Auditor

In the SOC 2 context, the auditor is the independent CPA who examines a service organization's controls and issues the formal opinion in the attestation report. Auditors must be licensed CPAs because SOC 2 is an AICPA attestation standard, not a security certification, and only CPAs can issue opinions under the standard. The auditor is typically a partner or manager at a CPA firm, supported by a team of staff auditors who execute the testing. Selecting the right auditor matters: experience with companies your size and in your industry significantly affects the audit's smoothness and cost. Big Four firms tend to be expensive and process-heavy; specialist SOC 2 firms often deliver better value for startups and mid-market companies. The auditor relationship is multi-year: the same firm typically performs annual audits, building familiarity with the control environment over time. Switching auditors mid-program is possible but adds friction because the new firm must familiarize themselves with the system from scratch.