Senior System Administrator

Job Description

Job Description

Senior System Administrator

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. Key responsibilities include troubleshooting complex multi-platform systems and network issues, performing regular system maintenance, 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. Success in this position requires thriving in a dynamic, fast-paced environment where adaptability and forward-thinking are highly valued.

Responsibilities :

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 PowerShell / 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

Document new procedures and maintain runbooks for both Windows and Linux system operations

Work on automation projects spanning Windows and Linux environments in a timely manner

Participate in an on-call rotation schedule for off-hours escalations across all platforms

Required Skills :

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 DevOps with both Windows and Linux pipelines

At least 3 years of experience managing AWS environment including both Windows EC2 and Linux instances

Proficiency in PowerShell 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, CloudFormation)

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 DevOps teams

Other Details about the Job

• This is a Full-Time position.
• All standard benefits are included such as medical / dental / vision insurance and vacation time.
• We encourage and reward professional certifications
• Salary will be based on experience. Please send your resume with the expected salary.  Applications lacking expected salary will not be considered.
• You will be placed at our Fair Lawn, NJ office,  Please do not apply if you are not local or are not willing to relocate.

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