Are you ready to take your system administration expertise to the next level in support of mission-critical operations? At Independent Software, we're committed to building resilient, secure, and scalable IT environments that serve national security goals. As a Level 3 System Administrator, you'll join a high-performing technical team solving complex challenges across enterprise infrastructure. If you thrive in a collaborative environment and want to make a measurable impact while working with cutting-edge systems, Independent Software is where you belong. As a Level 4 System Administrator at Independent Software, you will be responsible for supporting, maintaining, and optimizing enterprise IT systems across multiple platforms including UNIX, Linux, and Windows. You will provide Tier 1 through Tier 3 support, resolve escalated issues, and ensure system integrity through patch management, vulnerability scanning, and compliance enforcement. You will also support architectural planning and hardware/software integration across a variety of classified and unclassified networks.