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Information Security Engineer Senior (m/f/d)

Contract
Brussels, Belgium
24.06.2026

A large, international organisation operating in a highly regulated environment, providing critical digital and infrastructure services to a wide range of stakeholders. The company is strengthening its cyber security capabilities and is looking to enhance its threat detection and monitoring practices within endpoint environments.


Responsibilities:

  • Design, build, and maintain detection use cases across endpoint environments, with a focus on Unix-based operating systems
  • Analyse security logs and telemetry data to identify suspicious activity and translate findings into actionable detection rules
  • Continuously improve detection quality by tuning rules, reducing false positives, and enhancing overall visibility
  • Collaborate closely with security operations teams to align detection capabilities with real-world threats and incidents
  • Contribute to expanding logging, monitoring coverage, and overall detection maturity
  • Apply structured threat frameworks to develop consistent and effective detection strategies

Qualifications and Skills:

  • Strong analytical mindset with the ability to interpret complex security data and identify meaningful patterns
  • Solid understanding of endpoint systems (particularly Unix/Linux-based environments) or experience in cyber security / threat detection
  • Ability to communicate technical findings clearly to both technical and non-technical stakeholders
  • Team-oriented attitude with experience working in collaborative, operational environments
  • Knowledge of scripting or pattern-matching techniques (e.g. shell scripting, regular expressions) is an advantage
  • Structured and detail-oriented approach with a continuous improvement mindset

Halian Group:

With over 28 years of experience, we have come to understand that innovation is the only way to provide agile, practical solutions that transform businesses and careers.

Our resourcing and smart services help you to realise tomorrow’s potential. Discover the amazing things possible when you bring the right people and the right technologies together.

At Halian, we recognise that diversity, equity, and inclusion (DEI) are essential to building high-performing teams for our clients. We are committed to connecting organisations with top talent from all backgrounds, ensuring that every individual feels valued, respected, and empowered to contribute their unique perspectives. We encourage applications from all qualified candidates, regardless of race, gender, disability, or any other characteristic that makes them unique. By fostering diverse and inclusive workplaces, we help our clients drive innovation, enhance collaboration, and better reflect the communities they serve.

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