Managed a team building and maintaining over 700 Linux servers. RHEL 5/6/7/8, VMWare ESXi, Ansible, Chef Server/Compliance/Automate, Cfengine, Nagios, Infoblox, Splunk, Tripwire, Jenkins, EMC Networker, Zookeeper, Consul, Redis, NGINX, Cloudbolt, Zabbix

* Rebuilt/Maintained an 80 node multi-colo Cassandra cluster used directly by the ebay.com website.* Tuned the Cassandra cluster to increase read throughput by 5x while decreasing read latency by 10x. Write throughput was increased by 20x.* Setup/Maintained a 48 node multi-master/multi-slave MySQL cluster used directly by the ebay.com website.* Setup/Maintained extensive monitoring and conducted performance and fault analysis for both hunch.com (acquired by eBay) and eBay.* Collected/Monitored/Graphed over 55,000,000 datapoints/day with my own custom written monitoring/graphing software.* Maintained 60 Linux servers across two data centers for hunch.com.* Maintained a multi-colo/multi-master/multi-slave MySQL database for hunch.com.* Provided 24x7 on-call support.

* Designed/Setup/Maintained complete infrastructure solutions for multiple dot.com companies.* Worked closely with developers to design robust applications to take advantage of HA services.* Setups included MySQL, Postgresql, Tomcat, Apache, Memcached, Beanstalkd, PHP, Django, RabbitMQ, Redis, Gitlab, Git, SVN, Ansible, AWS, MongoDB, Solr, Varnish, HA Proxy, Jenkins.* Setup/Maintained extensive monitoring and conducted performance and fault analysis.* Provided 24x7 on-call support.

* Setup/Maintained 60 Linux servers across two data centers.* Setup/Maintained clustered geographic load balancers for hunch.com.* Setup/Maintained a multi-colo/multi-server/multi-slave MySQL database.* Setup/Maintained extensive monitoring and conducted performance and fault analysis.* Provided 24x7 on-call support.* Setup included MySQL, Tomcat, Apache, Beanstalkd, Memcached, Django, Solr, Rsyslog, Git, SVN, Selenium, Jenkins.

* Setup/Maintained 80 Linux servers.* Setup/Maintained clustered load balancers for scanscout.com.* Setup/Maintained multiple master/master and also master/slave MySQL databases.* Setup/Maintained extensive monitoring and conducted performance and fault analysis.* Provided 24x7 on-call support.* Setup included MySQL, Tomcat, Jetty, Apache, Beanstalkd, Memcached, Hadoop, Balance.

* Setup/Maintained 400 Linux servers.* Built out 3 data centers.* Setup/Maintained firewalls and VPNs between the sites.* Setup/Maintained the ServerIron XL Load-Balancers.* Setup/Maintained 36TB of storage on 2 EMC CX3x0 storage arrays.* Load tested and worked with developers to improve application performance. Defined what needed to be added to allow high availability.* Designed a large scale anti-spam/anti-virus system to process all web crawler form-filled emails. It processed over 750,000 emails/day and had spikes to 2 million emails/day.* Provided 24x7 on-call support.* Setup included MySQL, Tomcat, Apache, Memcached, Django, qmail, Balance, NFS, NIS, djbdns.

* 24x7 support for the ASP (Application Service Provider) hosting environment.* Redesigned/Setup/Maintained the production ASP environment – A completely redundant, highly available 3-tiered architecture.* Migrated production applications from a 1-tier to a 3-tiered architecture. * Built Snort IDS boxes for the production environment to help identify attempted security breaches.* Documented all aspect of the production environment – from design, installation, and maintenance, to a complete “bare-metal” DR recovery plan.* Acted as a liaison between Operation and Development groups.* Implemented non-production backups with Amanda backup software on a 3TB storage array.* Setup/Maintained the ASP customer’s Oracle databases.

* Provided 24x7 on-call support for a financial company which managed in excess of $360 billion/year.* Helped setup/maintain the largest Fujitsu computers in the United States (Prime Power 2000 and 2500) running Solaris 2.8.* Helped setup/maintain the production and stage Veritas Cluster Servers.* Helped redesign the Solaris infrastructure which included standardized OS builds, patch management, account management, and security.* Performed system and application performance analysis using BMC BEST1, SE Toolkit, Sar, BMC Patrol.* Rewrote the NOC from scratch, replacing the existing NOC which had been a culmination of three years of dedicated work.* Implemented a corporate wide SUDO installation and access procedure.

* Setup/Maintained 20 Sun Servers (Enterprise 220's up to Enterprise 4500's.)* Setup/Maintained the development and production environments. The production environment was 100% HA.* Lead troubleshooter for performance, OS, network, and dial-up issues.* Setup/Maintained 5 Linux Servers.* Setup/Maintained the Windows 2000 domain controllers.* Maintained the Microsoft Exchange Server and 5 file servers.* Maintained both production Cisco PIX and Check Point Firewall-1 firewalls.* Wrote a server and agents to monitor all UNIX machines services (Oracle, Faxing, FTP, HTTP, SMTP, DNS, Disk space etc.)* Automated nightly builds.

* Twice I won Houghton Mifflin's "STAR" award for excellence.* Setup/Maintained a Sun Enterprise 10000.* Maintained 80+ Solaris Servers for 3000+ users nation wide.* Managed a group of 4 Systems Administrators.* Upgraded machines to Solaris 2.6 or higher.* Designed/Setup/Maintained the scripting standards.* Completely redesigned and rewrote the NOC. * Created graphs of system resource utilizations for review by internal divisions.* Split production and development into separate environments.* Performed system tuning on production machines, reducing CPU utilization by 50% and disk access times by 40%.* Provided 24x7 on-call support.

* Connected companies to the Internet (28.8/Fraction T1/ISDN).* Setup Web servers (Apache).* Setup Firewalls (Packet filtering, TIS, and NAT).* Setup Mail Servers (Sendmail, IMAP, POP3).* Setup Mail Gateways (TenFour Groupwise/SMTP Gateway/UUCP).* Setup Mac/PC Fileservers (SAMBA, NFS, Netatalk).* Wrote custom CGI's for clients.* Wrote custom Java applets that interfaced with Sybase and mSQL (not MySQL).