Senior System Administrator Jobs

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Senior System Administrator

We are seeking a highly qualified Senior System Administrator, known for their d...

Location

Canada , Brockville

Salary:

Not provided

Biscuits Leclerc Ltd

Expiration Date

Until further notice

Requirements

Degree in Computer Science or a related field
Minimum of 10 years of experience in complex system administration
Proficiency in Azure and AWS cloud environments
Advanced expertise in Windows server administration
In-depth knowledge of Entra and Active Directory
Strong experience with Intune
Mastery of Fortinet products
Demonstrated ability to work with discipline, take initiative, and operate autonomously
Strong teamwork and advisory skills across technical and non-technical stakeholders
Analytical mindset focused on continuous improvement

Job Responsibility

Make critical decisions regarding system architecture with precision and strategic insight
Manage and maintain Windows and Linux servers with a focus on reliability and performance
Administer and optimize cloud services (Azure, AWS) independently
Handle identity and access management using Entra and Active Directory
Supervise and configure Intune for device and server management
Ensure network security and administration using Fortinet and Cisco products
Implement and maintain effective backup and disaster recovery solutions
Collaborate actively with internal teams in a spirit of teamwork
Provide advanced technical support and act as an advisor to colleagues and partners
Contribute to the ongoing improvement of administrative processes and tools

What we offer

Paid and adapted training
Complete benefits program (drug and dental insurance, 1 week of sick leave [conditions apply], telemedicine, group RRSP with employer participation and more)
Quality meals at low prices in the cafeteria (unlimited coffee, tea, cookies and bars)
Free use of the sports facilities (basketball court, training room and cardio room)
Save on our delicious products and discover exclusive novelties
Job security and opportunities for advancement within the company
Rich company culture (Christmas, birthday and maternity gifts, use of the Poka platform and more)

Fulltime

Senior IT Systems Administrator

At Lunar Energy, we're on a mission to transform the way we power our homes by b...

Location

United Kingdom , London

Salary:

Not provided

Lunar Energy

Expiration Date

Until further notice

Requirements

A minimum of 5 years' work experience within IT Systems administration in any sector
Proficiency in Okta and Google Workspace administration
Experience with Okta Workflows for workflow automation
Expertise in MacOS and Windows device support & management - 2nd/3rd line level support essential
Familiarity with MDM solutions for Windows and macOS
Proficiency in network administration - layer 2 and 3 switching, VLANs, DNS, DHCP, firewalls, VPNs.
Experience in Domain name and DNS management
Excellent communication skills, with the ability to talk and present to a range of audiences, sometimes acting as a translator between parties
Excellent attention to detail and a methodical approach
The ability to motivate others and guide change

Job Responsibility

Administer the company’s SaaS platforms, as well as support remote users with day-to-day issues.
Implement a new automation or integration system between our services to streamline data flows, and document it for future reference.
Evaluate and respond to end-user requests for new features or functionality.
Identify issues with and optimise IT processes or platform integrations.
Research and recommend new products or services.
Ensure smooth delivery and operation of IT services by monitoring system performance.
Provide 1st/2nd/3rd line support to colleagues concerning issues with their devices, the office network infrastructure or SaaS platform integrations.
Run training sessions for end-users on how to get the most from a given platform.
Problem determination and incident management of network and connectivity issues
Operational performance monitoring and analysis of internal networks

What we offer

Competitive Salary and stock options package
Private Medical Insurance scheme through BUPA (medical history disregarded)
A wellbeing and lifestyle benefits plan through Medicash
Enhanced Pension contributions: employer contributions matching 5%
A budget for work related training of £1,000 per financial year and an allowance of 4 training days
Cycle To Work scheme and Workplace Nursery benefit
£200 upon joining for remote work set-up
Access to Spill - Mental Health Support platform
Enhanced Maternity + Paternity Pay
25 days annual holiday entitlement + 8 Bank Holidays

Fulltime

Senior System Administrator

As a Senior System Administrator at Exor International, you will manage, maintai...

