Service Administrator

Gabrielle K. Singleton

*****@*****.***

OBJECTIVE

Seeking a challenging position where my troubleshooting skills and breadth

of knowledge can make a meaningful contribution to the success of the team

and organization.

EMPLOYMENT

2005-present Linux Systems Administrator University of Michigan

Develop, deploy and maintain large-scale high-availability

centralized Email infrastructure (storage and routing) and

supporting services in higher ed. environment. Develop and

automate procedures (with radmind, bash and perl), create

documentation, and mentor junior staff. Responsibilities

focus on 80,000+ user replicated Cyrus IMAP store and email

gateway accepting 10 million messages per week.

2000-2005 Unix Systems Administrator University of Michigan

Production support for Solaris and Linux-based services

including oncall, deployments and upgrades, and supervised

project work. Services include email, spam filtering,

openLDAP directory, DNS, DHCP, distributed CUPS printing,

radmind and monitoring.

1998-2000 Windows System Administrator University of Michigan

Support and maintain loadset for approx. 1,000 Windows

desktops distributed across 37 sites. Update base image,

package software, automate update processes.

MAJOR ACCOMPLISHMENTS

< Led migration of PHP/MySQL webmail applications onto IMAP replica

hardware to leverage idle cycles and improving redundancy for the

service. Enabled 15 dedicated webmail machines to be decommissioned,

saving power, cooling and replacement costs totaling ~$80,000-

$100,000.

< Created process for load testing hardware, RAID and filesystem

configurations for evaluating and tuning Email servers to maximize

performance and reliability.

< Participated in the core team for simta, a full-featured LDAP-

integrated MTA; including direct communication with primary developer,

describing desired features, testing new releases and vetting logging,

documentation and other usability features. Designed and scripted

system to gather detailed performance metrics for multi-domain gateway

running the simta MTA.

< Collaborated with team of admins, developers, UI experts and support

staff to evaluate, customize and roll-out an updated webmail interface

and self-service user email restore capabilities.

< Organized and largely executed the live migration of over 70,000 IMAP

users from Cyrus 2.2 to the fully replicated Cyrus IMAP 2.3

environment. Created and scripted process to automate ongoing

maintenance user moves.

< Developed central Bayesian filtering system for campus IMAP

installation with shared update capabilities; reduced inbox spam over

90% for opted-in users.

MAJOR ACCOMPLISHMENTS(cont)

< Migrated several email subdomains (e.g. @engin.umich.edu) responsible

for over 60% of on-campus traffic to the central email gateway,

reducing load on the gateway servers, cost to the department and spam

to the users; collaborated with departmental technical staff to ensure

a seamless transition for users.

< Successfully leveraged detailed email gateway statistics to persuade

vendor to reduce anti-spam RBL price by 80%, saving over $25,000 per

year.

< Collaborated on development and rolled out a 'smart greylisting' spam

filter, reducing spam received on campus by at least 60% with minimal

impact to legitimate mail.

< Participated in early development of radmind (radmind.org) and ongoing

use of this tool to maintain core infrastructure at University of

Michigan IT Central Services.

TECHNICAL SKILLS

< Linux system administration: building packages and kernels from

source, evaluating software, assessing and responding to security

announcements. Familiar with Gentoo, Redhat, Solaris, Linux from

Scratch

< Operating System management, automation and monitoring: radmind setup

and maintenance; network, service, log and process monitoring

< Email routing, delivery and storage: replicated cyrus IMAP with

murder, simta, sendmail, bind DNS, openLDAP, RBLs, spam & virus

filtering, DSPAM, clamav, TSM backups, TLS/SSL, iptables, Cisco ACE

Modules

< Web application support: Apache, PHP, MySQL

< Scripting & programming: bash shell scripting, perl, C

< Collaborating with developers: designing features, alpha and beta

testing, isolating and reproducing bugs, writing and editing

documentation

ORGANIZATIONAL SKILLS

< Planning, developing, implementing and updating secure, reliable

infrastructure services in a high availability environment.

< Designing strategies to gather use and performance metrics for a

variety of services.

< Mentoring junior staff, documenting organizational procedures and best

practices.

< Hiring process: review and pre-interview candidates - recommend

candidates for interviews, develop interview questions and participate

in selection process

< Interaction with and training of 2nd and 3rd level support staff

< Clear user-level communication for announcements and documentation

EDUCATION

2010 BA Anthropology University of Michigan, Ann Arbor

[coursework completed, graduation 5/2010]

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