Mississauga, On Linux systems administrator Jobs – 38 Openings This Week

ThreatLocker Specialist
Celestica —Toronto, ON
- $89,355–$124,779 a year
- Remote
- Azure
- CAD
- Windows
Azure Architect & Administrator
AtkinsRéalis —Mississauga, ON
- Full-time
- Hybrid work
- Azure
- DevOps
- Scripting
CyberArk Support Engineer
KeyData Cyber —Toronto, ON
- $35–$45 an hour
- Immediate opening
- Remote
- Azure
- Computer Science
- Engineering
Quick apply
Senior System Administrator
fgf brands —Greater Toronto Area, ON
- Full-time
- Azure
- Computer Science
- Software troubleshooting
- Tuition reimbursement
Senior Information and Data Security Analyst (Global Security)
Royal Bank of Canada —Toronto, ON
- Full-time
- Databases
- APIs
- Financial services
Site Reliability Engineer
KPMG —Toronto, ON
- $105,000–$156,600 a year
- Full-time
- Microsoft Excel
- Azure
- DevOps
Senior JDE CNC Administrator
IKO Industries Ltd. —Mississauga, ON
- Weekends as needed
- Oracle
- Windows
- Java
- Disability insurance
- Dental care

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Azure Architect & Administrator
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ThreatLocker Specialist

Celestica -
Toronto, ON

Apply Now

Job details

$89,355–$124,779 a year

Qualifications

Microsoft Windows Server
System administration
Azure
CAD
Accounting software
Windows
Incident response
CompTIA Network+
MacOS
Linux
Cybersecurity
CompTIA Security+
PowerShell
Active Directory
Help desk

Full job description

08 - Specialist, Information Security
Req ID: 137488
Remote Position: Hybrid
Region: Americas
Country: Canada
State/Province: Ontario
City: Toronto

Summary

This role is critical for ensuring endpoint application control remains secure and usable for engineering teams, particularly by acting as a dedicated support function during the stabilization phase of a "Default-Deny" rollout.

In this role, you will be responsible for designing, implementing, auditing, and maintaining ThreatLocker policies across our organization (and/or client environments). You will play a critical role in preventing ransomware, malware, and unauthorized software execution by managing Application Whitelisting (Allowlisting), Ringfencing, Storage Control, and Elevation Control.

The ideal candidate has a strong background in system administration or cybersecurity, possess a deep understanding of Windows operating systems, and is passionate about achieving a true Zero Trust security posture.

Key Responsibilities

ThreatLocker Administration & Management

Policy Creation & Tuning: Design, implement, and maintain ThreatLocker Application Allowlisting policies to ensure only authorized software can execute.
Ringfencing: Configure and manage Ringfencing policies to restrict what authorized applications can do (e.g., stopping PowerShell from talking to the internet or blocking Word from launching cmd.exe).
Elevation Control: Implement and manage least-privilege access, creating rules for users to run specific applications as administrators without granting full local admin rights.
Storage Control: Define and enforce policies for securing USB drives, network shares, and local files against unauthorized access or data exfiltration.
Manage allowlisting, Learning Mode, and temporary exceptions.

Monitoring, Auditing & Incident Response

Approval Queue Management: Monitor and process daily ThreatLocker approval requests from users efficiently, balancing security with operational productivity.
Learning Mode Audits: Review, analyze, and baseline new endpoints during the "Learning Mode" phase to ensure seamless transitions to "Secured Mode."
Log Analysis & Reporting: Investigate blocked files, denied executions, and policy violations. Use ThreatLocker audit logs to identify potential security incidents or shadow IT.
Integration: Collaborate with the SOC/SIEM team to forward ThreatLocker logs and integrate them into the broader security monitoring ecosystem.
Triage blocked applications, scripts, DLLs, and installers.
Track service metrics to ensure business productivity.

Maintenance & Strategy

Environment Maintenance: Keep ThreatLocker agents updated across all endpoints and servers.
Testing & Validation: Test software updates and patch deployments in a sandbox environment to ensure they comply with existing ThreatLocker rules before company-wide rollout.
Documentation: Maintain clear, up-to-date documentation of standard operating procedures (SOPs), policy exceptions, and approval workflows.
Maintain Ringfencing and policy standards.

Required Experience

ThreatLocker Expertise: Minimum of 3 years of hands-on experience specifically managing, configuring, and troubleshooting ThreatLocker in a production environment.
IT/Cybersecurity Background: 3+ years of experience in System Administration, Helpdesk Tier 3, Network Engineering, or a Cybersecurity operations role.
OS Proficiency: Deep, foundational knowledge of Windows OS (Registry, File Systems, Services, Active Directory, and Group Policy).
Experience with macOS or Linux is a strong plus.
Scripting: Basic familiarity with PowerShell or Command Prompt for troubleshooting and automation.

Knowledge/Skills/Competencies

Soft Skills

Analytical Thinking: Ability to dissect complex application dependencies (e.g., figuring out why a niche accounting software was blocked by a specific DLL file).
Customer-Centric Communication: Ability to explain security restrictions to non-technical staff diplomatically and find ways to enable business operations safely.
Attention to Detail: Zero Trust requires precision; a misplaced rule can either cause a security gap or halt business operations.

Preferred Certifications (A Plus, Not Required)

ThreatLocker Professional or ThreatLocker Expert certifications.
CompTIA Security+, CySA+, or Network+.
Microsoft Certified: Windows Server or Azure Administrator.

Physical Demands

Duties of this position are performed in a normal office environment.
Duties may require extended periods of sitting and sustained visual concentration on a computer monitor or on numbers and other detailed data. Repetitive manual movements (e.g., data entry, using a computer mouse, using a calculator, etc.) are frequently required.

Salary

The stated range includes Base Salary and target Short-Term Incentive (STI) compensation only. A comprehensive benefits package is offered in addition to this range.

The range described in this posting is an estimate by the Company, and may change based on several factors, including but not limited to a change in the duties covered by the job posting, or the credentials, experience or geographic jurisdiction of the successful candidate.

Salary Range: $89,355-124,779 CAD/year

Notes

This job description is not intended to be an exhaustive list of all duties and responsibilities of the position. Employees are held accountable for all duties of the job. Job duties and the % of time identified for any function are subject to change at any time.

Celestica is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, pregnancy, genetic information, disability, status as a protected veteran, or any other protected category under applicable federal, state, and local laws.
At Celestica we are committed to fostering an inclusive, accessible environment, where all employees and customers feel valued, respected and supported. Special arrangements can be made for candidates who need it throughout the hiring process. Please indicate your needs and we will work with you to meet them.

Apply Now

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linux systems administrator jobs in mississauga, on

ThreatLocker Specialist

Azure Architect & Administrator

CyberArk Support Engineer

Senior System Administrator

Senior Information and Data Security Analyst (Global Security)

Site Reliability Engineer

Senior JDE CNC Administrator

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