Senior Systems Administrator

AT&T

Senior System Administrator responsible for advanced technical support for Linux-based messaging environments at AT&T. Ensuring reliable and scalable email delivery with strong focus on operational excellence.

Posted 5/22/2026full-timeAtlanta • Texas • 🇺🇸 United StatesSenior💰 $118,800 - $178,200 per yearWebsite

Tech Stack

Tools & technologies

DNSLinuxPerlShell ScriptingSMTPTCP/IPUnix

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

3+ years of related experience
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
Bachelor's degree (BS/BA) desired in Computer Science.

Benefits

Comp & perks

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.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Linux system administrationUnix system administrationSendmail configurationPostfix managementSMTPTCP/IPDNSSSL/TLSSSHshell scripting

Soft Skills

monitoringtroubleshootingvendor managementcollaborationproblem remediationcommunicationrisk assessmentservice availabilityauditingcapacity planning

Certifications

Bachelor's degree in Computer Science