Senior Systems Engineer

Cleartech Recruiting; New York (NY); Hybrid; USD 140,000 - 180,000; Full time

Job summary

Cleartech Recruiting partners with a major global financial services firm to hire a Senior Systems Engineer who will own the Microsoft 365 platform across a complex, multi-tenant environment in NYC. This hybrid role intersects enterprise platform engineering, identity management, and integration programs.

The candidate will manage Exchange Online, SharePoint Online, Teams, and OneDrive; lead M&A migrations and cross-tenant integrations; oversee Entra ID/Azure AD, Power Platform governance, and

Qualifications

• 5+ years in a Microsoft 365 or enterprise systems engineering role within a large, complex organisation.
• Proven hands-on experience delivering M365 cross-tenant migrations and M&A integrations.
• Deep expertise in Exchange Online, SharePoint Online, and Teams administration at enterprise scale.
• Strong Entra ID / Azure AD skills including conditional access, app registrations, and guest identity management.

Responsibilities

• Owning Exchange Online, SharePoint Online, Microsoft Teams, and OneDrive across a large multi-tenant M365 environment
• Leading cross-tenant migrations and M&A integrations including mailbox migrations, Teams, SharePoint, and identity consolidation
• Managing multi-tenant organisation (MTO) architecture including cross-tenant sync, shared address book, Teams Connect, and calendar federation
• Administering Entra ID / Azure AD including app registrations, conditional access, RBAC, and guest identity management
• Owning Power Platform administration including environment governance and service principal management
• Managing email security standards including DMARC, SPF, and DKIM
• Handling domain migrations including DNS, SMTP namespaces, UPN changes, and coexistence management
• Operating within formal ITSM frameworks including change management, freeze windows, and incident response

Skills

Microsoft 365 administration

Cross-tenant migrations

M&A integrations

Stakeholder management

Enterprise platform engineering

Tools

Exchange Online

SharePoint Online

Microsoft Teams

OneDrive

Entra ID / Azure AD

Power Platform

Job description

Senior Systems Engineer – M365 & Enterprise Collaboration | NYC (Hybrid) | Global Financial Services

We're partnering with a major global financial services firm to find a Senior Systems Engineer to own their Microsoft 365 platform across a complex, multi-tenant environment shaped by ongoing M&A activity. This is a high-impact individual contributor role at the intersection of enterprise platform engineering, identity management, and corporate integration programmes.

What You'll Be Doing:

• Owning Exchange Online, SharePoint Online, Microsoft Teams, and OneDrive across a large multi-tenant M365 environment
• Leading cross-tenant migrations and M&A integrations including mailbox migrations, Teams, SharePoint, and identity consolidation
• Managing multi-tenant organisation (MTO) architecture including cross-tenant sync, shared address book, Teams Connect, and calendar federation
• Administering Entra ID / Azure AD including app registrations, conditional access, RBAC, and guest identity management
• Owning Power Platform administration including environment governance and service principal management
• Managing email security standards including DMARC, SPF, and DKIM
• Handling domain migrations including DNS, SMTP namespaces, UPN changes, and coexistence management
• Operating within formal ITSM frameworks including change management, freeze windows, and incident response

What They're Looking For:

• 5+ years in a Microsoft 365 or enterprise systems engineering role within a large, complex organisation
• Proven hands-on experience delivering M365 cross-tenant migrations and M&A integrations
• Deep expertise in Exchange Online, SharePoint Online, and Teams administration at enterprise scale
• Strong Entra ID / Azure AD skills including conditional access, app registrations, and guest identity
• Power Platform administration experience including PPAC and environment governance
• Familiarity with email security enforcement tooling (Valimail, EasyDMARC, or equivalent)
• Experience operating in a regulated, multi-entity environment with formal change management processes
• Strong written and verbal communication; able to manage complex stakeholders across a global team

Nice to Have:

• Experience with migration tooling such as BitTitan MigrationWiz, Quest On Demand, SPMT, or Sharegate
• PowerShell scripting for M365 and Entra ID automation
• Knowledge of financial services compliance requirements as they apply to email, archiving, and data governance
• Ansible automation and Power Platform development