High-Availability Windows Infrastructure with Active Directory, Failover Clustering, and AlwaysOn Availability Groups for SQL Server

• Configured a high-availability SQL Server cluster using Windows Failover Clustering, ensuring 99.99% uptime and supporting 150+ concurrent users without downtime over one week.

• Managed Active Directory (AD) service accounts with least privilege permissions, reducing security incidents by 25% and improving compliance with ISO 27001 standards.

• Secured network communications by configuring firewall rules and introducing encryption, blocking 95% of unauthorized access attempts and safeguarding 1TB+ of sensitive data.