Purna Naga Sai Kakumanu
Network Engineer @AT&T
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WORK HISTORY
Network Engineer @AT&T
Dallas, TX, US
Designed and deployed BGP peering and MPLS L3VPN services on Cisco ASR 9K and NCS 5500 routers, supporting the addition of 200+ new enterprise customer connections annually while maintaining 99.99% service availability. Led the migration of legacy backhaul infrastructure to Segment Routing (SR-MPLS) across 300+ network devices, improving network resiliency and reducing path computation complexity by 35%. Developed Python automation scripts using Netmiko and NAPALM to automate configuration backups and compliance audits for 400+ network devices, saving approximately 10 engineer-hours per week in manual tasks. Implemented EVPN-VXLAN fabric in data center environments to enhance network segmentation and reduce convergence time during link failures from 5 seconds to under 500 milliseconds. Troubleshot complex OSPF, ISIS, and BGP routing issues in a 24/7 service provider environment, restoring service connectivity with a mean time to repair (MTTR) of under 45 minutes. Configured and maintained CGNAT/LSN infrastructure to manage IPv4 address exhaustion, supporting over residential subscribers with high availability. Implemented QoS policies and traffic engineering to prioritize 5G low-latency services, resulting in a 15% reduction in jitter for mobile video traffic. Collaborated with security teams to deploy MACsec encryption on metro aggregation links, ensuring data confidentiality for enterprise customers. Maintained comprehensive network documentation including HLD, LLD, and MOPs in Confluence and ServiceNow, ensuring 100% compliance with change management policies.
EDUCATION
KKR&KSR Institute of Technology & Sciences, VINJANAMPADU Village (CC-JR)
Bachelor of Technology - BTech, Civil Engineering
Virginia University Of Science & Technology
Master's degree, Cyber/Computer Forensics and Counterterrorism
Sri Chaitanya College of Education
high school degree , General Studies
ABOUT PURNA NAGA SAI KAKUMANU
Network Engineer with 4+ years of experience optimizing service provider networks for Tier-1 operators. Proven expertise in multi-vendor environments (Cisco, Nokia, Juniper) driving 5G transport deployments and network automation initiatives. Reduced manual configuration errors by 40% through Python/Ansible scripting while maintaining 99.99% core network uptime. Seeking to leverage deep knowledge of MPLS, Segment Routing, and cloud networking to enhance network reliability and performance.
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