Rackspace Senior Security Systems Administrator - Linux in San Antonio, Texas

Overview & Responsibilities

We are seeking a Senior Security Systems Administrator to supervise maintenance and administration activities within the Rackspace Cyber Security infrastructure and provide an advanced level of technical support to the ISOC/Rackers over the phone, chat and/or via support tickets. In this role you will take ownership of complex system/application issues. You will appy creative problem-solving techniques to identify the source of problems, while at the same time keeping the ISOC/Racker aware of resolution progress via the ticketing system. You will analyze configurations, use initiatives and advise on potential pitfalls that an end user may experience using existing or planned methods and suggests alternatives that may better serve the stability of their solution. You will propose and implement system enhancements (software and hardware updates) that will improve the performance and reliability of the system. You will solve end user technical issues, which may include OS, level, webserver, database server, security applications, DNS, SMTP, user management and permissions, or other software issues.


  • Oversees level-appropriate ISOC/Racker requests via phone, chat, and the ticket system.

  • Escalates support requests according to escalation procedures.

  • Schedules and coordinates level-appropriate maintenance.

  • Troubleshoots and resolves system service issues and OS level issues.

  • Receives and resolves issues escalated from lower level admins.

  • Creates and maintains end user loyalty by serving the ISOC/Rackers above and beyond their expectations.

  • Due to the 24x7 operations of the business, must be able to work a flexible work schedule, may include nights, weekends, holidays and emergency situations.


An ideal candidate will have:

  • Advanced knowledge of servers/computer hardware and software. Strong knowledge of platforms or systems used for:

  • SIEM

  • Packet Capture

  • SSL Decryption

  • Malware Detection

  • IDS

  • Network Monitoring Tools

  • Ticketing System

  • Knowledge Base

  • Web Security Gateways

  • Email Security

  • Data Loss Prevention

  • Anti-Virus

  • Network Access Control

  • Encryption

  • Vulnerability Management

  • Advanced working knowledge of network fundamentals, including diagnostics with UNIX and Windows system tools.

  • Advanced knowledge of Windows 2008/2012 server, IIS 5 & 6, active directory, DNS, SMTP, and TCP/IP.

  • Expert troubleshooting of OS, IIS and SQL.

  • Advanced knowledge of DNS, including diagnostics with Windows and UNIX tools.

  • Expert working knowledge of Linux OS.

  • Expert knowledge of network fundamentals.

  • Advanced knowledge of relevant web services, mail, MBU, Linux, MySQL and monitoring applications.

  • Drive to continually expand knowledge in the areas of new technological developments and trends.

  • Attention to detail in documenting information and ability to show ownership of follow through in security system resolutions.

  • Solid problem-solving abilities coupled with a desire to take on responsibility.

  • Strong written and verbal communications skills.

Required Qualifications:

  • Requires a high school diploma/GED. Bachelor’s degree in Computer Science or related field preferred.

  • 4 - 6 years system administration experience

  • One or more of the following Linux+, RHCSA, RHCE, and MCSE/MCSA certifications required.

Req # 39581

Category Cyber Security

About Rackspace

Rackspace is modernizing IT in today’s multi-cloud world. We have been honored by Fortune, Forbes, Glassdoor and others as one of the best places to work. We serve over 50% of the Fortune 100 companies & customers in 120 countries around the globe. Our achievements are powered by our people – we call them Rackers. We grow & thrive through world-class development opportunities, learning & selling bleeding-edge technologies & solutions, and most importantly, connecting with each other (the best & brightest in the industry). Are you a Racker? Join us!

More on Rackspace

Rackers aren’t all alike. We look different. We think uniquely. We are from many places and our beliefs & backgrounds vary. But, being a Racker — a valued member of a winning team on an inspiring mission – is what connects us all. Rackers are encouraged to bring their whole self to work every day, as we know that unique perspectives fuel innovation and enable us to best serve our customers & communities around the globe. We welcome you to apply today and want you to know that we are committed to offering equal employment opportunity without regard to age, color, disability, gender, gender reassignment or identity or expression, genetic information, marital or civil partner status, pregnancy or maternity status, military or veteran status, nationality, ethnic or national origin, race, religion or belief, sexual orientation, or any legally protected characteristic. If you have a disability or special need that requires accommodation, please let us know.