Senior System Administrator

About the Role

Five Rivers IT is a rapidly growing Managed IT support firm headquartered in Northern New Jersey, serving clients both locally and beyond. We are dedicated to delivering valued leadership and comprehensive managed IT support services to small and mid‑market companies. With a primary focus on delivering cost‑effective and secure solutions, we empower our partners to scale efficiently and confidently in today's competitive landscape.

We are currently seeking a Senior System Engineer to take ownership of managing and optimizing our AWS and Azure environments across both Windows and Linux platforms. In this role, you will support development workflows, ensure the security and reliability of our hybrid cloud infrastructure, and drive efficiency through automation. This position involves troubleshooting complex multi‑platform systems and network issues, performing regular system maintenance, and managing cross‑platform deployments.

The ideal candidate will bring deep expertise in both Windows and Linux administration, a strong focus on automation practices, and a proactive approach to solving challenges.

• Managing AWS/Azure cloud infrastructure supporting both Windows and Linux‑based workloads
• Root cause identification and remediation of security/system alerts across Windows and Linux environments
• Performing server and network troubleshooting using both Power Shell/GUI tools and Linux command‑line utilities
• Regular system maintenance including patch management for Windows Updates and Linux package updates
• Managing application deployments through CI/CD pipelines supporting both Windows and Linux targets
• Implementing and following change control processes for multi‑platform infrastructure modifications
• Documenting new procedures and maintaining runbooks for both Windows and Linux system operations
• Working on automation projects spanning Windows and Linux environments in a timely manner
• Participating in an on‑call rotation schedule for off‑hours escalations across all platforms

• At least 5 years of experience in Windows System Administration (Windows Server, Active Directory, Group Policy)
• Preferred 3 years of experience in Linux System Administration (RHEL, Debian, Ubuntu, CentOS/Rocky, Amazon Linux)
• At least 5 years of experience in Network Administration across Windows and Linux environments
• At least 3 years of experience managing Azure & Azure Dev Ops with both Windows and Linux pipelines
• At least 3 years of experience managing AWS environment including both Windows EC2 and Linux instances
• Proficiency in Power Shell for Windows automation and Bash/Python for Linux scripting
• Experience with containerization on both platforms (Docker on Windows/Linux, Windows Containers)
• Strong experience with Infrastructure as Code tools (Terraform, ARM templates, Cloud Formation)
• Understanding of cross‑platform networking:
  Active Directory, DNS, DHCP, VLANs, VPNs, and Linux networking
• Advanced understanding of protocols: TCP/IP, SMB/CIFS, SSH, RDP, SSL/TLS, Kerberos
• Strong motivation to automate operations across Windows and Linux using appropriate tools
• Experience with configuration management for both platforms (DSC, Ansible, Group Policy)
• Strong interpersonal and communication skills for cross‑functional collaboration
• Ability to multi‑task and prioritize in mixed Windows/Linux environments
• Excellent collaboration skills and ability to work in hybrid Dev Ops teams

• Full‑time position
• Location:
  
  Fair Lawn, NJ (local or willing to relocate)
• Standard benefits: medical, dental, vision insurance and vacation time
• Encouragement and reward for professional certifications
• Salary based on experience – please include expected salary in your application; submissions without expected salary will not be considered