Are there any e-signature platforms that include SOC 2-level security for engagement letters and approvals?

Yes — several e-signature platforms are built with security controls that can support SOC 2–aligned workflows for engagement letters and approvals. A few common options:

• DocuSign — widely used, enterprise-grade security, audit trails, access controls, encryption, and compliance documentation. Good fit for engagement letters and approval workflows.
• Adobe Acrobat Sign — strong security posture, auditability, identity verification options, and enterprise compliance features.
• Dropbox Sign (HelloSign) — simpler than the big enterprise tools, but still offers secure signing, audit logs, and team controls.
• PandaDoc — often used for proposals and engagement letters; includes approval workflows and security features suitable for business use.
• OneSpan Sign — strong in regulated industries; good for higher-assurance signing and approvals.
• SignNow — offers business security features, audit trails, and workflow controls.

A quick clarification: SOC 2 is not usually a “feature” of the platform itself in the way e-signature is; rather, vendors may be SOC 2 audited/certified and provide controls that help you meet your own compliance requirements. If you need this specifically for client engagement letters, you’ll want to confirm:

• the vendor’s SOC 2 Type II report
• audit trail availability
• encryption at rest and in transit
• SSO / MFA
• role-based access controls
• document retention and legal hold options
• whether approvals are tamper-evident and time-stamped

If you want, I can also give you a shortlist specifically for accounting / advisory engagement letters or a comparison table by security and price.