Senior Systems Administration
Atlanta, Georgia
This position requires office presence of a minimum of 5 days per week and is only located in the location(s) posted. No relocation is offered.
Join AT&T and help shape the future of communications and technology that connect the world. We value innovators who seek to explore the unknown and challenge the status quo. Bring your bold ideas and fearless spirit to redefine connectivity and transform how people share stories and experiences. At AT&T, you won’t just imagine the future—you’ll build it.
What you’ll do:
• Monitoring, Troubleshooting, and Service Availability: Ensure continual service availability through monitoring, troubleshooting, and analyzing problems to prevent service disruptions and to identify root causes along with mitigations to prevent future occurrences.
• Security management, compliance, and data integrity: Perform security compliance, auditing, and remediation, perform set up, maintenance, and monitoring of backups, along with routine hardware and software audits to ensure configuration and standards compliance.
• DevOps and Standards: Develop, promote, and curate standard operating/method of procedures in conjunction with risk assessments to reduce hazards to the network and new solutions being developed, while also maintaining and continuously improving tools, ad-hoc scripting, and automation infrastructure for configuration management, maintenance, testing, auditing, problem remediation and capacity planning.
• Vendor Management: Collaborate with and manage vendors to drive defect resolution and enhancements for internal customers to meet departmental or enterprise business needs, in addition to providing extended support as required.
• Software Installation, Upgrades, and Readiness Testing: Perform and schedule software installations and upgrades to operating systems and layered software packages and may also perform Operational Readiness Testing and Operational Acceptance Testing.
What you’ll need:
Ensure continual service availability by proactively monitoring, analyzing, and resolving issues in production on-premises cloud infrastructure which will require working with teams such as architecture, labs, other operations support teams, and cloud tenants to maintain maximum stability, performance, and security of the current and future cloud environments via the DevOps model while utilizing subject matter expertise in at least some of the following: Linux, cloud computing, Kubernetes, Open.
What you’ll bring:
The Senior System Administrator is responsible for the design, implementation, operation, and optimization of enterprise email transport systems. This role provides advanced technical support for Linux-based messaging environments, including Sendmail/Postfix MTAs and associated SMTP infrastructure, ensuring reliable, secure, and scalable email delivery across the organization.
The position requires deep expertise in Linux system administration, email protocols, and enterprise messaging architecture, with a strong focus on operational excellence, security, and automation.
Email Infrastructure & Operations
Administer and support enterprise email transport systems, including Sendmail and/or Postfix mail transfer agents (MTAs)
Monitor and manage inbound and outbound email traffic across corporate relay systems
Maintain and troubleshoot SMTP mail queues, including resolving latency, backlogs, and mail storms
Manage enterprise SMTP routing, relay configurations, and mail flow policies
Support SMTP, ESMTP, and related protocols, including secure mail transport via TLS
Maintain DNS configurations relevant to email delivery (MX records, routing dependencies)
System Administration (Linux/Unix)
Install, configure, and maintain Linux-based servers supporting email infrastructure
Perform system provisioning, patching, upgrades, and decommissioning activities
Ensure high availability and performance of production systems
Troubleshoot OS-level and service-level issues impacting messaging platforms
Security & Compliance
Implement and manage anti-spam, anti-virus, and content filtering controls
Ensure secure email transport through TLS encryption and certificate management
Enforce enterprise email policies and content control utilizing ProofPoint Services
Collaborate with security teams to mitigate vulnerabilities and ensure compliance
Automation & Scripting
Develop and maintain automation scripts using Bash, Perl, or similar tools
Automate operational tasks such as monitoring, log analysis, and maintenance workflows
Improve operational efficiency through process optimization and tooling improvements
Technical Skills
Advanced experience with Linux/Unix system administration
Strong expertise in Sendmail and/or Postfix configuration and management
In-depth understanding of SMTP and related email protocols (TLS, DNS, IMAP/POP3 fundamentals)
Knowledge of networking fundamentals: TCP/IP, DNS, SSL/TLS, SSH
Experience with email security controls (anti-spam, anti-virus, content filtering)
Proficiency in shell scripting (Bash) and/or Perl
Professional Skills
Strong troubleshooting and analytical problem-solving skills
Ability to manage multiple concurrent tasks in a fast-paced environment
High attention to detail and commitment to operational excellence
Strong communication and collaboration skills across technical teams
Preferred Qualifications
Experience with large-scale enterprise messaging environments
Familiarity with cloud-based email relay or hybrid architectures (e.g., AWS-based SMTP patterns)
Knowledge of directory services (LDAP/Active Directory integration)
Experience with Microsoft Exchange or hybrid messaging environments
Relevant certifications (e.g., Linux, networking, or messaging platforms)
TCP Career Step Differentiator: Performs complex systems administration duties and troubleshooting.
Education/Experience: Bachelor’s degree (BS/BA) desired in Computer Science. 3+ years of related experience. Certification is required in some areas.
Supervisor:
No
Our Senior Systems Administration, earns between $118,800-$178,200 USD Annual, Not to mention all the other amazing rewards that working at AT&T offers. Individual starting salary within this range may depend on geography, experience, expertise, and education/training.
Joining our team comes with amazing perks and benefits:
Medical/Dental/Vision coverage
401(k) plan
Tuition reimbursement program
Paid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays)
Paid Parental Leave
Paid Caregiver Leave
Additional sick leave beyond what state and local law require may be available but is unprotected
Adoption Reimbursement
Disability Benefits (short term and long term)
Life and Accidental Death Insurance
Supplemental benefit programs: critical illness/accident hospital indemnity/group legal
Employee Assistance Programs (EAP)
Extensive employee wellness programs
Employee discounts up to 50% off on eligible AT&T mobility plans and accessories,
AT&T internet (and fiber where available) and AT&T phone.
#LI-Onsite – Full-time office role-
Ready to join our team? Apply today!
Weekly Hours:
40Time Type:
RegularLocation:
Atlanta, Georgia, USA:TX:Dallas / One AT&T Plaza (208 S Akard - Whitacre Tower) - Adm:208 S Akard StSalary Range:
$106,100.00 - $178,200.00It is the policy of AT&T to provide equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, AT&T will provide reasonable accommodations for qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made.
Job ID R-110104-1 Date posted 05/22/2026
Benefits
Your needs? Met. Your wants? Considered. Take a look at our comprehensive benefits.
- Paid Time Off
- Tuition Assistance
- Medical and dental plans
- Discounts
- Training & Development
Our hiring process
Apply Now
Confirm your qualifications align with the job requirements and submit your application.
Assessments
You may be required to complete one or more assessments, depending on the role.
Interview
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Conditional Job Offer
We’ll reach out to discuss a conditional job offer and the next steps to joining the team.
Background Check
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Welcome to the Team!
Congratulations! It’s time to experience #LifeAtATT.
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