Under limited supervision, the Senior Systems Administrator administers all aspects of an advanced, distributed computer system supporting an important functional area of operations. Day-to-day tasks may involve any or all of the following: operating system administration, configuration of mail systems, system installation, SAN administration, fundamentals of security, installing third party software, etc.
Duties and Responsibilities:
. Plans and coordinates system utilization, and performs growth analysis and capacity planning
. Provides installation, support, and maintenance of servers and other computer systems
. Efficiently manage configuration of 200+ servers and services (web, e-mail, dns, etc)
. Implement/maintain monitoring and trending for all deployed servers and services
. Assists with planning for and responding to service outages and other problems (SLA's)
. Able to take on a leadership role in managing systems-related projects
. Must be able quickly and correctly diagnose problems with computer systems and introduce the best way to fix the problem
. Proficient in scripting or light programming
. Provide leadership and mentoring to other System Administrators
. Support a 24x7 staffing model with on-call shifts that include weekends and Holidays
. Other duties as assigned
Experience: Education, Experience and Skills:
. Bachelor of Computer Science preferred, minimum two years of college or equivalent post-high school education or experience
. 5+ years System Administration experience in a large-scale Unix (Linux/Solaris/BSD) environment required; Package management; Automated installs
. Thorough understanding of e-mail protocols and architectures; SMTP (including AUTH, submission), POP, IMAP. (RFC 5322, 5321, 2822, 2821, etc.)
. Experience with large LDAP deployments (OpenLDAP, etc.)
. Experience managing LAMP web-farms serving 10+ million page views daily; Memcached; Load-balancing. Apache configuration and operation
. Experience setting up and regularly using monitoring and trending tools (Zenoss, Cacti, Nagios, Resmon); Monitoring, trending experience for various services
. Experience with revision control systems and usage for managing systems configuration; SVN, Puppet, etc.
. Experience with managing, operating, monitoring backup systems
. Experience with large e-mail systems (1 million accounts); High performance MTA's (Ecelerity, IronPort, StrongMail, Bizanga, Coldspark); Zimbra (or similar) experience preferred
. Experience in an Enterprise SAN environment recommended; Familiar with block level access using FC and iSCSI, Director class FC switches in an HA environment; Multi-pathing; Knowledge of Linux and driver interaction; NetApp experience and Multi-SAN environment preferred
. Familiarity with fundamental networking/distributed computing environment concepts; can configure NFS, key-based ssh; DNS; familiar with basic networking concepts: switching, routing (BGP,(R)STP, source routing), firewalls, load-balancing at various layers
. Has a solid understanding of a UNIX-based operating system; understands paging and swapping, inter-process communication, devices and what device drivers do, filesystem concepts (inode, clustering, logical partitions)
. Experience with Solaris, ZFS, DTrace considered a plus
. Independent problem-solving, troubleshooting skills, team player, excellent communication skills all required
. Generally knows several programming languages used for scripting or automation of routine tasks (bash, Perl, PHP)
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