Senior teaching assistant for training software engineering students in Ruby, HTML, JavaScript, and SQL. Curriculum development.

Maintained operating systems and applications software for 10 servers supporting community, web, and email users. Administered Linux (CentOS/Redhat, Fedora Core), Solaris, and FreeBSD servers. Maintained security by keeping software up to date, applying patches, configuring firewalls, eliminating unneeded services, and monitoring system logs and changes. Monitored system performance. Performed system backups and ensured reliability. Provided reports, technical advice and guidance to management. Communicated directly with customers regarding changes, maintenance periods, and other issues. Achievements include:* Planned and executed transitions from bare-metal systems to VMWare-based data center machines and, later, to Amazon's Elastic Compute Cloud (EC2).* Conducted several operating system transitions from Solaris and FreeBSD to Fedora Core Linux, and later to CentOS (Redhat) Linux, including porting of applications.* Re-architected billing, registration, and user provisioning systems to use Aria Systems software (SaaS) with REST techniques.* Redesigned and implemented our customer email system, replacing an antique command-line and POP system with a modern Web- and IMAP-based system, while providing an interim cutover period to minimize disruptions to our 3000 email customers.* Improved system and user security by eliminating unencrypted/insecure protocols such as Telnet, FTP, and HTTP to encrypted/secure protocols like SSH, SCP/SFTP, and HTTPS.* Converted a static, inconsistent web site to one that used a consistent design with dynamic content that could be maintained with the Mason-CM Content Management System.* Adapted conferencing software for use on mobile devices

Designed, developed, implemented, and maintained applications software for approximately 7500 users on Dynix and Solaris systems. Controlled system access by maintaining system logins and passwords, and monitored system for unusual activities. Served as technical liaison between customer support staff and system administrators, answering questions and providing assistance when possible. Special projects and events included:* Designed, developed and maintained customer registration and billing data application* Ported applications software between from Dynix to Solaris.

Performed various customer support and programming tasks as required. Wrote the customer user manual. Answered customer support emails and forum-based questions. Hosted the Wellcome forum for welcoming new customers to the system. Developed small utility programs for both customer support staff and customer use.

Maintained multiple MVS virtual machines on a high priority military intelligence system. Performed database administration for multiple Model 204 database instances. Controlled system access and security for both the OS and database software. Applied system and software patches. Monitored performance.

Provided guidance and programming support for a migration from Univac systems to IBM hardware running VM/370.

Installed and maintained MVS operating system software. Controlled system access and security. Administered Model 204 database system. Provided guidance and assistance for database software developers.

Provided hardware and software technical support to USAF small computer users throughout Europe. Provided classroom training in use of Cromemco Cromix, MS-DOS, and dBase II. Developed and maintained a library of free software that could be installed on USAF/Europe computers.