Freelancer profile translated to English.
Back to original languageAbout Sebastian
Ensuring data reliability, resilience, and security in a Microsoft / Linux / Cloud (Azure) hybrid environment.
Proactive and rigorous, with strategic vision and technical expertise to design, implement, and maintain compliant, high-performing, and secure IT environments.
Key Skills
- Security & Compliance
ISO 27001 Lead Implementer – Certification project management and continuous improvement
GDPR compliance and security awareness
Tools: Fortinet (FortiGate), Sophos EDR, Netwrix, Azure Security Center, Defender 365
- Infrastructure & Networks
Windows Server Administration, Active Directory, GPO, LAPS, AppLocker
VLAN creation and management, network filtering and security policies
Monitoring and hardening of Fortigate / Sophos firewalls
Hybrid multi-OS management: Windows, Linux, macOS
- Cloud & Microsoft 365
Identity management with Microsoft Entra ID (Azure AD)
Microsoft 365 administration and security: Teams, Outlook, SharePoint, OneDrive, DLP, Copilot
Azure integration and IT process automation
Deployment and monitoring of enterprise applications with MFA authentication
- Monitoring & Analysis
Log collection and correlation via Netwrix and SIEM tools
Implementation of monitoring plans and proactive anomaly detection
Continuous improvement of security policies based on log analysis
- Key Achievements
Full ISO 27001 compliance: ISMS definition, document management, internal audit, and certification maintenance.
Strengthening network security through complete redesign of Fortigate rules and VLAN segmentation.
Implementation of advanced GPO policies (AppLocker, browser hardening, MFA).
Implementation of a GDPR strategy and internal information security training.
Deployment of a Netwrix solution for real-time IT system monitoring and privileged access management.
Spanish
Native or bilingual
French
Native or bilingual
English
Fluent
Can work on-site
Genève (up to 50km)
Experience
- TELEACTIS,CDI TECH MANAGERTELECOMMUNICATIONSJune 2025 - Today (1 year and 2 months)Geneva, SwitzerlandOptimization of system and data security by integrating AI solutions and APIs, reducing risks and ensuring client confidentiality. Design and maintenance of robust architectures, audits, and penetration tests that have strengthened infrastructure resilience and availability. Alignment of cybersecurity initiatives with business strategy and GDPR / ISO 27001 compliance, improving customer and partner trust.
- FORCE PLUS,CDI SECURITY DATA MANAGERTELECOMMUNICATIONSOctober 2020 - June 2025 (4 years and 8 months)Lyon, FranceStrengthening the security and reliability of the IT system, ensuring client data confidentiality and GDPR compliance, while reducing operational risks. Optimization and evolution of systems and network infrastructures (Windows Server, Linux, VLAN, Fortigate/Sophos), improving IT service performance, availability, and resilience. Implementation of proactive monitoring and log analysis (Netwrix, EDR) and secure access management (Microsoft Entra / M365 / Azure), enabling rapid incident detection and lasting protection of digital assets.
- Worldline Global,STAGE R&D E-PAYMENTSE-COMMERCEMarch 2020 - August 2020 (5 months)41000 Blois, FranceLeading R&D projects in e-payments, open banking, and PSD2/XS2A, ensuring innovation, GDPR compliance, and financial transaction security while optimizing customer experience.
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Education
- Cybersecurity ExpertM2i Formation2022Expert en cybersécurité
- Security and Information TechnologyInstitut National des SciencesAppliquées2020Sécurité et Technologies Informatiques