Senior Manager, OneStream Platform

The Manager, EPM Platform leads governance, change management, controls, and operational oversight of the organization's OneStream and Hyperion environments while managing a team of EPM Administrators. This role serves as the primary liaison between business stakeholders, administrators, and third-party consultants, ensuring secure, compliant, and efficient delivery of EPM platform services and the successful transition away from Hyperion.

Client Details

The company operates in the property industry and is based in Mississauga.

Description

Responsibilities:

Serve as the single point of accountability and "quarterback" for all OneStream-related requests coming in from the business.

Triage incoming requests for priority, complexity, and risk, and determine the appropriate resourcing path - the EPM Administrators, third-party MSO consultants, or a combination of both.

Engage directly with business stakeholders to clarify scope, gather requirements, set expectations, and provide status updates through to resolution.

Act as the day-to-day relationship owner with third-party MSO consultants, directing their work, reviewing deliverables, and holding them accountable to timelines and quality standards.

Reinforce EPM as the mandatory first point of contact for all OneStream requests, redirecting stakeholders who attempt to bypass the intake process.

Own and continuously improve the change management framework for the OneStream platform, covering configuration, security, integrations, and reporting/planning logic.

Maintain a complete, auditable change log/register for the OneStream environment.

Plan and coordinate release and deployment schedules to minimize disruption during peak business cycles (month-end, quarter-end, budget, and forecast).

Design, implement, and enforce governance protocols and standard operating procedures for OneStream administration and system change.

Define, monitor, and enforce security, access, and segregation-of-duties controls in partnership with the EPM Administrators.

Ensure OneStream administration and change activity meet internal controls, audit, and regulatory requirements.

Own and maintain governance documentation, including policies, procedures, RACI, and control frameworks for the EPM environment.

Manage the ongoing relationship with third-party MSO consultants, directing their work and holding them accountable to timelines, deliverable quality, and scope.

Oversee Testing/QA and User Acceptance Testing (UAT) cycles for OneStream releases, ensuring they follow the established change management protocol.

Ensure system and control documentation remains current and reflects the live-state configuration of the platform.

Directly manage the two EPM Administrators (OneStream and Hyperion), including workload planning, performance management, coaching, and professional development.

Own the Hyperion end-of-life transition plan, coordinating accessibility and operational update cut-off ahead of the end-of-2026 sunset date with stakeholders.

Recruit, onboard, and develop EPM Administrator talent, and foster teamwork and knowledge-sharing across the OneStream and Hyperion functions.

Own budgetary and financial oversight of third-party MSO consultant spend, including statements of work, invoice/effort accuracy, and OneStream licensing costs, in partnership with the Sr. Director, Data & Analytics.

Qualifications:

Post-secondary Diploma or University Degree in Computer Science, Accounting/Finance, Business, or a related discipline.

OneStream certification (Administrator or Design) is strongly preferred.

Accounting and financial knowledge is a strong asset, given the controls and compliance focus of the role.

5-7+ years of experience in EPM/financial systems administration, IT governance, or systems delivery, including hands-on OneStream experience (Hyperion or comparable EPM platform experience considered).

Demonstrated experience designing, implementing, or enforcing change management processes for enterprise systems.

Experience designing or enforcing IT governance, controls, or compliance protocols; SOX or internal audit experience is an asset.

Experience managing third-party vendors, managed service providers, or consultants, including SOWs, deliverables, and performance accountability.

Experience acting as a liaison between business stakeholders and technical teams; prior direct people-management experience, including performance management and coaching, is preferred.

Strong understanding of change management practice and IT general controls (ITGCs) as applied to enterprise/financial systems, and working knowledge of OneStream functionality (consolidation, reporting, planning, security) sufficient to triage and validate technical requests without requiring deep hands-on administration.

Skilled at directing and holding external consultants/MSOs accountable to scope, timelines, and quality.

Profile

• The successful candidate will bring 5-7+ years of experience in EPM platforms, financial systems administration, IT governance, or enterprise systems delivery, with strong exposure to OneStream, Hyperion, or comparable solutions. They will possess a solid understanding of change management, IT general controls, governance frameworks, security controls, and audit requirements within complex enterprise environments. The ideal candidate will be an effective people leader with experience managing technical teams, coaching employees, and coordinating third-party consultants and managed service providers. They will excel at balancing stakeholder expectations, prioritizing competing demands, and translating business requirements into actionable technical work. Strong communication, sound judgment, attention to detail, and the ability to drive accountability across teams and vendors will be critical to success in this highly visible leadership role.

Job Offer

• Opportunity to lead governance and change management for a strategic enterprise performance management platform.

• Direct people leadership responsibility, including coaching and developing a team of EPM Administrators.

• High visibility across business, technology, and executive stakeholders as the primary EPM platform owner.

• Exposure to a major platform transformation, including the Hyperion transition and OneStream optimization.

• Broad experience managing vendors, controls, audits, compliance processes, and enterprise-wide system initiatives.

MPI does not discriminate on the basis of race, religion, sex, sexual orientation, gender identity or expression, age, disability, marital status, or based on an individual's status in any group or class otherwise protected under applicable human rights legislation. MPI encourages applications from minorities, women, the disabled and all other qualified applicants