Mario Antoniou

Profile

Dedicated and detail-oriented IT professional with a First-Class Honours degree in Computer Science from Middlesex University. Currently working as a 1st Line IT Engineer at Cleshar, delivering technical support and maintaining enterprise IT systems across diverse platforms. Experienced with Jira ticketing, Active Directory (AD), Microsoft 365 Admin Center, Exchange Server, Entra, Intune, MaaS360, Meta Compliance, and Mimecast. Proven ability to efficiently resolve technical issues while prioritizing user satisfaction and service quality.

Core Skills

• First-Line IT Support
• Cyber Security
• Active Directory & Microsoft 365 Administration
• Exchange Server, Entra, Intune, MaaS360, Mimecast
• Jira Ticketing System Management
• User Account & Permissions Management
• IT Onboarding & Offboarding Processes

Professional Experience

1st Line IT Engineer, Cleshar – London, UK

March 2025 – Present

• Provide first-line technical support across the organization.
• Manage user accounts, permissions, and group policies.
• Administer secure and compliant IT operations, cybersecurity awareness and training.
• Log and manage support requests, ensuring accurate documentation and timely follow-ups.
• Played a key role in the company-wide transition from Windows 10 to Windows 11, including computer builds and deployment, minimizing disruption and improving system performance.

Office Administrator, Cleshar – London, UK

June 2023 – March 2025

• Maintained and updated railway weld databases for TFL and Network Rail.
• Updated and monitored the Fatigue & Risk Index to ensure safety compliance for track operatives.
• Assisted in the planning and coordination of track maintenance teams across various departments, including welding, grinding, and burning.
• Managed inventory systems to support operational efficiency and materials tracking.

Education

BSc Computer Science (First-Class Honours), Middlesex University, London (2020 – 2024)

Relevant skills: Software Engineering, Networking, Object-Oriented Programming, Web Development

Certifications

• DBS Check (2024)
• SLA Certification (2021 – 2023)
• First Aid Certification (2022)
• Military Training (2017)

Languages

• English (Fluent)
• Greek (Fluent)
• Russian (Fluent)
• Spanish (Basic)

Additional Experience

• The Counter Soho, London, UK (Nov 2024 – June 2025)
• Chingon Tacos, London, UK (Sep 2023 – May 2024)
• The Beaufort Pub, London, UK (May 2021 – Nov 2021)
• Starbucks, London, UK (Sep 2019 – Jul 2020)
• Trippers Bar, Limassol, Cyprus (May 2018 – Aug 2019)
• Cypriot National Guard, Nicosia, Cyprus (July 2016 – May 2018)

Projects

• Optical Character Recognition Desktop Application
  Developed an OCR form reader using Python and Google Cloud Document AI. Achieved 85% grade, demonstrating skills in cloud APIs and image processing.
• Web-Based Mobile App
  Created a Vue.js app for scheduling after-school classes. Achieved 90% grade, showcasing front-end development.
• Data Visualization Website
  Built a TypeScript app with AWS Lambda and Java backend for forex data visualization. Achieved 86% grade, illustrating cloud and data analytics skills.