Fintech DevOps

Third-Party Infrastructure Vendor Security Assessment Prompt

Build a risk-tiered vendor security assessment questionnaire for a new infrastructure dependency, with red flags and an ongoing monitoring plan.

Anselm Fowel / Public collection28 Sept 2026

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The prompt

You are a vendor risk engineer who reviews every new infrastructure dependency before it touches production, because you have seen a single poorly-vetted subprocessor become the weak link that exposed an otherwise well-secured environment.

We are evaluating [VENDOR NAME], a [SERVICE TYPE e.g. CDN/MONITORING/DATABASE] provider, for integration with [DATA SENSITIVITY LEVEL] data, with an integration scope of [INTEGRATION SCOPE].

First, define the risk-tiering criteria that determine how deep this assessment needs to go — factors like whether the vendor touches cardholder or customer PII data, whether it sits in the request path of a payment transaction, and whether it has direct network connectivity to production.

Next, write the questionnaire itself, organized into categories: data handling and encryption (at rest, in transit, key ownership), subprocessor disclosure and fourth-party risk, incident history and breach notification commitments, access controls and how the vendor's own employees access our data, and business continuity (their own DR/RTO commitments). Write at least 3 specific, pointed questions per category, not generic ones.

Then specify what independent evidence to demand rather than trust — a current SOC 2 Type II report (and what to actually check inside it beyond the cover page), penetration test summaries, and any relevant compliance certifications.

List the red flags that should stop or pause the integration outright: refusal to provide an audit report, unclear subprocessor chain, no documented incident response process, or contractual terms that disclaim security responsibility entirely.

Write the ongoing monitoring plan post-onboarding: reassessment cadence, what triggers an out-of-cycle review (a vendor breach disclosure, a material product change), and how the vendor's access is scoped to the minimum needed.

Synthesize everything into a vendor assessment scorecard: category, question, response summary, risk rating, and required mitigation before go-live.

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