Eric O'Callaghan Email & Phone Number

Philadelphia, Pa, Us

Philadelphia, Pa, Us

Penn EngineeringSchool of Engineering & Applied Science (SEAS)Computing and Educational Technology Services (CETS)

San Francisco, California, Us

- Leverage monitoring and alerting tools including Nagios/Thruk, Splunk, New Relic, and Grafana in tracking down sudden issues- Implement and use various internal HTTP JSON APIs to automate generation of reporting information for numerous large banking partners- Perform root cause analysis of incidents, while constantly improving and iterating on processes

Philadelphia, Pa, Us

- Operations team member within the Next Generation Access Network (NGAN) department triaging incidents surrounding the national virtual cable modem termination system (vCMTS)- Primarily responsible for quickly determining the cause of any service disruption/interruption for both residential and business customers across the nationwide Comcast footprint of rapidly-deployed vCMTS installations- Worked with and deployed Hewlett-Packard (HP), Opengear, Cisco, Arista, Juniper, and Harmonic software as well video and network hardware, while regularly maintaining vendor relationships

Philadelphia, Pa, Us

- Assisted a small team in maintaining the configuration, reliability, and security of approximately 500 very unique Linux servers which hosted research, medical, pharmaceutical and academic data for the hospital and university- Managed VMware data stores, volumes, and virtual machines on network storage regularly- Deployed SolarWinds monitoring agents throughout the infrastructure, primarily on Red Hat Enterprise Linux versions 6 and 7

Philadelphia, Pa, Us

- Performed configuration management by writing Ansible roles and playbooks that I ran on nearly 1,000 CentOS servers which hosted one of the top five largest Splunk installations in the world- Modified sysctl network and disk I/O settings to utilize servers more efficiently- Set up a Zabbix cluster which monitored over 800 physical Hewlett-Packard (HP) hosts and was used to automatically detect hard disk drive failures before they caused any service interruption- Created a variety of complex Apache configurations to fit within internal network security guidelines, including implementation of client-certificate authentication as well as reverse proxies- Regularly tested TCP/IP connectivity between different VLANs, networks, and data centers throughout the country which required opening JIRA tickets to request firewall changes that I would then validate were completed successfully- Ensured consistency of firewall rules as well as server and network settings across hosts in thirty different data centers

Philadelphia, Pennsylvania, Us

- Being the sole systems administrator for the company, my primary duties included response to any infrastructure issues as well as responsibility for all server modifications and yum/apt updates- Maintained multiple database environments that included MySQL replication between co-located Dell and HP hardware, running Ubuntu, and Amazon Web Services (AWS)- Wrote and tested documentation on the processes necessary to restore internal Percona XtraDB database backups- Created and open-sourced a Bash shell script that instantly forwards Zabbix alerts to Slack, which I am proud to say is now used by many members of the Zabbix and Slack online communities- Automated deployment of in-house PHP application via “chatops”. In efforts with a co-worker, we set up RunDeck to trigger requests to the Ansible Tower API allowing quick and easy deployment at any time from our teams shared Slack chat

Philadelpia, Pa, Us

- Worked with a team to migrate UrbanOutfitters.com and Anthropologie.com from third-party managed services to in-house physical Solaris and RedHat servers- Performed racking, cabling, and physical installation of HP servers within the on-site datacenter- Maintained Apache configurations which proxied web requests to clustered JBoss instances- Deployed internal DNS resolvers within the e-commerce network to improve response times for all website visitors and transactions while also enhancing network security- Used Zabbix JMX monitoring to graph HTTP request and response times

Philadelphia, Pa, Us

- Provided quick and helpful technical support to a significant number of customers via telephone, e-mail, and support tickets which involved troubleshooting a wide variety of issues including routing inconsistencies between multiple international data centers

Hampton, Virginia, Us

- Created multiple, interactive web applications using PHP and MySQL which eased the management of data for both the Lead Web Developer and Human Resources department- Helped set up a small, on-site datacenter as the company moved to a new office location

Arlington, Virginia, Us

- Enjoyed management of information technology in a government facility (Department of Defense / U.S. Army) while assisting both the Network Team and Help Desk as a temporary summer hire- Introduced to a large network, spanning the military installation, which required routine installation, maintenance, and configuration of Cisco equipment