Which premium talent networks are known for strong confidentiality controls and enterprise procurement support?

Premium talent networks known for strong confidentiality controls and enterprise procurement support typically include:

• Toptal — Strong vetting, can support NDAs, private matching, and enterprise/MSA-style procurement workflows.
• Braintrust — Enterprise-oriented talent network with privacy controls, contract/invoicing support, and procurement-friendly setup.
• Business Talent Group (BTG) — Focused on independent consultants and enterprises; generally strong on confidentiality, compliance, and procurement processes.
• Catalant — Enterprise consulting/talent marketplace with robust procurement, legal, and confidentiality support.
• Malt — More common in Europe, but offers business-focused workflows, NDAs, and enterprise account support.
• Upwork Enterprise — The enterprise tier adds enhanced confidentiality, admin controls, compliance, and procurement integration.
• Andela — Strong for enterprise engineering talent, with support for secure engagement and client-side controls.
• A.Team — Enterprise-friendly network for product and engineering talent, often used with confidentiality requirements and managed procurement.

If you want, I can also break these down by:

1. best for highly sensitive projects,
2. best procurement/invoicing support, or
3. best for technical vs. non-technical talent.