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I am a seasoned System Administrator with over 14 years of experience in designing, deploying, and maintaining enterprise-grade IT infrastructures. I specialize in building efficient, reliable systems that keep businesses running smoothly Competencies: - Infrastructure Design: Deploying robust Windows & Linux environments - Networking: Advanced configuration of routers, switches, and access points - Virtualization & Containers: Hyper-V, KVM, Proxmox, Docker - Operational Excellence: Automated backups, VoIP, and proactive monitoring systems Certifications: - MCSE (Server Infrastructure) - CCNA (Routing and Switching)

I’m a System Administrator with over 10 years of experience managing IT infrastructure for small and medium-sized businesses. My background covers both Windows and Linux environments, with a strong focus on stability, security, and automation. What I do best: Administration of Windows Server, Exchange, Active Directory, DNS, DHCP Managing virtualization platforms (VMware, Hyper-V, Proxmox) Configuring and supporting Linux servers (Ubuntu, CentOS, Debian) Network management (Cisco, Juniper, Aruba, MikroTik) and VPN setup Automation and scripting with PowerShell, Bash, and Python Backup and monitoring systems (Veeam, Zabbix, Grafana) Hybrid and cloud solutions: Microsoft 365, Azure, Exchange Online Why work with me? I understand how important uptime and security are for businesses I approach every task with reliability and precision I provide clear communication and regular updates If you’re looking for a reliable sysadmin to manage, troubleshoot, or optimize your infrastructure - I’m ready to help.

Platform & DevOps Architect | Kubernetes, GitOps, HA Databases, Cloud Exeprt knowledge and experience: * Kubernetes, Helm; Docker * Terraform * GitOps (ArgoCD, fluxCD) * Cloud solutions (AWS/Azure/GCP) * PostgreSQL ( + Patroni for HA); MySQL/MariaDB (InnoDB cluster/Galera cluster) * Active Directory and Windows infrastructure * Disaster Recovery and High Availability * Production troubleshooting and performance optimization With 20+ years of infrastructure experience, I work on infrastructure design, implementation and maintenance. My areas of expertise: Linux / Platform Engineering: • Production Kubernetes platforms using GitOps (FluxCD, ArgoCD), Helm, and Docker • Web and application stacks: nginx, Apache, PHP, MySQL/MariaDB * DBA: Postresql Patroni, MySQL InnoDB Cluster, Galera Cluster • CI/CD pipelines with GitHub Actions, GitLab CI, Bitbucket Pipelines, and Azure DevOps • Monitoring and observability using Grafana + Prometheus, Zabbix, ELK (+ APM) • Automation and scripting with Bash and Python • Virtualization platforms: VMware, Hyper-V, Xen AWS, GCP, Azure - 10+ years of experience with clouds • Perfect knowledge of SaaS services: EC2, ECR/ECS, VPC, Lambda etc. • Strong architect skills. • aws-cli, cloud, az skills. Windows Infrastructure (20+ years): • Expert in Windows Server 2003–2022, Active Directory, Group Policy, Exchange 2013–2019, and Exchange Online. • Failover Clustering, Network Load Balancing (NLB), MS SQL Server Clusters and AGs.

I am a software reverse engineer: * Are you interested in analysis of software (or device firmware) you don't have source code for? * Don't know how to extract your own data locked in a proprietary data format? * You want interoperability with a proprietary software or online service? * a vendor or supplier locks you to their overpriced closed source solution? * A company is out of business and you need to migrate or to live somehow without official support? Contact me. Requests for reverse engineering of firmwares for any kind of devices and software for all operating systems are welcome. Background: I am an High Performance Computing specialist ( keywords: "super computers" / "number crunching" ) working mostly with huge Linux systems and math related tasks. I am also a scientist specializing in linear algebra. I have somewhat outdated formal training in cryptography (and cryptography related math) but I am definitely not an expert in the field.

I specialize in managing and optimizing Linux-based infrastructures with over 9 years of experience as a System Administrator. My expertise spans cloud platforms like AWS and Azure, alongside extensive knowledge in automation tools such as Ansible and Terraform. I have successfully supported R&D environments, GPU clusters, and have a strong ability to enhance DevOps workflows. I excel in monitoring systems and providing internal IT support, ensuring seamless operations for businesses. If you need a reliable professional to help streamline your IT processes or optimize your cloud solutions, I am here to deliver effective strategies and practical solutions. Let’s discuss your project and how I can contribute to your success.

Experienced full-stack .NET/C# developer with 10 years experience creating complex, reliable and responsive applications in WPF, WinForms, Silverlight, Windows Phone and ASP.NET, including Sql and NoSql backends. I like and know how working in a team, and at all stages of product development. I love when my software solves someone's real problems, brings benefits to people.