IT Technician with hands-on experience in technical support, troubleshooting, IT infrastructure, networking, and enterprise environments. CompTIA and Microsoft certified, with a strong focus on delivering reliable IT support and continuously developing practical technical skills through real-world work and hands-on lab projects.

I currently work as an IT Technician at Transtema, supporting IT and network infrastructure in data center and enterprise environments.

My day-to-day work includes technical support, incident handling, installation, configuration, troubleshooting, and verification of IT and network equipment. I work with servers, switches, network connections, fiber/DAC, SFP/QSFP transceivers, and other infrastructure components while documenting findings and collaborating with other technical teams when escalation is required.

I also have experience with end-user support, Microsoft 365, account administration, Windows environments, and ticket-based support.

Outside of work, I build hands-on IT labs to strengthen my skills in IT support, Windows Server, Active Directory, Microsoft 365, identity management, networking, and enterprise troubleshooting.

My goal is to continue developing as an IT Technician and IT Support Specialist, while gradually expanding my expertise in system administration, Microsoft 365, identity and access management, endpoint management, and enterprise infrastructure.

• End-user and technical support
• Onsite and remote support
• Hardware and software troubleshooting
• Incident handling and escalation
• Structured troubleshooting and root cause analysis
• Ticket documentation and technical handover
• ServiceNow
• Jira

• Windows 11
• Windows Server
• Microsoft 365
• Active Directory
• Microsoft Entra ID
• User and group administration
• Account and access management
• Group Policy fundamentals
• Microsoft Intune fundamentals
• Endpoint and device administration

• TCP/IP
• DNS
• DHCP
• VLAN fundamentals
• Network connectivity troubleshooting
• Switch port troubleshooting
• Fiber and DAC connections
• SFP / QSFP transceivers
• Basic routing and firewall troubleshooting
• pfSense

• Server installation and troubleshooting
• IT hardware installation and configuration
• Data center and enterprise IT environments
• Windows and Linux troubleshooting
• Linux fundamentals
• SSH and remote administration
• Virtualized lab environments

In my current IT Technician role, I work with:

• Installing, configuring, and maintaining IT and network equipment in data center and enterprise environments
• Handling technical support, incidents, and infrastructure-related issues
• Troubleshooting hardware, networks, and connectivity problems
• Troubleshooting fiber/DAC, SFP/QSFP, switch ports, servers, and network equipment
• Troubleshooting DNS, DHCP, TCP/IP, VLAN, and connectivity-related issues
• Verifying physical and network-layer connectivity
• Documenting troubleshooting steps, findings, and completed actions
• Escalating complex incidents with clear technical documentation
• Collaborating with technical teams across different areas of responsibility

Enterprise-style Windows Server environment built with Windows Server 2025 and Windows 11 to simulate common IT administration and support tasks.

Implemented:

• Active Directory Domain Services
• Domain Controller deployment
• DNS configuration
• Organizational Unit structure
• User and group administration
• Security groups
• Role-based access control
• Password resets and account lifecycle management
• Domain-joined Windows 11 workstation
• Shared folder permissions
• Group Policy configuration

Project:
https://github.com/kelvinmarcar/active-directory-home-lab

Hands-on Microsoft 365 environment focused on identity, access, security, endpoint management, and collaboration services.

Implemented:

• Microsoft Entra ID user and group management
• Multi-Factor Authentication
• Conditional Access policies
• Microsoft Intune device enrollment
• Device compliance configuration
• Windows 11 device management
• Exchange Online shared mailboxes
• Microsoft Teams administration
• Microsoft Defender monitoring
• Entra ID sign-in log investigation

Project:
https://github.com/kelvinmarcar/microsoft-365-enterprise-admin-lab

Hands-on enterprise IT support lab demonstrating structured troubleshooting across Windows and Linux environments.

Implemented:

• Windows performance troubleshooting
• Event Viewer diagnostics
• DNS troubleshooting
• IPv4 and IPv6 troubleshooting
• DHCP service verification
• Linux system troubleshooting
• Remote support using SSH
• Network connectivity diagnostics
• Infrastructure verification
• Root cause analysis

Tools include:

ping ipconfig nslookup dig Event Viewer Task Manager SSH

Project:
https://github.com/kelvinmarcar/enterprise-it-troubleshooting-lab

Hands-on networking lab demonstrating structured troubleshooting across Windows, Linux, DNS, routing, and firewall infrastructure.

Implemented:

• DNS failure investigation
• Hostname resolution troubleshooting
• TCP/IP connectivity diagnostics
• Routing analysis
• pfSense firewall verification
• Linux network troubleshooting
• DNS forwarder configuration
• Root cause analysis
• Infrastructure validation
• End-to-end connectivity verification

Project:
https://github.com/kelvinmarcar/enterprise-network-troubleshooting-lab

• CompTIA Security+
• CompTIA Network+
• CompTIA A+
• ISC2 Certified in Cybersecurity (CC)
• Microsoft Azure Fundamentals (AZ-900)
• Microsoft 365 Fundamentals (MS-900)
• Google IT Support Professional Certificate

I am currently focused on strengthening my expertise in:

• IT Support
• Onsite Support
• Enterprise IT Support
• Windows and Microsoft 365 environments
• Active Directory and Microsoft Entra ID
• Identity and access management
• Endpoint and device management
• Networking and connectivity troubleshooting
• Windows Server administration
• Enterprise infrastructure troubleshooting

• IT Technician
• IT Support Specialist
• IT Support Engineer
• Onsite Support Technician
• Desktop Support Technician
• Service Desk Technician
• Technical Support Specialist
• Junior System Administrator

I approach IT support with a simple principle:

Understand the issue → troubleshoot systematically → verify the solution → document clearly → escalate when necessary.

I value reliability, clear communication, structured troubleshooting, continuous learning, and providing users with professional technical support.