Exchange IT Specialist in Mississauga

Closing Date: October 2, 2026, 2:00 p.m. (Eastern Standard Time)

Employment Type: Contract (3 months)

Start Date: Immediate

End Date: 3 months from start date

Work Schedule: 35 hours per week

Salary: $50.39 per hour (contractors must be incorporated)

Consider your new role with Aliant Resources and our municipal government client The City of Mississauga.

About Us: Aliant Resources is a dedicated provider of IT staffing services, committed to promoting diversity, equity, inclusion, belonging, anti-racism, and accessibility in all facets of our operations.

Duties and Responsibilities

• Exchange Administration & Hybrid Operations
  • Administer and manage Exchange Hybrid architecture which includes OAuth authentication, federation services, organization relationships, certificate management, hybrid mail flow, free/busy integration, mailbox migrations, and coexistence between EXO and SE.
  • Manage mailboxes, distribution groups, shared mailboxes, Database Availability Groups (DAG), mail flow, connectors, and hybrid configuration.
  • Monitor system health, performance, capacity, and service availability.
  • Plan and implement Exchange upgrades, patches, migrations, and maintenance activities.
  • Troubleshoot complex messaging, mail routing, and calendar-related issues.
• Email Security & Cybersecurity Collaboration
  • Administer and maintain the Cisco Cloud Email Security Appliance (CES) environment.
  • Collaborate with the Cyber Security team to identify and remediate vulnerabilities impacting messaging systems.
  • Develop, implement, maintain, and optimize email security policies, content filtering rules, anti-spam, anti-malware, threat protection controls, sender reputation controls, HAT policies, encryption policies, message filters, and allow/block lists.
  • Support incident investigations involving phishing, malware, FOI requests, and other email-based threats.
  • Participate in security audits, compliance reviews, and remediation initiatives.
• Email Delivery & Application Integration
  • Work with application and infrastructure teams to configure and troubleshoot: SMTP relay services, SPF, DKIM, and DMARC configurations, mail routing and transport rules, third-party application integrations.
  • Assist in onboarding new applications and services requiring email functionality.
  • Ensure reliable and secure email delivery across cloud and on-premises systems.
• Operational Support
  • Manage and resolve incidents, service requests, and change requests through ServiceNow.
  • Develop and maintain technical documentation, standard operating procedures, and knowledge base articles.
  • Provide technical guidance to cross-functional teams to support and troubleshoot messaging services hosted across Microsoft 365, Microsoft Entra ID, Exchange Online Protection (EOP), Microsoft Azure, and AWS-integrated workloads.
  • Participate in incident response activities as required, including troubleshooting and remediation of critical messaging and security issues.
  • Provide occasional after-hours support for planned maintenance, system upgrades, and emergency incidents.

Skills and Qualifications

• Post-secondary degree or diploma in Computer Science or a related discipline, combined with a minimum of five (5) years of experience.
• Microsoft certifications related to Microsoft 365, Exchange, Azure, and/or Security are considered an asset.
• Experience working in a municipal government or public-sector environment.
• Knowledge of compliance, records retention, email governance, and regulatory requirements.
• Experience administering and supporting Microsoft Exchange Server Subscription Edition (SE) and Exchange Online (EXO), including migrations, mail flow, routing, retention policies, transport rules, filters, eDiscovery, and industry best practices.
• Experience with PowerShell automation and scripting for Exchange administration and operational tasks.
• Excellent analytical, problem-solving, and troubleshooting skills.
• Excellent communication, interpersonal, and customer service skills.
• Demonstrated ability to work independently with minimal supervision, as well as collaboratively within project teams to meet established timelines.
• Ability to provide expert technical advice, guidance, and recommendations on IT-related issues to clients, colleagues, management, committees, and cross-functional teams.

Security Credentials:

• Three (3) professional reference checks
• Criminal Background Check
• Additional client security screening may be required before onboarding.

At Aliant Resources, we value diversity and inclusion and we encourage candidates of all backgrounds to apply. We are an equal opportunity employer and we look forward to welcoming you to our team.

Diversity Statement: At Aliant Resources, we are committed to building a workforce that reflects the communities we serve and to promoting a diverse, anti-racist, inclusive, accessible, merit-based, respectful, and equitable workplace.

Accessibility Statement: Aliant Resources is dedicated to making our recruitment process accessible to everyone with or without a disability. We adhere to workplace accessibility standards to ensure that individuals with disabilities can fully participate in employment opportunities. We understand the importance of identifying and removing barriers, and we strive to provide an inclusive experience for all candidates.

Workplace Accommodations: We offer workplace accommodations throughout the recruitment process and all aspects of employment consistent with the requirements of the AODA and OHRC. If you require workplace accommodations due to a disability, injury, illness, or any other condition that may affect your ability to apply online or perform essential job functions, please reach out to us at accommodations@aliantresources.com. Your request will be answered, and we will collaborate with you to provide appropriate workplace accommodations as required.