Senior Infrastructure and IT Specialist – Microsoft 365

Job Objective

We are looking for a Senior Information Technology and Infrastructure Specialist with solid experience in Microsoft environment administration, infrastructure, endpoint security, and advanced support.

The position will be responsible for maintaining the availability, security, and correct functioning of IT services, managing the Microsoft 365 and Microsoft Entra ID environment, handling advanced level incidents and, primarily, identifying risks and needs before they become problems.

We are looking for a person with experience, technical judgment, a high sense of responsibility, and the ability to work autonomously, who does not limit themselves to reacting to tickets, but proposes and executes improvements.

Main Responsibilities

• Administer the Microsoft 365 environment, including users, groups, licenses, and services.
• Administer Microsoft Entra ID, identities, groups, roles, and access policies.
• Manage onboarding, offboarding, and modifications of users, permissions, and access.
• Administer and provide support for Windows 10/11 and Windows Server devices.
• Administer security policies, MFA, Conditional Access, and identity controls.
• Administer antivirus, antimalware, and endpoint protection (EDR) platforms.
• Monitor security alerts and execute containment and remediation actions.
• Administer and provide support for Exchange Online, SharePoint, OneDrive, and Microsoft Teams.
• Manage updates, patches, and device compliance.
• Handle N2/N3 incidents related to operating systems, applications, identities, infrastructure, and connectivity.
• Diagnose LAN/WAN, Wi-Fi, DNS, DHCP, and VPN connectivity issues.
• Monitor infrastructure capacity, availability, and performance.
• Maintain updated inventory and documentation of infrastructure and configurations.
• Coordinate escalations with manufacturers and vendors.
• Participate in change controls and maintenance windows.
• Identify vulnerabilities, risks, obsolescence, and single points of failure.
• Propose and implement improvements in security, availability, automation, and efficiency.
• Document procedures and generate knowledge bases.

Required Experience

• Minimum 5 years of professional experience in Information Technologies, preferably in infrastructure administration and Microsoft services.
• Proven experience administering Microsoft 365 environments.
• Experience with Microsoft Entra ID / Azure AD.
• Experience with antivirus, endpoint protection, or EDR platforms.
• Experience handling second or third-level technical incidents.
• Experience working directly with users, vendors, and business areas.

Indispensable Technical Knowledge

Microsoft Ecosystem

• Microsoft 365.
• Microsoft Entra ID.
• Exchange Online.
• Microsoft Teams.
• SharePoint and OneDrive.
• Microsoft Intune.
• Windows 10/11.
• Windows Server.
• Active Directory and Group Policy.
• MFA and Conditional Access.

Security

• Enterprise antivirus and antimalware.
• Endpoint Protection / EDR.
• Vulnerability and update management.
• Identity and access security.
• Least privilege principles.
• Security incident management.

Experience with Microsoft Defender for Endpoint and other enterprise solutions such as CrowdStrike, SentinelOne, Sophos, Trend Micro, or equivalents will be valued.

Infrastructure

• LAN/WAN/WLAN.
• TCP/IP.
• DNS and DHCP.
• VLANs.
• VPN.
• Firewalls and basic perimeter security concepts.
• Infrastructure monitoring.

Desirable Knowledge

• Azure.
• Administrative task automation.
• Microsoft Defender.
• Microsoft Sentinel.
• Monitoring tools.
• Backup and recovery management.
• ITIL.
• Asset management and CMDB.
• Continuity and disaster recovery concepts.

Desirable Certifications

For this profile, I would not set a certification as an exclusive requirement. I would especially value Microsoft certifications related to:

• Microsoft 365 Administrator.
• Identity and Access Administrator.
• Endpoint Administrator.
• Azure Administrator.
• Microsoft Security.

ITIL Foundation and certifications related to infrastructure or cybersecurity would also be desirable.

Competencies

• Proactivity: identifies problems, risks, and improvement opportunities without waiting for someone to point them out.
• Responsibility and ownership: takes charge of issues until their resolution.
• Autonomy: ability to investigate, diagnose, and resolve problems with minimal supervision.
• Technical judgment: knows how to evaluate risks before making changes.
• Organization and follow-up: keeps pending tasks, documentation, and commitments under control.
• Service orientation: understands that IT supports business operations.
• Communication: can explain technical problems clearly to non-technical users and managers.
• Teamwork: coordinates appropriately with network specialists, security, vendors, and other areas.
• Analytical capacity and structured troubleshooting.
• Ability to work under pressure during critical incidents.

Education

Engineering or Bachelor's degree in Systems, Information Technologies, Informatics, Telecommunications, Electronics, or a related field.

Language

Intermediate or higher technical English, sufficient to consult documentation, work with manufacturer portals, and participate in support sessions.

Profile We Are Looking For

We are looking for a Senior and hands-on person who can receive a complex problem and analyze it from end to end, but who also has the maturity to detect that something must be done before an incident is generated.

We are not just looking for someone to administer Microsoft 365 accounts or handle tickets. We want a specialist who can review the environment, detect unupdated devices, backups that require attention, capacity issues, insecure configurations, unnecessary access, antivirus alerts, or infrastructure at risk, and say: "this needs to be corrected," propose how to do it, and see it through to its conclusion.

-Requirements-

• Minimum education: Upper secondary education - Technological High School years of experience Keywords: specialist, especialista, senior, sr