My Resume
DENNIS DUFFNER
18121 School Street, Lansing IL 60438
708-895-1841
dduffner@gmail.com
Systems Administrator experienced in iSeries, Windows and Solaris10
Summary
15+ years of system administration experience in the iSeries (AS/400) field. Strong background in user training and support documentation. Experienced in hardware and software management as well as various packages for the iSeries. Extensive experience with Windows XP, 2003 Server, Solaris 10 on both x86 and Sparc platforms.
Professional Experience
Harvey Public Library District 2004-2006
Systems Engineer
* Managing support for network of 50 staff and public access computers as well as Solaris 9 and 10, Windows 2000 and Windows 2003 servers.
* Handle trouble calls for external clients (1500 dialup users, other libraries, etc.)
* Built, configured and maintain media server to allow external clients to view media files on different subjects.
* Researched and recommended tools and utilities for analysis of radius server logs to assist in determining if users had contracted a virus and to safeguard the library’s network.
* Researched and determined cause of notices from external services of dialup users causing attacks on other systems.
* Responsible for system security for all Sun and Windows servers.
* Installed, configured and maintain discussion forum software on Solaris 10 server, including Apache, MySQL and PHP.
* Installed, configured and produced podcasts for the Library detailing the programs of the various departments on a monthly basis.
* Edited scripts for manipulating the LDAP database for adding, removing and changing various parameters for the dialup users to conform with Solaris 10.
Connamara Systems, Chicago IL 2004
Consultant
* Performed SOX work for a client. Project lasted one month.
Bear Stearns & Company, Chicago IL 2000-2004
Production Control Specialist
* Investigated and recommended corrective actions for issues arising from previous days operations.
* Investigated and coordinated remediation of user issues for both internal and external clients
* Designed and coded programs to improve performance in various areas of the company.
* Evaluated, implemented and supported third party security software for network of 11 AS/400s, serving as contact person with vendor (NetIQ’s VSA).
* Maintained security for network of 11 AS/400s
* Investigated and recommended options for use of iSeries Navigator for monitoring of systems.
* Converted all file transfers to and from AS/400s from token ring using NDM via mainframe to TCPIP using FTP.
* Created automatic handling of client downloads for the FIX system.
Tech Edge, Darien IL 1999-2000
Consultant – Temp
* Coordinated Y2K testing of applications for Bear Stearns, assisting with testing on weekends and assisting in resolution of issues with clients.
* Investigated operational issues for both internal and external clients
Interactive Business Systems, Oak Brook, IL 1998-1999
Consultant – Temp
* Fuji Futures – performed system admin functions for the firm, maintained their AS/400s and handled user issues.
* Participated in moving Fuji’s AS/400s from branch office to main office.
* Kraft Foods – Various tech support issues for the company.
Education
Undergraduate studies at South Suburban College, with majors in Business and Public Safety
Cobol and System Operations classes @ IBM-Chicago
Certifications
Microsoft Office 2003 Administration – Brainbench
Windows XP Desktop Administration – Brainbench
Systems Proficiencies
Operating Systems: OS/400 up to V5R2, MS Windows 3.1-XP, Mandriva Linux 2007, Solaris 9 (Sparc and x86), Solaris 10 (Sparc and x86)
Hardware: IBM iSeries 7xx and 8xx with LPARs, Sun x86 and Sparc platform
Programming Languages: CL/400, Query/400, SQL/400, Cobol/400, ksh, bash
Software Packages: VSA for iSeries by NetIQ, FIX, LXI Tape Management, Aldon Chg Mgmt, Reveal Job Scheduler, Apache2, MySQL, PHP5, network analysis software for Solaris
PC Software: Microsoft Office XP and 2003, Star Office (Unix), Rumba (AS/400 Terminal Emulation), iSeries Navigator, Visio 2003 as well as other business and network packages.
