating system on the Router 6000 platform. Own the design of the control-plane and routing subsystems end to end, and shape the platform infrastructure and security foundations that IPOS is built on turning architectural intent into robust, scalable, competitive implementation. This is a senior individual-contributor role: you set technical direction for a major subsystem, guide developers, and are accountable for the architectural quality of what ships. ## What you will do Key Responsibilities: System Architecture & Routing Protocols: * Own the architecture and design of IPOS routing and control-plane subsystems IS-IS, BGP, OSPF, MPLS/LDP/RSVP-TE, Segment Routing (SR-MPLS, SRv6), EVPN, and multicast • Define subsystem decomposition, module interfaces, state management, and scaling models (FIB/RIB scale, convergence, high availability, ISSU) • Translate portfolio and segment requirements into concrete protocol feature designs and roadmaps • Drive design for correctness, convergence performance, and route scale across the target segments (mobile backhaul, aggregation, metro/edge, converged IP, DC/DCI) • Shape the platform foundations the routing stack depends on: control-plane infrastructure, inter-process messaging, data-plane/forwarding abstraction, telemetry, and hardware/silicon abstraction • Contribute to build-vs-reuse decisions across merchant silicon and platform components • Ensure the architecture supports cloud-native, containerized, and disaggregated deployment models (vCSR, cloud RAN, CNIS) Security • Embed security-by-design into the routing and control-plane architecture: control-plane protection, secure protocols (IPsec, MACsec, key management), secure boot / trust chain, and hardening against protocol-level attacks • Partner with security specialists to meet product security requirements and evolving standards (incl. post-quantum readiness direction) Quality, Verification & Delivery • Define architecture-level acceptance criteria and drive them through design reviews, verification strategy, and performance benchmarking • Own resolution of complex cross-subsystem technical issues and act as a senior escalation point within the routing/infrastructure domain • Champion engineering excellence design documentation, code quality, and testability • Mentor senior and principal developers; grow protocol and system-design competence within the Bangalore team • Represent the routing/infrastructure domain in cross-site architecture forums (Bangalore, Beijing, Sweden) • Support customer engagements, RFI/RFP responses, bake-offs, and technical win strategies where routing/infra/security depth is decisive ## You will bring Required Competencies • Deep, hands-on expertise in IP routing protocols IS-IS, BGP, MPLS, Segment Routing (SR-MPLS/SRv6), EVPN; multicast a strong plus • Proven track record designing subsystems within a large-scale embedded network OS (IPOS, IOS-XR, SROS, JUNOS, or a disaggregated NOS such as SONiC) • Strong system-design fundamentals: distributed state, scalability, high availability, convergence, ISSU • Working knowledge of platform infrastructure forwarding/data-plane abstraction, silicon abstraction, telemetry, control-plane infrastructure • Solid grounding in network security: control-plane protection, IPsec/MACsec, secure boot, protocol hardening • Ability to translate product/segment requirements into architecture and lead it through to delivery • 10+ years in networking software development, with 3+ years in system design / architecture of routing or platform subsystems • Excellent technical communication and cross-geography collaboration Nice to Have • Experience with cloud-native / containerized NOS and disaggregated architectures • Exposure to AI-native / on-node telemetry-driven operations • Contributions to relevant...