Karolis Vitkus

Azure Disaster Recovery Design and Testing

Thu, 05 Nov 2026 00:00:00 +0000

Reviewed and developed an Azure-based disaster recovery solution for a UK organisation operating critical services across an on-premises environment.

The engagement focused on improving the recoverability of workloads replicated to Microsoft Azure and ensuring that future disaster recovery tests would provide meaningful evidence of service availability, rather than simply confirming that individual virtual machines could be started.

Enterprise Infrastructure Security Hardening

Thu, 05 Nov 2026 00:00:00 +0000

Delivered security remediation and infrastructure hardening across enterprise Windows, Microsoft 365, virtualisation and network environments.

The work addressed security assessment findings while balancing risk reduction against application compatibility, operational impact and service availability.

Multi-site Network Infrastructure Refresh

Thu, 05 Nov 2026 00:00:00 +0000

Planned and delivered infrastructure improvements across multiple business locations. The work included firewall, switching, wireless and site connectivity components.

About

Mon, 01 Jan 0001 00:00:00 +0000

I am a Senior Infrastructure Specialist with more than 10 years of experience delivering and supporting enterprise IT infrastructure.

My experience covers networking, cloud platforms, virtualisation, security, disaster recovery, server infrastructure and end-user computing. I focus on producing secure, supportable and resilient solutions that meet both technical and business requirements.

Areas of focus

Enterprise network infrastructure
Microsoft Azure
Windows Server
VMware virtualisation
Firewalls and secure remote access
Microsoft Entra ID
Disaster recovery and business continuity
Infrastructure automation
Security hardening and vulnerability remediation
Docker and Linux services

I am based in the United Kingdom and work across infrastructure projects, technical remediation and operational support.

Contact

Mon, 01 Jan 0001 00:00:00 +0000

You can contact me regarding infrastructure, cloud, networking and security opportunities.

LinkedIn: View my LinkedIn profile
Location: United Kingdom

Experience

Mon, 01 Jan 0001 00:00:00 +0000

Senior Infrastructure Specialist

I design, implement, troubleshoot and maintain infrastructure across cloud, on-premises and hybrid environments.

My work includes:

Infrastructure design and technical planning
Network and firewall implementation
Microsoft Azure services
Virtualisation and server platforms
Security remediation
Disaster recovery
Backup infrastructure
Technical documentation
Change planning and implementation
Complex incident investigation

Working approach

I place particular importance on:

Understanding business impact
Reducing operational risk
Testing before implementation
Documenting important changes
Defining validation and rollback procedures
Producing supportable long-term solutions

Skills

Mon, 01 Jan 0001 00:00:00 +0000

Cloud and identity

Microsoft Azure
Microsoft Entra ID
Conditional Access
Azure Site Recovery
Azure networking
Identity and access troubleshooting

Networking and security

Fortinet FortiGate
Juniper SRX
Cisco switching
Ubiquiti UniFi
Meraki
IPsec and SSL VPN
Web application firewalls
Network segmentation
Firewall policy design
TLS and certificate management

Microsoft infrastructure

Windows Server
Active Directory
Group Policy
Microsoft Defender
PowerShell
SQL Server
Microsoft 365

Virtualisation and backup

VMware vSphere
VMware ESXi
VMware vCenter
Veeam Backup & Replication
Disaster recovery testing
Recovery planning

Linux and containers

Linux server administration
Docker
Docker Compose
Nginx Proxy Manager
PostgreSQL
Application backup and upgrade planning

Operational practices

Infrastructure change management
Technical documentation
Security remediation
Root cause analysis
Migration planning
Rollback and validation planning