System Specialist

Mississauga, ON
Hybrid
Posted Oct 10, 2026
1 position

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Employment type: Contract
Experience level: Senior · 5+ years
Posting language: English
Working hours: 35 hours per week
Seniority: Mid-Senior level
Application method: Direct apply is available

Job summary

Administer, maintain, troubleshoot, and optimize enterprise Exchange Server SE, Exchange Online, and hybrid messaging environments, including mailboxes, groups, connectors, and transport configurations. Maintain hybrid services and monitor messaging availability, performance, capacity, security, and operational health.

Job details

Position: IT System Specialist Duration: 3 Months assignment (contract) Client Location: Mississauga (Hybrid: 7 hours/day between 8:00 AM and 5:00 PM, Monday to Friday) Engagement Model: Professional Services Engagement – B2B (Incorporated Entities Only) Note on Assignment Type This position is provisionally Hybrid, requiring 7 hours per calendar day between 8:00 AM and 5:00 PM, Monday to Friday (excluding breaks). Conditions may change based on organizational requirements and at the discretion of the Hiring Manager. About the Engagement Akkodis is seeking an experienced IT System Specialist to provide expert administration, technical leadership, functional guidance, and third-level support for enterprise messaging and email-security services. The successful consultant will bring strong hands-on expertise with Microsoft Exchange Server Subscription Edition (SE), Exchange Online (EXO), Exchange Hybrid environments, Cisco Cloud Email Security Appliance (CES), Microsoft 365, Microsoft Entra ID, Exchange Online Protection (EOP), Microsoft Azure, and related cloud technologies. This role will work collaboratively with cybersecurity, infrastructure, identity, application, and operational teams to maintain the security, reliability, availability, and performance of enterprise messaging services. Scope Administer and support enterprise Exchange Server SE, Exchange Online, and Exchange Hybrid environments. Manage Exchange Hybrid architecture involving OAuth authentication, federation services, organization relationships, certificate management, hybrid mail flow, free/busy integration, mailbox migrations, and coexistence. Administer mailboxes, shared mailboxes, distribution groups, Database Availability Groups (DAGs), connectors, mail flow, and hybrid configurations. Assignment Deliverables Administer, maintain, troubleshoot, and optimize Exchange Server SE, Exchange Online, and Exchange Hybrid environments. Maintain hybrid-services functionality including OAuth, federation services, organization relationships, certificates, hybrid mail flow, mailbox migrations, coexistence, and free/busy integration. Administer mailboxes, distribution groups, shared mailboxes, Database Availability Groups (DAGs), connectors, transport configurations, and related messaging services. Monitor and maintain messaging-system availability, performance, capacity, security, and operational health. Expertise Required Must Have: Strong hands-on administration and technical support experience with Microsoft Exchange Server and Exchange Online (EXO) in enterprise environments. Strong experience administering and troubleshooting Exchange Hybrid architecture. Hands-on knowledge of Exchange Server Subscription Edition (SE) or closely related enterprise Exchange Server environments. Experience with OAuth authentication, federation services, organization relationships, certificate management, hybrid mail flow, free/busy integration, mailbox migrations, and cloud/on-premises coexistence. Strong experience administering mailboxes, shared mailboxes, distribution groups, DAGs, connectors, transport rules, and mail-flow configurations. Hands-on experience administering or supporting Cisco Cloud Email Security Appliance (CES) or comparable enterprise email-security platforms. Nice to Have: Experience onboarding enterprise applications and services requiring SMTP relay or other messaging functionality. Experience working collaboratively with cybersecurity, infrastructure, identity/access management, cloud, and application teams. Security Clearance Required. Important This is a business-to-business engagement. Candidates must represent an incorporated entity, hold a valid business number, maintain appropriate insurance, and invoice for services rendered. How to Apply Interested applicants are encouraged to submit their resumes in confidence to Mansi.Hasija@akkodisgroup.com or through LinkedIn directly. Accessibility: At Akkodis, part of The Adecco Group, our purpose is simple: to make the future work for everyone. We live our values, Passion, Collaboration, Inclusion, Courage, and Customers at Heart, by fostering a workplace where diversity is celebrated and every voice matter. We encourage applications from individuals of all backgrounds and identities. Together, we’re making the future work for everyone.

What you’ll do

Requirements

Requires strong enterprise administration and support experience with Microsoft Exchange Server, Exchange Online, and Exchange Hybrid, including hands-on knowledge of Exchange Server SE or a closely related environment. Candidates must have experience with hybrid authentication and mail-flow services, messaging administration, and Cisco CES or a comparable email-security platform; security clearance and an incorporated business entity are required.