MEET OUR TEAM
Behind every pentest is a person, not just a report
Cybersecurity can sound like a world of reports and code. For us it comes down to people who spend their days looking for what could go wrong, so your organization does not have to find out the hard way.

Who are we?
Spend an afternoon in the office and you’ll also hear people discussing a finding they came across that week, not because anyone asked them to, but because it’s genuinely interesting to find out how a colleague gained access to a system, and because it sharpens the next test. Shop talk happens here just as much as small talk, sometimes at the same table, right alongside conversations about who went climbing that weekend or which new coffee roaster someone found.
There is a little over twenty of us, so people know each other beyond a name in an email signature. A junior tester can pull up a chair at the same table where a managing partner is working, and nobody thinks twice about it. That kind of access reflects what we actually care about here: clear communication, genuinely knowing the people you work with, and learning from each other as you go.
We build on that deliberately too, through the team building activities we organize throughout the year and, of course, our annual offsite, which reliably produces at least one story that new colleagues end up hearing more than once during their first months here.
Meet some of our colleagues

Nico Cooman
MANAGING PARTNER
” tSF is a home for pentesters at which they can do only what they love to do, and have colleagues with the same passion to discuss and brainstorm with.

Jorden Deserrano
TECHNICAL LEAD
” I ensure that the quality of our pentests remains high. One of the things I enjoy most is helping others learn new things and seeing them grow.

Sverre Lauwers
” My knowledge has grown not only through challenging projects but also through the open and collaborative atmosphere we have as a team.

Leni Van Tongerloo
” No two days are the same. The goal is always to make sure that the projects fit together like a puzzle and that the clients are satisfied with the result.
Our Business Developers

Sebastiaan Van Dyck
” What I love most about my role? Social interaction. I enjoy connecting with clients, understanding their needs, and guiding them toward the right solutions.

Pim Maes
” What I love most about my role? Social interaction. I enjoy connecting with clients, understanding their needs, and guiding them toward the right solutions.

Gilian Maes
” What I love most about my role? Social interaction. I enjoy connecting with clients, understanding their needs, and guiding them toward the right solutions.
Viktor Blockx
” What I love most about my role? Social interaction. I enjoy connecting with clients, understanding their needs, and guiding them toward the right solutions.