Reethika Sajja

Sr Network Security Engineer @UnitedHealth Group

NY, US

Successfully implemented and configured Cisco (2504, 4404, 5508) and Aruba Wireless Controllers, along with Aruba Access Points, to provide secure and seamless wireless connectivity across corporate campuses. Worked extensively with Cisco Identity Services Engine (ISE) to provide 802.1x-based authentication using PEAP and EAP-TLS protocols. I helped define and monitor user roles and access privileges, enabling secure, policy-based network access for corporate users and guests.Engineered and implemented Palo Alto PA series (PA-500, PA-3060, PA-5060, PA-7050, PA-7080) and Fortinet FortiGate firewalls (models 60C/60D/100D/200E HA), with full UTM suite features including App Control, Web Filtering, Intrusion Prevention System (IPS), DoS/DDoS protection, and Antivirus. Ensured proper placement in network zones and optimal policy enforcement. Managed and fine-tuned Cisco Firepower NGFW policies to balance performance with robust threat detection. Enabled features like URL filtering, file inspection, and advanced malware protection (AMP). Optimized Access Control Policies (ACP) for traffic segmentation and resource prioritization. Configured Firepower’s IPS capabilities and implemented SSL/TLS decryption to inspect encrypted web traffic—crucial for detecting hidden threats like command-and-control callbacks and phishing payloads within HTTPS sessions.Python Automation: Developed Python scripts using Netmiko and REST APIs to automate firewall rule audits, parse configuration files, and validate compliance against baselines. This significantly reduced the manual effort required during access review cycles.AWS Security Automation: Automated the provisioning and hardening of cloud resources. Configured Security Groups, Network ACLs, CloudTrail logs, and AWS Config to monitor drift and enforce compliance. Integrated Palo Alto VM-Series firewalls in hybrid environments.