Senior System Administrator – Microsoft 365, AWS & Servers

About the role

The Senior System Administrator is responsible for managing and optimizing the organization's cloud infrastructure, enterprise productivity services, and server environments. The role focuses on three core areas: Microsoft 365 Administration, Cloud Infrastructure Management (AWS or equivalent platforms), and Server Administration.

This role leads initiatives that enhance system performance, reliability, security, and operational efficiency while supporting the organization's cloud strategy, infrastructure improvements, and service delivery. The position also contributes to long-term infrastructure planning and provides technical leadership, guidance, and mentorship within the team.

Key Responsibilities

• Manage and administer Microsoft 365 services, including Exchange Online, Microsoft Entra ID, identity management, messaging, and collaboration platforms.

• Manage and optimize cloud infrastructure and services, particularly AWS or equivalent cloud platforms, ensuring availability, performance, security, and cost efficiency.

• Administer and maintain Windows Server and/or Linux environments, including configuration, monitoring, troubleshooting, and system optimization.

• Implement and maintain system security controls, access policies, monitoring, and compliance standards.

• Lead system enhancement initiatives, including automation, service optimization, and configuration improvements.

• Oversee cloud resource provisioning, lifecycle management, and cost optimization activities.

• Support the development of cloud and infrastructure strategies, standards, and best practices.

• Lead and participate in service migrations, upgrades, and integration projects.

• Collaborate with cross-functional teams to resolve complex technical issues and improve service delivery.

• Provide technical guidance and mentorship to junior administrators.

• Maintain accurate technical documentation, system configurations, and operational procedures.

About You / Qualifications

Core Technical Competencies

1. Microsoft 365 Administration

• Hands-on experience administering Microsoft 365, Exchange Online, and Microsoft Entra ID.

• Knowledge of identity and access management, messaging, collaboration, and security configurations.

2. Cloud Infrastructure Management

• Advanced experience in AWS (EC2, VPC, RDS, IAM, S3, CloudWatch, Lambda, CloudFormation) or equivalent cloud platforms.

• Experience in cloud resource provisioning, monitoring, security, automation, and cost optimization.

• Knowledge of Infrastructure as Code (IaC) tools such as Terraform and CloudFormation.

3. Server Administration

• Strong experience in Windows Server and/or Linux administration.

• Knowledge of server configuration, maintenance, troubleshooting, system hardening, and performance monitoring.

• Experience with backup management, disaster recovery, and server security.

Additional Qualifications

• Strong understanding of networking concepts, including DNS, VPN, firewalls, and routing.

• Experience with scripting and automation using PowerShell and/or Python.

• Strong understanding of IT security best practices and general IT governance concepts.

• Excellent problem-solving, analytical, communication, and documentation skills.

• Ability to lead technical initiatives and provide mentorship to junior team members.