Aaron Koli

•Managed and optimized data center network infrastructure, overseeing 500+ network devices, including routers, switches, firewalls, and load balancers. •Implemented and maintained structured cabling solutions, successfully handling over 1,000 fiber and copper connections, ensuring seamless network performance. •Resolved network incidents and service requests within contractual SLA timelines, reducing downtime by 35% through proactive monitoring and troubleshooting. •Collaborated with cross-functional teams and vendors to support new installations, capacity planning, and break-fix operations for network and server infrastructure. •Performed network hardware lifecycle management, including racking, stacking, decommissioning, and break-fix, ensuring operational stability and scalability.

•Monitored and analyzed over 1000 security events daily using SIEM tools like Splunk, reducing false positives by 40% through fine-tuned detection rules. •Investigated and responded to security incidents, correlating logs across multiple sources to mitigate threats and reduced mean time to detect (MTTD) by 30%. •Collaborated with IT, engineering, and stakeholders to enhance security controls, leading to a 25% increase in remediation efficiency. •Led threat intelligence efforts, identifying vulnerabilities and implementing proactive defenses that decreased security breaches by 35%. •Supported security audits and compliance assessments, ensuring adherence to industry regulations and improving overall cybersecurity posture.

Client: Citibank •Orchestrated the analysis of vulnerability finding of various applications which helped the customers to get clear, consistent, and impactful insights of the information security analysis of the affected hosts. •Responsible for reported metrics, including detection and use of various available inventories and scan results, data modelling, processing, calculating and transformation into meaningful metrics and reports. •Built and maintained strong working relationships with IT engineering, Operations, and other Stakeholders to remediate Information Security and/or Vulnerability Finding which increased the efficiency of remediation by 20%. •Coordinated and lead vulnerability management forums with operations and engineering leads as required to resolve outstanding/pending issues before requiring further escalation. •Escalated issues appropriately and in a timely fashion with general management supervision and supported the organization through internal and external audits of the various processes and procedures in use which led to increase in solving the issues by 30%.

•Performed Vulnerability Assessment & Penetration Testing on company’s PAM software product using tools like “Burp Suite” which lead to detection of XSS, MitM, SQLi, DOS and created security audit reports to help understand the threat landscape to the developers. •Configured SIEM software such as “Splunk”, managed system logs, events and created dashboards of the existing logs for a third-party client application which thereby increased the enterprise visibility up to 68%. •Performed risk analysis and achieved 83% safer privileged access to various devices by working on Privileged Threat analytics which comprised of monitoring various devices for any suspicious activities like Identity theft, Leapfrogging, Privilege Account abuse. •Played an instrumental role in creating and modifying Optimization and Performance Tuning scripts for Windows Server 2012 and Windows server 2016 which increased the performance of the servers by 30%. •Under the supervision of the CTO, demonstrated the Pass-the-Hash attack on the configured network using mimikatz post exploitation tool which helped developers understand the attack and effectively deploy preventive measures. •Documented the technical manual for company’s PAM software solution using Atlassian Confluence which consisted of various technological concepts and procedures to efficiently run the software product which helped the clients to clearly understand the software product, the functionalities and included a troubleshooting section for assistance in case of a problem. •Trained a team of interns and helped them understand the PAM software product with the help of technical manual and presented the importance of OWASP top 10 vulnerabilities and CWE top 25 vulnerabilities.