A team of veterans who defend what matters.
Founded in 2014 by offensive and defensive security veterans from Mandiant, the Big Four, and a national CERT. We protect 500+ organizations across 28 countries — with senior-only teams and a follow-the-sun SOC.
From red-team engagements to global SOC.
SENTINEL started in 2014 as a small offensive security boutique in Dublin. We won our first red-team engagement by chaining four zero-days into a domain takeover in 36 hours — and we haven't slowed down since.
Today, we run three SOCs (Dublin, Austin, Singapore) and a 120-strong team of senior engineers, threat intel analysts, and incident responders. We work with regulated banks, fast-scaling SaaS, healthcare networks, and critical infrastructure operators. Every engagement is senior-led. No bait-and-switch staffing.
How we work.
Senior-only teams
The people you meet in sales are the people doing the work. No juniors in disguise, no bait-and-switch staffing.
Outcomes over outputs
We don't bill for dashboards or "alerts triaged." We bill for risk reduced and incidents contained — measured and reported.
Vendor-agnostic
No reseller rebates, no product quotas. We recommend what you need, integrate with what you have, and tell you when something isn't worth it.
Assume breach
Defense-in-depth, zero-trust defaults, and detection engineering that actually works. We design for the day you get compromised — not for the day you don't.
Teach as we go
Every engagement leaves your team stronger. We share playbooks, run purple-team exercises, and run monthly threat-intel briefings for your analysts.
Global, by design
Three SOCs, follow-the-sun handoffs, data residency in EU, US, and APAC. Your environment is never unwatched.