Location

Italy , San Giovanni Lupatoto

Salary:

Not provided

EXOR International

Expiration Date

Until further notice

Requirements

Proven experience (5+ years) as a system administrator or in similar roles
Strong knowledge of Windows Server operating systems in hyperconverged server farm environments (Nutanix) and virtualization platforms (VMware)
Experience with monitoring tools (PRTG)
Good understanding of network protocols, DNS, DHCP, TCP/IP
Knowledge of Microsoft authentication services (AD and Entra ID)
Experience with Sophos Firewall, End Point Security, and VPN
Familiarity with mail relay servers (Libra Esva) and email management using Exchange Online
Ability to work independently and manage complex projects
Good written and spoken English
Willingness to travel occasionally to company locations

Job Responsibility

Manage and monitor physical and virtual servers (Windows/Linux)
Administer cloud environments (Azure)
Configure and maintain networks, firewalls, VPNs, and security systems
Automate processes using scripting (e.g., Bash, PowerShell) with MDM and EDB (Baramundi)
Oversee backups (Veeam) and disaster recovery (Nutanix asynchronous replication)
Provide second- and third-level technical support
Manage vulnerability assessments and implement remediations
Maintain technical documentation and update IT policies

Fulltime

Senior Systems Administrator

ExoAnalytic Solutions is seeking an exceptionally talented Senior Systems Admini...

Location

United States , El Segundo

Salary:

120000.00 - 150000.00 USD / Year

ExoAnalytic Solutions

Expiration Date

Until further notice

Requirements

BS in Computer Science, Computer Engineering, or similar
CompTIA Security+
5+ years managing a classified network
United States citizenship required
Existing TS/SCI is required
solid understanding of troubleshooting and configuration of Windows servers and workstations in a classified environment
self-sufficient
quick learner
must be able to adapt quickly to evolving technology and priority changes
Current TS/SCI clearance

Job Responsibility

Maintain compliance with all classified network rules and regulations
Maintain all required classified network documentation reflecting the current operational environment
Install and configure Windows operating systems to include Server 2016 and Windows 10
Configure server and workstation hardware according to system requirements
Utilize approved software to manage software patching of servers and workstations
Utilize approved software to manage anti-virus policies and update definitions
Create, modify, and delete user accounts and groups in Active Directory
Troubleshoot server, workstation, and user experience issues
Create and configure virtual machines as necessary
Experience with NTFS file and share permissions

What we offer

company-paid medical, vision, and dental coverage
access to a 401(k) Retirement Plan with a 6% contribution made by the company without requiring any match from the employee
ample paid personal time off, including holidays
short and long-term disability insurance
life insurance
various other discounts and perks
flexible schedule
structured freedom that allows employees to innovate

Fulltime

Senior System Administrator

At Centrico, we bring innovation to the banking and fintech world with our open ...

Location

Italy , Biella

Salary:

Not provided

Centrico

Expiration Date

Until further notice

Requirements

Bachelor’s Degree in Informatics
Excellent diagnostic and problem solving skills
Curiosity, innovative spirit and always willing to stay up-to-date
Teamwork skills and ability to build strong inter-personal relationships
Good work organization skills and compliance with deadlines
Fluent English required
Excellent knowledge of load balancers - F5 Networks preferred
Excellent knowledge of Checkpoint technology, Fortinet firewalls
Strong skills in Cloud and Hybrid Cloud environments (Microsoft AZURE preferred)
Excellent knowledge of L2 and L3 switches

Job Responsibility

Management of the Group Network infrastructure (balancers, firewalls, switches, AS, etc ...)
Coordination of ordinary and extraordinary activities of the tlc carrier for the Group WAN
Management of the Group WAN infrastructure (routers, switches, Wi Fi, etc ...)
Design and management of Cloud and Hybrid Cloud environments
IT Operations architectures definition and setting

Senior System Administrator

At Centrico, we bring innovation to the banking and fintech world with our open ...

Location

Italy , Biella

Salary:

Not provided

Centrico

Expiration Date

Until further notice

Requirements

Bachelor’s Degree in Informatics
Excellent diagnostic and problem solving skills
Curiosity, innovative spirit and always willing to stay up-to-date
Teamwork skills and ability to build strong inter-personal relationships
Good work organization skills and compliance with deadlines
Fluent English required
Excellent knowledge of load balancers - F5 Networks preferred
Excellent knowledge of Checkpoint technology, Fortinet firewalls
Strong skills in Cloud and Hybrid Cloud environments (Microsoft AZURE preferred)
Excellent knowledge of L2 and L3 switches

Job Responsibility

Management of the Group Network infrastructure (balancers, firewalls, switches, AS, etc ...)
Coordination of ordinary and extraordinary activities of the tlc carrier for the Group WAN
Management of the Group WAN infrastructure (routers, switches, Wi Fi, etc ...)
Design and management of Cloud and Hybrid Cloud environments
IT Operations architectures definition and setting

Senior Systems Administrator

Drive automation and modernization to truly impact mission success. This is an o...

