Development, maintenance and tuning of regular expression spam-detection rules and analysis service code framework for the open-source Apache SpamAssassin e-mail anti-spam utility.Co-administration of the Apache SpamAssassin project as one of thirteen Project Management Committee members.Apache Software Foundation committer.

Design, development, testing and documentation of Linux kernel modifications to support masquerade (NAT) of PPTP and IPsec VPN traffic in the 2.0.x and 2.2.x kernel series.Design and development of e-mail and firewall security tools in the GNU/Linux and POSIX environments.DNS, website and secure e-mail management.Consulting on Linux system administration and security, networking administration, VPN technologies.

Designed, developed, maintained and supported retail customer relationship management application suite used by Buckle, Build-a-Bear, Carters, Christopher and Banks, Cole Haan, Famous Footwear, Grupo Axo, Michael Kors and many other large and high-end retail brands in multiple countries. Received praise from colleagues and a company award for technical skills, mentoring and colleague training. Received praise from clients for quality and responsiveness of escalated issue support.* Corporate "fat client" retail application, frontend Winforms UI and backend service development in C#* RESTful retail webservice development in C# and ASP.NET Core* RESTful retail microservice development in Typescript with Node.js* RESTful webservice quality assurance using Postman, including developing database-driven test automation* RESTful webservice performance testing, analysis and tuning* Utilization of Agile/Scrum development processes* Design of large (20+ million customer, multiple hundred million transaction) retail customer relationship management database* Application design and technical advisory consultation with business analysts and project managers* SQL query and stored procedure development and performance tuning for SQL Server 2000 - 2019* Business report development using SQL Server Reporting Services and SAP Crystal Reports* SQL Server 2000 - 2019 DBA* Colleague consultation, support, training and mentoring at all skill levels* Client consultation* Escalated issue support for databases and applications at client sites* Support of client heritage systems using Informix (through IDS10) and Oracle (through 9i)

* Administration of POSIX (GNU/Linux, SCO Open Server) and Windows (98, XP, 2000) desktop and server network supporting corporate office users and telecommuters and hosted e-commerce web sites* Corporate network Internet access and security design, tool development, and management* Support and training of corporate users and Development and Customer Support departments* Security, network, Internet and VPN consulting, design, implementation and support for clients* Informix (through IDS10) and SQL Server DBA and database architect* Escalated support for client database issues* Retail Business Intelligence and ETL design and development using SQL Server Analysis Services and SQL Server Integration Services* Retail application development in C# with Oracle 9i and SQL Server 2000* Retail application development in Informix 4GL with Informix procedure language* Utility application development in C* On-site installation, configuration and support of servers, network infrastructure, databases and custom application software for clients

* Co-administration of Windows NT (3.51, 4.0, Terminal Server) and Unix (GNU/Linux, SCO, SVR4) wide-area network of more than 50 locations serving more than 200 users across four states* Development, documentation and maintenance of, and user training and support for, accounting, payroll, cash management, communications, e-mail automation, corporate intranet, and restaurant management, analysis and support applications and databases* Design, development, documentation, installation and maintenance of, and user training and support for, restaurant management, full-service and cafeteria style Point-of-Sale, e-mail, intranet, communications and support applications, databases and systems in more than 40 restaurants in four different concepts across four states, connected by dial-up, WAN and Internet VPN* Internet access and security design, tool development, and management

Tutored lower- and upper-division Computer Science 20 hours a week while attending classes full-time and while working part-time after June, 1987.