Senior Systems Administrator 4P/655

 Location: Atlanta, GA
 Contract- 6 Months
Client- Southern Company.

Position Summary

We are seeking a highly skilled Senior Systems Administrator – Messaging to lead the administration, optimization, and automation of enterprise messaging platforms.

This role supports and enhances Microsoft Exchange (on-prem, hybrid, and Exchange Online), Microsoft 365, and Proofpoint environments. A strong emphasis is placed on automation-first engineering, leveraging PowerShell, Python, Microsoft Graph API, REST APIs, and Power Automate to reduce manual operations and enable scalable, resilient systems.

The ideal candidate brings a code-first mindset, strong scripting ability, and deep enterprise messaging expertise.

Key Responsibilities

Messaging Platform Administration & Support

• Administer and support:
  • Microsoft Exchange Server (on-prem & hybrid)
  • Exchange Online (Microsoft 365)
• Ensure high availability, performance, reliability, and security.
• Troubleshoot complex issues and conduct root cause analysis.
• Lead modernization and system improvement initiatives.

Proofpoint Administration

• Administer Proofpoint email security suite:
  • TRAP
  • TAP
  • EFD
  • SER
  • POD
• Tune policies to reduce false positives and improve detection.
• Coordinate incident response with security teams.

Automation & Engineering (Core Focus)

• Build automation solutions for daily messaging tasks.
• Develop reusable PowerShell and Python modules with:
  • Error handling
  • Logging
  • Source control (Git)
• Automate user lifecycle and mailbox management via Microsoft Graph API.
• Consume and integrate REST APIs (authentication, pagination, JSON parsing).
• Build Power Automate workflows for cross-system orchestration.
• Continuously identify and eliminate manual processes.

Monitoring & Alerting

• Configure enterprise monitoring and alerting.
• Integrate messaging platforms with monitoring/SIEM tools.
• Implement automated remediation triggered by alerts.

Project Delivery & Continuous Improvement

• Execute messaging-related projects including:
  • Platform migrations
  • Mail flow changes
  • Security enhancements
• Partner with infrastructure, identity, and security teams.
• Maintain technical documentation and code repositories.
• Standardize processes and improve automation at scale.

Required Qualifications

• Strong automation-first mindset.
• Advanced PowerShell and Python scripting skills.
• Experience working with:
  • Microsoft Graph API
  • REST APIs
  • Power Automate (or similar orchestration tools)
• Hands-on administration experience with:
  • Exchange Server (on-prem & hybrid)
  • Exchange Online
• Experience with Proofpoint security suite.
• Experience configuring enterprise monitoring and alerting.
• Strong troubleshooting and analytical skills.
• Ability to work independently under general direction.
• Willingness to participate in on-call rotation.

Technical Skills Summary

• Microsoft Exchange (On-Prem & Online)
• Microsoft 365
• Proofpoint (TRAP, TAP, EFD, SER, POD)
• PowerShell (Advanced)
• Python
• Microsoft Graph API
• REST APIs
• Power Automate
• Git / Source Control
• SIEM / Monitoring Integration

Core Competencies

• Code-first engineering mindset
• Process automation expertise
• Enterprise troubleshooting skills
• Strong documentation discipline
• Cross-team collaboration
• Clear technical communication