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Varun Singh

Cloud Network Engineer II @ Microsoft | SONiC & AI/GPU Networking | Ex-NVIDIA | InfiniBand · BGP · VXLAN-EVPN | CCNP (DevNet, DCCOR)

Hyderabad

7+ years of work experience

Microsoft
May 20264 mosPresent

Hyderabad, Telangana, India

NVIDIA
Oct 20258 mosMay 2026

Bengaluru, Karnataka, India

• Building and maintaining high-performance DGX Cloud network fabrics connecting AI/HPC clusters across global data centers. • Designing and optimising low-latency, high-bandwidth interconnects supporting distributed GPU workloads. • Implementing automation frameworks (Python, pyATS, Ansible) to validate, monitor, and provision network infrastructure. • Collaborating with software, compute, and storage teams to improve infrastructure reliability, telemetry, and observability. • Working on Infrastructure-as-Code initiatives to standardise configurations and accelerate deployment across DGX Cloud environments. • Enhancing network visibility through telemetry, sFlow, and real-time monitoring pipelines.
Cisco
Dec 20204 yrs 11 mosOct 2025

Bengaluru, Karnataka, India

Specialized in troubleshooting complex data center network issues involving Cisco ACI and the Nexus portfolio (2K–9K), ensuring minimal downtime and high availability. Performed in-depth packet-level analysis using tools like Wireshark and tcpdump to identify root causes of L2/L3 connectivity issues, latency spikes, packet loss, and asymmetric routing. Deals in capturing and interpreting traffic flows to analyze behaviours such as ARP failures, TCP retransmissions, and dropped packets across fabric paths. Diagnosing critical issues involving protocols such as VXLAN, BGP, OSPF, STP, and multicast within multi-tenant ACI environments. Leveraging Python scripting and Ansible to automate config validation, troubleshooting routines, and post-incident remediation workflows. Collaborating with client-side engineers and internal escalation teams during major incident calls to resolve high-impact outages and performance degradations. Documenting findings, packet traces, and mitigation steps for each incident to support knowledge sharing and RCA reports. Delivering proactive support by monitoring fabric health, tracking fault messages, and advising clients on network hardening and operational best practices. Maintaining deep knowledge of Cisco NX-OS, ACI constructs (EPGs, contracts, BD, VRFs), and data center design principles to guide accurate diagnosis and resolution.
Wipro Limited
Oct 20191 yr 2 mosNov 2020

Tamil Nadu, India

• Monitored and maintained the network infrastructure of a large telecom client based in Indonesia. • Performed troubleshooting for production and non-production issues including routing errors, packet drops, and switch failures. • Participated in a cross-functional rotation to gain hands-on experience with routing protocols including OSPF, BGP, and MPLS. • Served as a point of contact for configuration changes, firmware upgrades, and root cause analysis. • Raised and managed tickets via JIRA and coordinated with Cisco TAC for high-severity incidents.

Varun’s AI Stack

antigravity
antigravity
codex
codex
opencode
opencode

Education

AJAY KUMAR GARG ENGINEERING COLLEGE, GHAZIABAD

Bachelor of Technology, Computer Science

AJAY KUMAR GARG ENGINEERING COLLEGE, GHAZIABAD

20154 yrs2019

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Headline

Cloud Network Engineer II @ Microsoft | SONiC & AI/GPU Networking | Ex-NVIDIA | InfiniBand · BGP · VXLAN-EVPN | CCNP (DevNet, DCCOR)

