Software Engineer | Cloud Native BNG Solution Testing, Scale & Performance, Python | 8-12 year
Cisco15 hours ago
Bengaluru, IndiaSenior / Staff+
Responsibilities
- Design and implement end-to-end cnBNG solution testing across control plane, user plane, subscriber management, forwarding, platform infrastructure, and external network elements.
- Own subscriber-scale, session-churn, throughput, latency, packet-loss, convergence, resource-utilization, performance, stress, longevity, capacity, and resiliency qualification.
- Design realistic broadband network topologies and traffic profiles covering IPv4/IPv6, QoS, subscriber protocols, service policies, and customer workloads.
- Use Keysight IXIA and Spirent platforms for subscriber emulation, protocol emulation, traffic generation, traffic analysis, benchmarking, and large-scale execution.
- Validate CUPS control-plane/user-plane separation, state synchronization, failure recovery, high availability, ISSU, NSR/NSF, and subscriber session continuity.
- Validate IOS-XR forwarding, MPLS/L3VPN, QoS, ACLs, mirroring, OAM/BFD, slowpath, and NPU behavior.
- Develop reusable Python test automation with pyATS/Genie or equivalent frameworks and integrate it into CI/CD and regression pipelines.
- Analyze performance trends and isolate root causes across software, forwarding hardware, NPUs, CPUs, memory, traffic generators, automation, and external network components.
- Debug issues using logs, traces, telemetry, packet captures, core dumps, traffic-generator statistics, and platform diagnostics.
- Define test exit criteria and provide evidence-based release-quality and readiness recommendations.
- Collaborate with development, platform, architecture, and customer-facing engineering teams to reproduce and resolve defects.
- Use Git and approved AI coding assistants for automation development, test generation, log analysis, failure clustering, and troubleshooting.
- Mentor junior engineers and improve testing methodology, automation architecture, scale infrastructure, and engineering quality.
Requirements
- Bachelor’s or master’s degree in Computer Science, Electrical or Computer Engineering, Telecommunications, or a related field.
- Strong experience in system, solution, scale, performance, and resiliency testing of networking products or carrier-grade networking solutions.
- Hands-on expertise with Keysight IXIA and/or Spirent traffic-generation platforms, including protocol emulation, subscriber emulation, scale testing, and performance analysis.
- Strong Python programming and scalable test-automation experience using pyATS/Genie or equivalent frameworks.
- Experience integrating automated test suites into CI/CD and continuous regression pipelines.
- Strong IP networking fundamentals, including L2/L3 forwarding, IPv4/IPv6, routing, MPLS/L3VPN, and QoS.
- Knowledge of PPPoE, IPoE, DHCPv4/v6, PPP, RADIUS/CoA, and L2TP broadband and subscriber technologies.
- Experience configuring, validating, and troubleshooting IOS-XR or another carrier-grade network operating system.
- Ability to design large-scale network topologies and characterize capacity, throughput, latency, convergence, resource utilization, and failure recovery.
- Strong understanding of high availability, subscriber-state management, duplication, and fault-recovery mechanisms.
- Strong Linux skills and experience with Git, debugging tools, packet collection, logs, telemetry, and defect-management systems.
- Strong analytical and problem-solving skills across traffic generators, protocols, software, hardware, and forwarding layers.
- AI-assisted engineering experience using tools such as GitHub Copilot, generative AI, AI agents, MCP, reusable AI skills, prompt/context management, and responsible output validation.
- Preferred experience with cnBNG, BNG, broadband subscriber solutions, CUPS, distributed user-plane deployments, Cisco 8000, ASR 9000, NCS 5500/5700, Silicon One, NPUs, SRG geo/warm standby, ISSU, NSR/NSF, service continuity, SRv6, Segment Routing, EVPN/VPLS, TE/GRE tunnels, BGP Flowspec, YANG, gRPC, NETCONF, gNMI, OpenConfig, telemetry, performance dashboards, test-result analytics, and Aha/Jira APIs.
About Cisco
Cisco designs and sells networking, security, and collaboration platforms for enterprises, service providers, and governments, spanning routers and switches, Wi‑Fi, firewalls, zero‑trust, observability, and cloud-managed IT (Meraki) plus Webex. Its business model mixes hardware, software subscriptions, and support/consulting services. Founded in 1984 and headquartered in San Jose, California, Cisco is a public company traded on Nasdaq and serves customers across data centers, campuses, and service provider networks.