Senior Windows Engineer

Th ideal candidate has deep expertise in Microsoft 365, Exchange (Online and On‑Premises), Microsoft Teams and enterprise messaging platforms. In this role, you will be responsible for technical leadership, architecture-level decision making, and delivery of complex messaging and infrastructure initiatives in a large, regulated enterprise environment.

Responsibilities

• Serve as a senior technical authority for Microsoft 365 and Exchange, including hybrid Exchange architectures.
• Design, implement, and maintain Exchange Online and Exchange On‑Premises environments, including mail flow, transport, migrations, and coexistence.
• Lead messaging and directory migration initiatives, including tooling such as Quest On Demand.
• Own and integrate email security platforms, including Proofpoint, ensuring reliability, security, and compliance.
• Drive end‑to‑end delivery of infrastructure and messaging projects, including upgrades, migrations, and modernization efforts.
• Partner with architecture, security, and operations teams to define technical standards and roadmaps.
• Author and maintain advanced PowerShell automation for administration, reporting, and operational efficiency.
• Act as escalation point for complex M365, Exchange, Active Directory, and Teams issues.
• Participate in vendor evaluations, solution design, and capacity planning.
• Operate within ITIL-based service management frameworks and support change, incident, and problem processes.
• Produce high‑quality technical documentation and provide clear stakeholder communication.
• Participate in on-call rotation with senior-level responsibility and ownership.

• At least 8+ years of experience supporting enterprise Windows and Microsoft messaging platforms (financial services experience preferred).
• Advanced hands-on experience with Microsoft 365 and Exchange (Online and On‑Premises) in hybrid environments.
• Strong experience designing and supporting Microsoft Teams including Voice / Calling solutions
• Proven leadership in delivering large-scale messaging or infrastructure projects.
• Experience with Quest On Demand for migrations or hybrid integrations.
• Expertise supporting Proofpoint or equivalent email security platforms.
• Advanced PowerShell scripting skills.
• Deep understanding of Active Directory, Windows Server, and identity integrations.
• Strong working knowledge of ITIL-based service management (ServiceNow preferred).
• Excellent technical judgment, communication, and stakeholder engagement skills.

• Experience with VMware Horizon, Azure Virtual Desktop (AVD)

Other Requirements

Mizuho has in place a hybrid working program, with varying opportunities for remote work depending on the nature of the role, needs of your department, as well as local laws and regulatory obligations. Roles in some of our departments have greater in-office requirements that will be communicated to you as part of the recruitment process.

Company Overview

Mizuho Financial Group, Inc. is the 15th largest bank in the world as measured by total assets of ~$2 trillion. Mizuho's 60,000 employees worldwide offer comprehensive financial services to clients in 35 countries and 800 offices throughout the Americas, EMEA and Asia. Mizuho Americas is a leading provider of corporate and investment banking services to clients in the US, Canada, and Latin America. Through its acquisition of Greenhill , Mizuho provides M&A, restructuring and private capital advisory capabilities across Americas, Europe and Asia. Mizuho Americas employs approximately 3,500 professionals, and its capabilities span corporate and investment banking, capital markets, equity and fixed income sales & trading, derivatives, FX, custody and research. Visit www.mizuhoamericas.com.

Mizuho Americas offers a competitive total rewards package.

We are an EEO/AA Employer - M/F/Disability/Veteran.

We participate in the E-Verify program.

We maintain a drug-free workplace and reserve the right to require pre- and post-hire drug testing as permitted by applicable law.