About

Cloud and AI infrastructure network engineer with 6+ years building and operating hyperscale data center and GPU networking environments for Microsoft, NVIDIA, and Cisco. I specialize in the networking layer that powers modern AI compute, from InfiniBand and Mellanox fabrics for GPU clusters to open-source network operating systems like SONiC. At Microsoft, I contribute to SONiC's observability stack, building telemetry pipelines using gNMI, OpenTelemetry, Telegraf, and Kusto to give engineers real-time visibility into large-scale datacenter networks. Previously at NVIDIA, I operated spine-leaf backend fabrics supporting DGX Cloud GPU infrastructure across multi-cloud and edge regions, troubleshooting latency, packet loss, and congestion issues across Arista, Juniper, and Fortinet platforms. Before that, at Cisco, I spent 5 years as a High-Touch Technical Consulting Engineer supporting Tier-0 financial data center networks, designing automation with Python and pyATS to validate protocol health, enforce config compliance, and reduce operational risk at scale. Core strengths: 🔹 AI/GPU networking — InfiniBand, RDMA, spine-leaf/Clos fabrics 🔹 Routing & switching — BGP, OSPF, MPLS, VXLAN-EVPN, IS-IS 🔹 Network OS — SONiC, Cisco IOS-XR/NX-OS/ACI, Arista EOS, Juniper 🔹 Observability — streaming telemetry, OpenTelemetry, SNMP, packet-level analysis 🔹 Automation — Python, pyATS, API-driven validation, Infrastructure as Code CCNP (DevNet & DCCOR) certified. Passionate about the intersection of open networking and AI infrastructure at scale.

Location

Hyderabad

AI stack

antigravity

codex

opencode

Work experience

Cloud Network Engineer II at Microsoft, May 2026 - Present · 4 mos, Hyderabad, Telangana, India

Senior network infrastructure engineer at NVIDIA, Oct 2025 - May 2026 · 8 mos, Bengaluru, Karnataka, India, • Building and maintaining high-performance DGX Cloud network fabrics connecting AI/HPC clusters across global data centers. • Designing and optimising low-latency, high-bandwidth interconnects supporting distributed GPU workloads. • Implementing automation frameworks (Python, pyATS, Ansible) to validate, monitor, and provision network infrastructure. • Collaborating with software, compute, and storage teams to improve infrastructure reliability, telemetry, and observability. • Working on Infrastructure-as-Code initiatives to standardise configurations and accelerate deployment across DGX Cloud environments. • Enhancing network visibility through telemetry, sFlow, and real-time monitoring pipelines.

Senior Network Consultant at Cisco, Dec 2020 - Oct 2025 · 4 yrs 11 mos, Bengaluru, Karnataka, India, Specialized in troubleshooting complex data center network issues involving Cisco ACI and the Nexus portfolio (2K–9K), ensuring minimal downtime and high availability. Performed in-depth packet-level analysis using tools like Wireshark and tcpdump to identify root causes of L2/L3 connectivity issues, latency spikes, packet loss, and asymmetric routing. Deals in capturing and interpreting traffic flows to analyze behaviours such as ARP failures, TCP retransmissions, and dropped packets across fabric paths. Diagnosing critical issues involving protocols such as VXLAN, BGP, OSPF, STP, and multicast within multi-tenant ACI environments. Leveraging Python scripting and Ansible to automate config validation, troubleshooting routines, and post-incident remediation workflows. Collaborating with client-side engineers and internal escalation teams during major incident calls to resolve high-impact outages and performance degradations. Documenting findings, packet traces, and mitigation steps for each incident to support knowledge sharing and RCA reports. Delivering proactive support by monitoring fabric health, tracking fault messages, and advising clients on network hardening and operational best practices. Maintaining deep knowledge of Cisco NX-OS, ACI constructs (EPGs, contracts, BD, VRFs), and data center design principles to guide accurate diagnosis and resolution.

Project Engineer at Wipro Limited, Oct 2019 - Nov 2020 · 1 yr 2 mos, Tamil Nadu, India, • Monitored and maintained the network infrastructure of a large telecom client based in Indonesia. • Performed troubleshooting for production and non-production issues including routing errors, packet drops, and switch failures. • Participated in a cross-functional rotation to gain hands-on experience with routing protocols including OSPF, BGP, and MPLS. • Served as a point of contact for configuration changes, firmware upgrades, and root cause analysis. • Raised and managed tickets via JIRA and coordinated with Cisco TAC for high-severity incidents.

Education

Bachelor of Technology, Computer Science, AJAY KUMAR GARG ENGINEERING COLLEGE, GHAZIABAD

Varun Singh - Cloud Network Engineer II in Hyderabad | Tal