Senior Infrastructure Officer

Tototheo Global is a leading provider of connectivity and technology solutions, enabling maritime, enterprise, and government customers worldwide. Through the integration of satellite communications, digital technologies, and intelligent infrastructure, the company enables reliable, secure, and future-ready operations, helping organisations navigate an increasingly connected world. Our diverse portfolio of solutions includes:

• Integrated Services and Bridge Managed Solutions
• Cybersecurity Solutions
• Connectivity Solutions
• Digital Solutions Job Purpose The Senior Infrastructure Officer is responsible for maintaining, upgrading, securing, and supporting the company’s ICT infrastructure across on-premises, hybrid, and cloud environments. The role ensures that infrastructure systems, cloud platforms, network services, business applications, security solutions, endpoints, and other core IT services operate securely, efficiently, and with minimal downtime. The Senior Infrastructure Officer provides senior-level technical support to internal users, third parties, and clients, takes ownership of complex infrastructure issues, and contributes to the design and delivery of infrastructure projects. The role is expected to proactively identify risks, improve resilience, automate operational processes, and drive continuous improvement across the organization’s IT environment. The successful candidate will work closely with the Head of IT Infrastructure, other members of the IT team, internal departments, external service providers, and technology partners to ensure reliable and secure delivery of IT services. This role requires presence at our Limassol, Cyprus office, or at our Piraeus, Greece office. Remote-only candidates will not be considered. Main Duties and Responsibilities Infrastructure Operations
• Maintain, administer, and support the company’s IT infrastructure across multiple office locations, data centres, and cloud environments.
• Ensure proactive measures are implemented to prevent or mitigate service disruptions and infrastructure-related risks.
• Monitor infrastructure availability, capacity, performance, and security to maintain high levels of service availability.
• Install, upgrade, configure, maintain, and troubleshoot on-premises, hybrid, and cloud-based systems and services.
• Manage servers, virtual machines, storage, operating systems, and associated infrastructure components.
• Manage infrastructure resources, including system configurations, software deployment, patching, antivirus and endpoint protection, and IT assets.
• Perform regular health checks and proactively identify performance, capacity, security, and availability concerns.
• Participate in planned maintenance, system upgrades, migrations, and infrastructure lifecycle activities. Microsoft 365 & Identity
• Administer and support Microsoft 365 services, including Microsoft Entra ID, Exchange Online, SharePoint Online, Microsoft Teams, and related services.
• Manage user identities, groups, permissions, roles, licensing, and access controls.
• Administer and support Multi-Factor Authentication (MFA), Conditional Access, Single Sign-On (SSO), and other identity and access-management controls.
• Support Microsoft 365 security configurations and investigate authentication, access, email-delivery, and service-related issues.
• Support user onboarding, offboarding, and access-management processes in coordination with HR and other departments.
• Conduct and support periodic access and permission reviews. Windows & Linux Infrastructure
• Administer Windows Server environments, including Active Directory, DNS, DHCP, Group Policy, File Services, and related infrastructure services.
• Support and maintain Linux-based servers and applications.
• Manage system updates, security patches, configuration changes, and operating-system lifecycle activities.
• Troubleshoot operating-system, application, performance, and connectivity issues.
• Support virtualization platforms and associated infrastructure. Network Infrastructure
• Administer and support LAN, WAN, VLAN, Wi-Fi, VPN, firewall, switching, and routing infrastructure.
• Maintain secure connectivity between company offices, cloud environments, remote users, and third-party services.
• Configure and troubleshoot firewall policies, VPN connections, network segmentation, and secure remote-access solutions.
• Monitor network availability and performance and investigate connectivity and security incidents.
• Support internet connectivity, redundancy, and failover solutions across company locations.
• Work with ISPs, vendors, and service providers to troubleshoot and resolve network-related issues.
• Maintain accurate network documentation and infrastructure diagrams. Cloud Infrastructure
• Administer and support infrastructure hosted within public cloud environments, including AWS, Microsoft Azure, and other cloud platforms used by the organization.
• Manage cloud servers, virtual machines, storage, networking, security groups, permissions, and related infrastructure services.
• Monitor cloud resources for availability, performance, security, capacity, and cost efficiency.
• Assist with cloud migrations, infrastructure modernization, and service-improvement projects.
• Apply secure access and least-privilege principles to cloud infrastructure.
• Support backup, logging, monitoring, and security services within cloud environments. Endpoint Management
• Administer endpoint and device-management platforms for corporate workstations, laptops, mobile devices, and other managed endpoints.
• Manage device configuration, software deployment, security policies, operating-system updates, and patching.
• Monitor endpoint compliance, health, security status, and software inventory.
• Administer Remote Monitoring and Management (RMM) and remote-support platforms.
• Investigate and resolve escalated endpoint issues that require senior infrastructure-level support.
• Support implementation and improvement of endpoint security and device-management policies. Backup, Disaster Recovery & Business Continuity
• Manage and monitor backup solutions for servers, cloud infrastructure, applications, and other critical systems.
• Review backup jobs and investigate and resolve backup failures.
• Perform and support restoration testing to verify the integrity and recoverability of company data.
• Support disaster-recovery and business-continuity planning and testing.
• Maintain appropriate documentation for backup and recovery procedures.
• Assist in ensuring critical infrastructure and services can be recovered within agreed business requirements. Cybersecurity & Compliance
• Implement and maintain infrastructure security controls, including firewalls, endpoint security, encryption, access controls, monitoring, secure configuration, and backup solutions.
• Support vulnerability identification, assessment, remediation, and infrastructure hardening activities.
• Ensure operating systems, infrastructure components, and applications are appropriately patched and maintained.
• Support implementation and enforcement of least-privilege access principles.
• Assist with security incident investigation, containment, remediation, and post-incident reviews.
• Support periodic reviews of privileged accounts, administrative access, firewall rules, and other infrastructure security controls.
• Support the implementation and maintenance of information-security policies and procedures.
• Contribute to ISO 27001 and other compliance activities by maintaining technical controls, documentation, evidence, and records required for internal and external audits.
• Ensure infrastructure changes are implemented in accordance with established security and change-management procedures. Incident & Problem Management
• Take ownership of escalated infrastructure incidents and service requests from identification thro