Patrick Callahan is a Network Engineer at Yahoo. He possess expertise in active directory, windows server, cisco technologies, servers, network administration and 19 more skills. Colleagues describe him as "I would highly recommend Patrick for any position that requires expertise in network engineering. I have had the pleasure of working closely with Patrick over the past several years, during which time he has consistently demonstrated his exceptional work ethic and professionalism Patrick a wide breadth of experience across nearly all facets of network engineering. He possesses a deep, aggregate experience in network configuration, operations, and security. He has a deep understanding of data center operations and is highly skilled in the configuration, operation, and troubleshooting of L1, L2, and L3 protocols across multiple vendors. While I have worked with Patrick for close to ten years, I have had the privilege of being his direct manager since 2019. Over the last five years, Patrick's multi-faceted experience has been invaluable to our team. He accepts tasks without hesitation and has repeatedly demonstrated the ability to drive global-scale projects through every phase of the project life cycle. One of Patrick’s many standout qualities is his ability to design and implement complex network solutions, and he has a proven track record for the same. This includes everything from initial design and configuration to ongoing operation and troubleshooting. Among his most notable projects was the overhaul/upgrade of a global OOB network wherein Patrick scoped the project, ensured delivery of related hardware across the globe, redesigned the connectivity schema to align with architectural standards, and worked to ensure that each of the sites was properly monitored ( which was simply NOT the case prior to Patrick's work ). Patrick regularly collaborates with teams across the globe, often working well into the early morning hours in order to align with the schedules of partners in various geographic regions ( EU, Asia, SA, etc. ), and he regularly demonstrates a "network security first" mindset when designing/building topologies. He has even authored security-centric procedures that remain in use today. In addition to Patrick's technical skills, he is an exceptional team player and a natural leader. He has worked to mentor junior engineers, has contributed to the continuous improvement of our operations, and has volunteered his time to build/deliver trainings to the team that have proven invaluable to the team's daily work. I have no doubt that Patrick would be an asset to any organization fortunate enough to have him on their team. Patrick's technical expertise, combined with his 'team first' mentality and unwavering dedication to a job well done, make him an ideal candidate for any role in network engineering." and "I highly recommend Patrick Callahan as a network engineer/operator. Throughout our time working together, Patrick has consistently demonstrated exceptional technical expertise, problem-solving abilities, and a strong work ethic. His deep understanding of network infrastructure and security protocols, combined with his hands-on experience, make him an invaluable asset to any team. Patrick approaches every project with a commitment to excellence. His attention to detail and dedication to staying current with industry developments allow him to deliver innovative solutions that meet both current and future needs. Patrick is an excellent communicator and a true team player. He is always willing to share his knowledge and collaborate across departments to ensure seamless operations. I am confident that Patrick will continue to excel in any network engineering/operation role. Any organization would be fortunate to have him on their team."