How to Evaluate Vendor Security Without a Security Team
When you adopt a vendor, you inherit their security. Most buyers assessing that inheritance have no security team, and they still have to get it roughly right.
Every vendor you adopt becomes part of your attack surface. Their security failures can become your incident, and their data practices become part of your compliance posture. Yet most organizations doing this evaluation have no dedicated security function: just a founder or an operations lead trying to make a sensible call. The good news is that a structured, non-expert evaluation catches most of what matters.
You will not perform a penetration test or audit a vendor code. What you can do is ask the right questions, read the answers critically, and weigh the risk against the sensitivity of the data involved. That is most of the value of a vendor security review, and it is well within reach.
Scale the scrutiny to the data
Not every vendor deserves the same depth of review. Match your effort to what the vendor will hold. A tool that stores nothing sensitive warrants a light touch. A platform that will hold customer personal data, financial records, or anything regulated deserves serious scrutiny, because a failure there is a real business event. Deciding this first keeps you from either over-engineering trivial decisions or under-examining consequential ones.
Ask plainly what data the vendor will store, process, and be able to access. The answer sets the appropriate depth for everything that follows.
The questions that reveal maturity
- Do you have independent security attestations like a SOC 2 report, and can we review the scope and period?
- How is data encrypted, in transit and at rest, and who on your side can access customer data?
- What access controls, SSO, and audit logging do you support for our administration?
- How do you handle vulnerabilities and incidents, and how and when would you notify us of a breach?
- Where is data stored, can we export it, and can we have it deleted when we leave?
- Do you offer a Data Processing Agreement, and who are your sub-processors?
Reading the answers critically
The content of the answers matters, but so does their character. A security-mature vendor answers specifically, has documentation ready, and does not treat reasonable questions as unusual. Vague answers, defensiveness, or an inability to produce basic documentation are themselves signals: not proof of a problem, but a reason to look harder.
Be wary of two traps. First, a certificate is evidence, not a guarantee; read the scope rather than accepting the badge. Second, general assurances (we take security seriously) mean nothing without specifics behind them. Push politely for the concrete: what, exactly, where, exactly, and how you would know if something went wrong.
Turning it into a decision
A vendor security review is a risk judgment, not a pass-fail exam. Weigh the sensitivity of the data, the quality and specificity of the answers, the independent evidence available, and the vendor overall posture, then decide whether the residual risk is acceptable for what you are entrusting them with. Document the decision briefly so you can revisit it as your usage grows or the data becomes more sensitive.
This same framework applies to every vendor, including platforms like Atlas: ask what data is held, request the security specifics and any attestations, confirm data handling and exit terms, and judge the substance rather than the marketing. A buyer who does this consistently makes better and safer choices than one who relies on brand impressions or a single acronym.