Oscar Tejada
Laurel,MD
Summary
Professional Summary
Systems Administrator with experience in managing Windows servers, Active Directory, and enterprise printer environments. Currently developing skills in PKI and certificate management, with a growing focus on secure and efficient IT infrastructure.
Overview
4
4
years of professional experience
Work History
Systems Administrator II
BAE Systems Inc.
07.2025 - Current
- Currently serving as a Systems and Printer Administrator while training toward a specialized role in Public Key Infrastructure (PKI) administration.
- Installed important security and functionality patches to maintain optimal protections against intrusion and system reliability.
- Drove continuous improvement of IT governance processes.
- Oversaw file system and storage upgrades while safeguarding data integrity and redundancy.
- Managed onboarding and offboarding of employees.
- Delivered services to customer locations within specific timeframes.
- Configured and setup printers on client sites
- Maintained and patched Windows Server environments, ensuring maintaining uptime and secure configurations.
- Deployed and configured file shares, DHCP, DNS, and other core infrastructure services.
- Administered enterprise-wide print servers and networked printers (e.g., HP, Xerox), improving printer uptime.
- Monitored and resolved print spooler issues and hardware errors to reduce printer downtime by 60%.
- Deployed, troubleshot, and replaced network printers via print server integration using DHCP and Group Policy, ensuring efficient and reliable printer connectivity.
- Implemented secure printing solutions and monitored print queue performance and availability
- Gaining hands-on experience with Microsoft AD CS (Active Directory Certificate Services) and certificate templates.
- Learning to troubleshoot PKI-related authentication and encryption issues in a domain environment.
- Assisting with certificate lifecycle management including issuance, renewal, and revocation of digital certificates.
Tier 2 Helpdesk Technician
Craytek
06.2024 - 06.2025
- Maintained office PCs, mobile devices, and printers
- Reimaged Mobile phones, Tablets and Laptops
- RMA Technician in charge of fixing and troubleshooting broken laptops
- Prepared IT assets for DRMO
- Created and completed tickets through IVANTI Ticketing System
- Windows 10 desktop support in-person and remote control access
- Setup equipment and wireless devices for both SIPRNET and NIPRNET
- Helped streamline repair processes and update procedures to support action consistency.
- Assist in maintenance, troubleshooting, and administration of mobile devices, laptops, and tablets
- Created SOPs for processes and procedures
- Configure hardware, devices, and software to set up workstations for employees.
- Mentored new hires, resulting in stronger staff development and increased productivity.
- Trained and mentored 5 new personnel hired to fulfill various roles.
Tier 1 Helpdesk Technician
Lintech Global
03.2024 - 06.2024
- Meet established service level metrics for call response, technical support, and customer service.
- Input trouble calls into the OIG ticket tracking system. Ensure all relevant information is gathered and documented.
- Resolve trouble calls in person at the help desk, over the phone, and/or through email.
- Analyze and resolve trouble tickets utilizing tools such as remote desktop.
- Escalate trouble tickets when required by service desk processes to Tier II, Tier III, or an appropriate team/individual.
- Provide follow-up service to end-users to ensure that service provided by the Help Desk has
addressed their needs in a timely and efficient manner. - Assign trusted agents (TA’s) responsible for issuing alternate tokens to HQ personnel when required.
- Fully document call resolution and ensure all notes are maintained in the ticket tracking system and Knowledge Base articles are published when applicable.
- Maintain existing SOPs and, when required, create new ones in support of this objective for common Help Desk processes and activities.
Inventory Management Specialist
United States Marine Corps, USMCR
11.2021 - Current
- As an NCO, my tasks typically involve supervising Marines as well as leading and guiding Marines to accomplish certain tasks
- Assisted in processing of new inventory and disposal of outdated items to keep products fresh and up-to-date
- Record information, shortages, and discrepancies to keep records current and accurate
Skills
- Windows Server (2016–2022)
- Active Directory (AD) & Group Policy (GPO)
- DNS, DHCP, File/Print Services
- Print Server Management
- Printer Firmware & Driver Management
- NIPR/SIPR
- Customer service
- Support Ticket System Management
- Microsoft AD CS (Active Directory Certificate Services)
- Certificate Management (in progress)
- Performance testing
- Disaster recovery
Security Clearance
- Interim Top Secret Security Clearance
Certificates
CompTIA Security+ Certified | Expires: July, 2028
CompTIA A+ Certified |Expires: March, 2027
Education
Expected 07/2027
Bachelors of Applied Science Degree in Computer Information Systems - Cybersecurity Focus
California Institute of Applied Technology - National City, CA
Expected 11/2025
Associate of Applied Science Degree in Computer Information Systems
California Institute of Applied Technology - National City, CA
06/2021
High school Diploma
Laurel High school - Laurel, MD
Languages
Spanish
Native or Bilingual
English
Native or Bilingual
Timeline
Systems Administrator II
BAE Systems Inc.
07.2025 - Current
Tier 2 Helpdesk Technician
Craytek
06.2024 - 06.2025
Tier 1 Helpdesk Technician
Lintech Global
03.2024 - 06.2024
Inventory Management Specialist
United States Marine Corps, USMCR
11.2021 - Current
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