Eleni Machaira

Threat Intelligence | Cybersecurity & Resilience at Mastercard Europe

Greece

About

Experience

  • Senior Specialist, Cybersecurity & Threat Intelligence at Mastercard
    Jun 2025 - Present · 1 yr 2 mos

  • Deloitte (2 yrs)
    • Incident Response Assistant Manager - North South Europe (NSE)
      Jul 2023 - Jun 2025 · 2 yrs

      • Led end-to-end investigation and response for security incidents across the UK and NSE regions, ensuring timely containment, eradication, and recovery. • Managed high-priority and complex incidents, providing leadership during on-call and out-of-hours. • Delivered detailed post-incident reports to senior leadership, outlining impact, root cause, and strategic remediation recommendations. • Conducted proactive threat hunting and supported the integration of threat intelligence into operational processes. • Collaborated with global and regional teams to assess zero-day vulnerabilities and strengthen defenses across critical assets. • Mentored junior team members and contributed to the continuous improvement of incident response procedures. • Supported compliance-led initiatives and internal process automation within Cyber Security Operations.

    • Incident Response Assistant Manager - UK Cyber Security Operations
      Sep 2023 - Feb 2025 · 1 yr 6 mos

  • Cyber Security Analyst at The Workshop - Inventors of Play
    Mar 2022 - Jul 2023 · 1 yr 5 mos

    • Implemented and managed core security controls, including endpoint detection, email protection, and firewall policies. • Led incident management across global teams, driving effective response coordination and timely resolution. • Created and maintained incident response playbooks and documentation aligned with frameworks such as MITRE ATT&CK and NIST. • Designed and facilitated tabletop and desktop exercises based on realistic breach scenarios, including purple teaming activities to enhance readiness and cross-team collaboration.

  • Research Associate at Center for Security Studies (KEMEA)
    Jul 2021 - Dec 2021 · 6 mos

    • Contributed to EU-funded security policy research by conducting qualitative and quantitative analysis focused on threat prevention and public safety. • Translated and interpreted EU directives, facilitating communication between senior leadership and European project partners. • Assisted in interviews with research participants and supported data gathering for cross-border policy studies. • Transcribed and organized interview data to inform policy recommendations and formal reporting.

  • Cyber Security Advisor at CSI Institute
    Jul 2019 - Jun 2020 · 1 yr

    • Organised and delivered cybersecurity seminars tailored to diverse target groups, including professionals, students, and non-technical audiences. • Translated complex cyber threat concepts into accessible language to raise awareness and promote preventative practices. • Supported broader awareness initiatives by contributing to the development of educational materials and operational documentation.