Cybersecurity Consultancy
How we help you
Security strategy & governance
What will your security policy look like in three years? Who decides what? How does security become part of decision-making instead of a department that always joins too late?
Compliance guidance
NIS2, DORA, ISO 27001, CRA — regulations are complex and evolving. We help you not just tick the box, but achieve demonstrable resilience that convinces regulators and auditors.
Security architecture review
We assess your IT and OT architecture from a risk perspective. Where is there overbuilding? Where are the blind spots? Which choices deserve reconsideration?
OT/IT convergence
When your operational technology and IT environment are connected, it introduces risks that traditional IT security does not cover. We understand both worlds.
Post-incident improvement
After an incident, you know something went wrong. We help you determine what needs to change structurally — not just the immediate cause, but the underlying vulnerabilities.
The DEFION distinction
Not just advisors — also executors
Our consultants are the same people who perform pentests, respond to incidents, and conduct SOC analyses. They know the gap between advice and reality — and bridge it.
IT and OT — no blind spots
DEFION has proven expertise in both IT and OT environments. In sectors where both converge — manufacturing, energy, water, transport — this is essential.
Vendor-neutral, always
We do not sell products, licenses, or tooling. Our advice is based on your interest. If an existing supplier performs well, we say so. If they fall short, we say that too.
Born from twenty years of fieldwork
DEFION originated from Computest Security and Incide. Our consultants have seen their advice work — and fail. That makes their approach realistic.
For which organizations is Cybersecurity Consultancy relevant?
Cybersecurity consultancy is the right tool for:
- Organizations without a full-time CISO who need strategic guidance but do not justify headcount for a permanent security role
- Boards and executives personally liable under NIS2 who need demonstrable insight into their organization's security posture
- Manufacturing and critical infrastructure where IT and OT converge and traditional IT security advisors miss the OT context
- Financial institutions seeking to gain control over DORA requirements for ICT risk management and resilience
- Organizations after an incident or near-incident that want to improve structurally, not just remove the immediate cause
- Medium-sized organizations (200-2,000 employees) that are too large to ignore security but too small for a full internal security team
- During mergers, acquisitions, or outsourcing where the security posture of another party must be independently assessed before decision-making
- Organizations in regulated sectors: energy, water, transport, healthcare, financial
"Thanks to DEFION, we benefit from up-to-date knowledge about contemporary security threats and ways to prevent risks. We have peace of mind knowing that we are fully supported 24/7 by their team." AFAS Software
"Thanks to DEFION, we benefit from up-to-date knowledge about contemporary security threats and means to avert risks. We have peace of mind knowing we are fully supported 24/7 by their team.”
Jeroen van Stokkum Manager ICT
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“The sector and the partners we work with maintain increasingly high security standards for IoT-products and services. Protecting the privacy of individuals in the images and the sensitivity of the information the drones collect, such as on objects in critical infrastructure, requires our security to be airtight. With Defion, we are working with a professional partner who can support us at the right level. The collaboration also fits perfectly within our strategy to deliver reliable and secure drone technology to European customers.”
Benjamin van der Hilst Co-Founder & CEO
“New requirements from NIS2 for OT systems are increasing the focus on security. With Defion, we know we have the right expertise in-house to keep our systems secure. The collaboration was easy and pleasant; the specialists truly sat next to us rather than across from us. Thanks to their openness and expertise, we are working together toward the same goal: optimal security. This gives us the confidence to face the future.”
Alexander OdijkTeam Manager
“If you look at where we were ten years ago, we’ve made enormous progress. The sense of control is greater. With Security Assurance and MDR we have set up processes and control mechanisms that allow us to limit the impact of a potential attack. The collaboration also serves as a constant reminder to maintain focus on security and set the right priorities in that area. It keeps us alert and sharp. Moreover, Defion’s specialists are highly technical and passionate about their field. That clearly shows in their services.”
Gerco VermeerDevelopment Manager
