José Gabriel Costa Santos

I’m a Tier 3 Windows Server Engineer specialized in Active Directory / Directory Services, focused on critical escalations, RCA, and improving stability/security in enterprise Microsoft environments.

What I solve (end-to-end ownership):

AD DS: replication, FSMO roles, trusts, LDAP, RODCs

GPO / Group Policy processing and policy-related issues

DNS troubleshooting impacting domain services

SYSVOL / DFSR / FRS health, consistency and replication issues

Windows Time Service (W32Time) and authentication dependencies

Authentication & security: Kerberos, NTLM, PKI/certificates

How I work: log/trace analysis, structured troubleshooting, clear action plans, stakeholder updates, documentation & knowledge transfer.