Sr. Microsoft 365 Administrator

222312-973

Business Centre "Labirint" 5th Floor Liulin 10 District, Sofia, Sofia,

Not Applicable

Information Technology / Information Systems

Full-Time/Regular

About the Role

At Tungsten Automation, the Senior Microsoft 365 Administrator role serves as the organization’s expert for designing, managing, and optimizing the Microsoft 365 user-facing ecosystem. This role is responsible for ensuring the reliability, security, and performance of core collaboration and productivity services - including SharePoint Online, Teams, OneDrive, Power Platform, Azure DevOps and the embedded security/compliance tools. The Senior Administrator leads the planning and execution of M365 deployments, migrations, and enhancements, while establishing best practices and governance standards that support long-term scalability.

This position requires deep technical expertise, strong problem-solving skills, and the ability to collaborate with cross-functional teams. The Senior Administrator acts as a trusted advisor to IT leadership, providing guidance on modern workplace technologies, automation opportunities, and security posture improvements. They are also able to mentor junior administrators, manage complex incidents, and ensure the environment aligns with organizational policies, regulatory requirements, and industry best practices.

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Key Responsibilities

· Manage, configure, and optimize core M365 services including SharePoint Online, Teams, OneDrive, Power Platform, and Azure DevOps.

· Oversee and support the activities around our legacy Team Foundation Server (now Azure DevOps) together with Business Owners.

· Oversee tenant-wide settings, policies, and service configurations to ensure stability and performance of our M365 tools.

· Administer identity and access/permissions management for our M365 tools, including conditional access and role-based access controls.

· Implement and maintain security controls such as Data Loss Prevention (DLP), retention policies, sensitivity labels, and threat protection.

· Monitor and respond to security alerts, audit logs, and compliance center notifications.

· Develop and enforce governance standards for Teams, SharePoint, and collaboration tools.

· Support and troubleshoot daily M365 related user issues through incoming tickets in our Helpdesk system (Zoho).

· Lead advanced troubleshooting for complex M365 issues across services and integrated systems.

· Own and drive daily troubleshooting activities and engage with MS customer/application support teams on various topics via tickets as necessary.

· Serve as an escalation point for Business Stakeholders.

· Ensure high availability and reliability through proactive monitoring and maintenance.

· Own and drive continuous data cleanup activities to ensure appropriate storage capacity availability in SharePoint Online.

· Plan and execute migrations (e.g., SharePoint, file shares, identity systems) to Microsoft 365.

· Drive modernization initiatives such as automation, cloud adoption, and Zero Trust alignment.

· Collaborate with cross-functional teams to deliver new features, integrations, and service improvements.

· Support migration, decommissioning, and shutdown activities of legacy on-premises systems.

· Develop and maintain PowerShell scripts to automate administrative tasks and reporting.

· Implement workflow automation where possible using Power Automate, Graph API, or other M365 tools.

· Leverages generative AI and automation tools to enhance business processes, analyze trends, support decision-making, and improve employee or customer experiences.

· Create and maintain detailed documentation for configurations, procedures, and governance policies.

· Establish best practices for service usage, lifecycle management, and operational standards.

· Act as a subject matter expert and advisor to IT leadership on M365 strategy and roadmap.

· Support and maintain disaster recovery and backup plans for Microsoft 365 services such as SharePoint Online and OneDrive.

· Provide technical guidance across the organization.

· Partner with infrastructure, security, networking, and application teams to ensure cohesive system design.

· Develop and customize Microsoft 365 activity reports.

Required Qualifications / Experience

· Bachelor’s degree in Information Technology, Computer Science, or a related field (or equivalent professional experience)

· 5+ years of hands-on experience administering Microsoft 365 and related cloud technologies in a multinational organization

· Proven deep experience managing large-scale Microsoft 365 environments and core services: (SharePoint Online, Teams, OneDrive, Power Platform), migrations, and modernization initiatives

· Understanding of integration between M365 and third-party applications, security tools, and mobile device management

· Strong understanding of identity and access management, including conditional access, MFA, SSO and RBAC

· Proficiency with Microsoft 365 security and compliance tools (DLP, retention, sensitivity labels, threat protection)

· Advanced PowerShell scripting skills for automation, reporting, and bulk administration

· Experience with Microsoft Graph API, Power Automate, or other automation frameworks

· Solid understanding of networking fundamentals, DNS, certificates, and hybrid identity concepts

· Familiarity with Zero Trust principles and modern security best practices

· Ability to troubleshoot complex issues and communicate solutions clearly to both technical and non-technical stakeholders

· Server management knowledge and experience (patches, upgrades, migrations, decommissions)

· Well-organized personality with strong ability for critical thinking and attention to details

· Experience with working in global environments through different time zones

· Excellent analytical, problem-solving, communication and stakeholder engagement skills

· Ability to lead projects, collaborate across teams, and communicate technical concepts clearly

· Solid experience on different file share techniques (SPO, OneDrive; traditional file shares) and Azure AD management

· Strong documentation, planning, and organizational skills

· Experience using AI tools to analyze data, design workflows, optimize processes, or support strategic initiatives; ability to evaluate AI outputs for accuracy and bias.

Preferred Certification(s) / Knowledge

· Microsoft 365 Certified (nice to have): Enterprise Administrator Expert (highly valued) / Messaging Administrator / Teams Administrator / Security Administrator

· Azure or Cloud Administrator Associate (a plus)

· ITIL Foundation or similar service management certification

· Experience in a SaaS or software-driven environment

· Knowledge of Microsoft Intune/Endpoint Manager

· Ability to design prompts and workflows for AI tools.

· Experience testing, validating, and refining AI-generated outputs.

· Understanding of responsible AI use, ethics, and data governance.