When to Hire a Fractional CISO (and When You Shouldn't)

The fractional-CISO market exists because mid-market firms hit the same wall: they have enough security exposure that a part-time external advisor isn’t enough, but not enough budget for a full-time hire who’d otherwise cost $300k–500k all-in. So they look at fractional.

It’s the right call about 60% of the time. The other 40%, it’s a mismatched fix that ends up costing more than the alternative. Here’s the frame.

Hire fractional when these are true

1. You have an audit on the calendar within 12 months. SOC 2 Type II, ISO 27001, CMMC 2.0, or a customer-mandated audit. Fractional CISOs are excellent at audit prep — they know what auditors look for, they’ve written the same evidence package fifteen times, and they can run a tabletop exercise that exposes the gaps before the auditor does.

2. Your engineering team writes good code but doesn’t have a security specialist. This is the most common case. The team is technically strong, threat-modeling is “something we should do more of,” and there’s nobody whose job is specifically to ask the security question first. A fractional CISO sitting in design reviews twice a month catches 99% of what a full-time hire would catch, at a fraction of the cost.

3. You need someone in the room when the board asks. The CFO doesn’t want to be the one fielding security questions quarterly. A fractional CISO on a monthly retainer who shows up to board reviews is enormously cheaper than the alternative.

4. You’ve had an incident, or you’ve had a near-miss. Post-incident, you need senior security judgment for 6–12 months while you build the muscle internally. Fractional gives you exactly that — and the engagement naturally tapers as your team grows.

The signal that fractional is working: 18 months in, you’ve hired a security engineer of your own, and the CISO is increasingly serving as that person’s mentor instead of running the function.

Don’t hire fractional when these are true

1. Your security work is genuinely full-time. If you’re processing payments at scale, running a healthcare data clearinghouse, or building infrastructure for the federal market, you need someone whose only job is your security posture. Fractional gets you 20–30% of a person’s attention. If you need 100%, hire 100%.

2. You can’t act on the recommendations. Fractional CISOs produce recommendations. If your engineering team doesn’t have the bandwidth to implement them, the engagement turns into a backlog of unaddressed findings — which is worse than not having had the engagement in the first place because now an auditor can find it.

3. You’re hoping it’ll be cheaper than building the function. Fractional is right-priced for a specific shape of need. It is not a discount on a full security function. If you’re thinking “this is the cheap version of having a CISO,” the engagement will disappoint both sides.

The shape of a good engagement

The retainers we run look like this:

• Quarterly board-ready posture review (usually in the week before the board meeting)
• Vendor + acquisition diligence on demand
• Audit prep coordination — typically 6–8 weeks before the audit
• Incident-response coordination on call (we don’t promise 4-hour response; we promise clear leadership when it matters)
• Direct access to our engineering and remediation team for the things the CISO can’t fix alone

A typical client: 3–8 hours/week of CISO time, peaks at 15–20 during audit prep. Monthly cadence; quarterly reviews; no surprise bills.

What we’d do

If you’re not sure whether fractional is right for you, the discovery call answers it in 30 minutes. We’ve turned down engagements where the answer was “you actually need full-time” — that’s the cleanest signal that fractional isn’t always the answer.

The Atlas Retainer is what this looks like at Kyni. See Atlas → · Book a discovery call →