Location

United States , Annapolis Junction

Salary:

150000.00 - 250000.00 USD / Year

LufCo

Expiration Date

Until further notice

Requirements

Bachelors degree in a Technical field
5 years of additional experience as a Systems Administrator may be substituted for a Bachelors degree
SA2: 10+ years of experience in System Administration on programs or projects of similar scope, type, and complexity
SA3: 15+ years of experience in System Administration on programs or projects of similar scope, type, and complexity
Skills: Linux
Ansible
Shell scripting
Active TS/SCI with Polygraph clearance

Job Responsibility

Implementation, troubleshooting, and maintenance of IT systems leveraging automation frameworks
Improve and monitor the daily activities of system configuration and operation across a full stack of hardware and software
Excel at problem solving to support mission users and provide feedback to system designers and developers
Plan and update mission critical systems on a day-to-day basis without impacting a massive stakeholder community
Provide innovative methods of reliability and recovery improvements and assist in designing next generation deployment profiles for system modernization
Possess a helpful attitude for problem resolution and work issue escalation between users and system developers
Optimizes system operations and resource utilization, and perform system capacity analysis and planning
Provides in-depth experience in trouble-shooting IT systems
Offers support for the dispatch system and hardware problems and remains involved in the resolution process

What we offer

Competitive salary
generous PTO
health/dental/vision insurance
401K matching
tuition reimbursement
Paid Time Off
401K Contribution and Employer Match Contributions
Medical, Dental, and Vision Coverage

Fulltime

Senior Linux Systems Administrator

Aquila Technology is seeking a Senior Linux Systems Administrator to join our te...

Location

United States , Lexington

Salary:

Not provided

Aquila Technology

Expiration Date

Until further notice

Requirements

Must be a U.S Citizen
Must have an Active Secret Clearance (Green Cards / Visas do not qualify)
Willingness to undergo a comprehensive background investigation and maintain a personal security clearance
5 years – Networks
5 years – Networking Applications and Protocols: TCP/IP, DNS, NTP, DHCP, SSH, FTP and HTTP/S
5 years – SSH Server implementation, Linux Networking Configuration, Host Based Firewall, Web Server
5 years – Programming
5 years – Scripting Experience: Python, Ansible, TCL or Bash
5 years – Systems
5 years – Configuration of Distributed Environments, including NFS for Storage

Job Responsibility

Performing systems administration on Red Hat 8/9 servers, Red Hat Identity Management (IdM), and Red Hat Ansible Automation
Server performance optimization
Cyber security
OS and application patching
McAfee suite
Scripting
Storage
Disaster recovery

What we offer

PTO – 15 days (vacation/sick)
10 paid holidays – 6 standard (New Year’s, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas) – 4 floating holidays prorated based on your day of hire
1.5 paid days, or 12 hours, for approved volunteer work
1 week of paid maternity/paternity LOA after 1 year of Full-time employment
Tuition & Training Reimbursement – 5K annually for pre-approved, job-related tuition, certification, or professional conferences
401K with Fidelity 100% immediate vesting
Aquila matches 100% the fist 3%, then 50% on the next 2%
Cell Phone & Internet Reimbursed up to $150 monthly to cover cell phone, data, and home internet expenses
By Your Own Device (BYOD) Allowance Reimbursed up to $1500 for the purchase of a qualified technology device

Fulltime

Senior System Administrator

Biscuits Leclerc Ltd

Location:
Canada , Saint-Augustin-de-Desmaures

Category:
IT - Administration

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
December 26, 2025

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Senior System Administrator

Biscuits Leclerc Ltd

Location:Canada , Saint-Augustin-de-Desmaures

Category:IT - Administration

Contract Type:Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:December 26, 2025

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Location:
Canada , Saint-Augustin-de-Desmaures

Category:
IT - Administration

Contract Type:
Not provided

Job Posted:
December 26, 2025