Zimbra Administrator for Zimbra 9 → Zimbra 10 Migration Support

We are looking for an experienced Zimbra Administrator to support an ongoing migration from Zimbra 9 (NE) to Zimbra 10 (Daffodil).

This is not a full implementation from scratch — the environment already exists. We need expert-level troubleshooting, validation, and guidance during migration steps.

Current setup:
Source: Zimbra 9 Network Edition (Ubuntu 18)
Target: Zimbra 10.1.x Daffodil (Oracle Linux 9)
Migration method: Rolling / staged migration
LDAP preserved (LDAP/MMR involved)
NG modules, LDS licensing (v3 license)

Tasks may include:
Review migration approach (9 → 10 Daffodil)
LDAP / domain / hostname validation
Zimbra proxy & services troubleshooting
License (LDS) validation and migration checks
Mail flow (Postfix, DNS, DKIM/SPF/DMARC)
Answering specific technical questions during migration

Required experience:
Strong hands-on experience with Zimbra 8.8 / 9 / 10
LDAP / MMR knowledge
Understanding of NG modules and LDS (Zimbra 10 licensing)
Linux (Ubuntu / RHEL / Oracle Linux)
Postfix & mail routing

Nice to have:
Proven experience with Zimbra migrations
Experience with Zimbra Daffodil (10.1.x)
Consulting / troubleshooting background

Engagement:
Short-term / hourly
Initially 3–5 hours (may extend)
Start ASAP

Please briefly describe:
Your Zimbra experience
Proven experience with Zimbra migrations
Versions you worked with (8.x / 9 / 10)
Your Linux experience
Your overall understanding of how email servers work.