Denis Callinan
McLean,VA
Summary
Dedicated Systems Administrator with 29 years of experience in software implementation and maintenance. Proven history of managing complex infrastructures and data center operations. Expert in solutions-oriented business application problem-solving and dedicated to providing best-in-class service. Skilled at troubleshooting, communication and collaboration. Reliable System Administrator provides 24/7 oversight of valuable data and technological assets. Trusted to safeguard cybersecurity, employee privacy and business continuity. Serves as first line of defense against technical interruptions and unwanted intrusions.
Overview
15
15
years of professional experience
Work History
System Administrator
Unison Software Systems
01.2018 - Current
- Enhanced system performance by optimizing server configurations and implementing regular updates.
- Reduced downtime by proactively identifying and resolving potential issues through thorough system monitoring.
- Improved security measures by conducting vulnerability assessments and applying necessary patches.
- Collaborated with IT team to develop and implement comprehensive disaster recovery plans, ensuring minimal data loss during critical incidents.
- Provisioned new software and hardware for use, following established security policies.
- Resolved issues and escalated problems with knowledgeable support and quality service.
- Planned and implemented upgrades to system hardware and software.
- Devised scripts and automation tools to improve system efficiency.
- Analyzed complex project server issues and worked on large enterprise and business-critical applications.
- Completed reports detailing network and systems performance and downtime issues.
- Installed important security and functionality patches to maintain optimal protections against intrusion and system reliability.
Sr Desktop Support
FedBid Inc
01.2015 - 01.2018
- Enhanced system performance by troubleshooting and resolving software, hardware, and network issues.
- Streamlined IT support processes for quicker response times and improved user satisfaction.
- Deployed and maintained desktop systems to ensure optimal functionality and minimize downtime.
- Provided comprehensive technical support for users, addressing various issues related to computer systems, peripherals, and applications.
- Managed MS Exchange and Hosted Email. Responsible for email hygiene and email deliverability and email reputation.
- Administrator of W2K servers (AD/file/print)
- Managed MS licenses and software renewal and purchases
IT Manager
FedBid, Inc
01.2009 - 01.2015
Education
Bachelor of Science - Biology (Chemistry And Fine Arts Minor)
Fairfield University
Fairfield, CTSkills
- Technical Solution Development
- Patch Management
- Hardware and Software Installation
- End Point Configurations
- System Upgrades
- Windows Administration
- Application Support
- System Troubleshooting
- Technical Troubleshooting
Accomplishments
2020 - Individual Contribution Service Excellence
Timeline
System Administrator
Unison Software Systems
01.2018 - Current
Sr Desktop Support
FedBid Inc
01.2015 - 01.2018
IT Manager
FedBid, Inc
01.2009 - 01.2015
Bachelor of Science - Biology (Chemistry And Fine Arts Minor)
Fairfield University
Similar Profiles
ROSEMARIE CORROROSEMARIE CORRO
Assistant Product Manager at UNISON COMPUTER SYSTEMS, INCAssistant Product Manager at UNISON COMPUTER SYSTEMS, INC
Jeron Dave LambinoJeron Dave Lambino
Technical Business Analyst at Systems And Software Consulting Group Inc.Technical Business Analyst at Systems And Software Consulting Group Inc.
FEROZKHAN AFEROZKHAN A
Senior DevOps Engineer at Financial Software SystemsSenior DevOps Engineer at Financial Software Systems