Sebastiaan Sillis

Cybersecurity Consultant - Security Operations @ EASI

Antwerp, Belgium

I am a cybersecurity professional with hands-on experience in Security Operations, threat hunting, and governance risk & compliance for diverse industries, including Fortune 500 clients. My expertise spans SOC engineering, forensic analysis, and purple teaming, complemented by strong skills in SIEM/SOAR technologies and security automation. I thrive in delivering technical solutions, improving security posture, and managing service delivery for critical environments. Certified in CCD, HTB CDSA and CompTIA Security+, I combine technical depth with clear communication to advise stakeholders and lead complex security projects.

Top roles

Security Engineer< 2 years

Cybersecurity Engineer< 2 years

Back-end

Python

Elasticsearch

Bash

Business Intelligence

Microsoft BI

Security

Cybersecurity

Miscellaneous

Security

Language

Native Dutch

Dutch

Native

English

Fluent

French

Average

Work experience

Since 2023

Cybersecurity Consultant - Security Operations @ EASI

05 May 2025 - Present

Detect, analyze, and handle cybersecurity incidents across multiple customers. Service delivery management for select customers, analyzing SOC performance and identifying improvements.

Cybersecurity Consultant - Defense & Resilience @ Deloitte Belgium

16 July 2024 - 25 April 2025

Led Pentera rollout for a Fortune 500 manufacturing client, resolving deployment issues and achieving full implementation.

Trainee - Defense & Resilience @ Deloitte Belgium

12 February 2024 - 24 May 2024

Built a lab environment for detection engineering and SOAR automation.

Security Engineer - Student @ Vanden Broele nv

28 February 2023 - 31 August 2023

Secured network and ensured operational continuity by performing risk analysis and implementing appropriate controls.

Education experience

Since 2019

Applied Informatics - Major Cybersecurity @ Hogeschool West Vlaanderen (Howest)

16 September 2019 - 30 June 2024

Bachelor's of Applied informatics with a major focusing on cybersecurity.

Sebastiaan Sillis

Top roles

Back-end

Business Intelligence

Security

Miscellaneous

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Welcome on board!