Hire the Best Mac OSX Administrators
in Germany

Hello! I'm Dimitris — an electrical engineer turned IT specialist who pairs hands-on infrastructure expertise with an engineer's problem-solving mindset. I hold a BSc in Electrical Engineering (Computer Systems) and am completing an MSc in System Informatics & Project Management, backed by 7+ years administering enterprise environments. At the German Cancer Research Center (DKFZ), I led mail-system migrations for 9,000+ accounts (Exchange 2013 → 2019 → Microsoft 365) with zero data loss and minimal downtime, and reduced administrative workload by 30–40% through automation. What I offer: Microsoft 365 & Exchange — migrations, hybrid identity (Entra ID / AAD Connect), Exchange Online administration System administration — Windows Server, VMware ESXi, Linux; provisioning, performance tuning, backup & archiving Networking & troubleshooting — AD, DNS, DHCP, firewalls, switches Automation & monitoring — PowerShell, Bash, Python; monitoring with tools like Icinga2 Project management — Agile & Waterfall delivery, risk management, clear documentation Mentorship & leadership — guiding junior admins and establishing troubleshooting best practices Certified in Azure Fundamentals (AZ-900), Exchange Server & Online Administration (MS-203), Windows Server 2019, and Microsoft 365 Security Essentials. I approach every project the way an engineer does: find the root cause, design a clean solution, and document it so it lasts. Whether you need someone to own a migration end-to-end or strengthen an existing team, I communicate clearly, deliver reliably, and I'm always eager to learn new tools and take on unfamiliar challenges. Ready to help you build secure, scalable, and dependable IT. Let's talk!

Are you looking for a dedicated and versatile developer to drive your technical projects forward? As a newly launched business, I offer support in various areas and bring a wide range of skills that your company can benefit from. I look forward to hearing from you and receiving your inquiry! - iOS Native App Development (Swift) - WebDesign (WordPress, Divi, Elementor) - Administrative Tasks - Customer Technical Support - Linux Support - C Programming (Embedded Systems) - Arduino

Enterprise-level Windows and Linux system administrator, infrastructure engineer, with 20+ years of expertise. Certified MS Teams, CompTIA Linux+ and Azure which I´m specialized in Office 365 services like Exchange, SharePoint OneDrive and in managing Office 365 environment. Veeam Certified Engineer (VMCE) 2023, UniFi Wireless Specialist ✅Here's what I can add to your project: Migrations and Implementations all including onprem/cloud/hybrid profiles -New active directory (AD), domain migration and synchronization, Azure Active Directory (AAD) -New tenants’ setup with exchange, SharePoint and Teams services -Configuration of SSO (single-sign-on) with 3rd party apps ex.: Adobe suite, Personio, TeamViewer -License attribution and cloud costs management. -Tenant to tenant migrations -VPN connection between HQ and branch offices, user VPN connection with 2nd factor authentication enabled, soft token or hard token. -Windows and Linux server Administration ✅And technologies like Hypervisors – Vmware Esxi, vCloud, Hyper-V and Proxmox. Storage - TrueNAS, Dell EMC Data Domain and Dell Equallogic Antivirus - Kaspersky - Microsoft MDATP (defender) Firewall - pfsense Switching – NETGEAR, Dell and Cisco MDM - Endpoint Central (ManageEngine) Identity management – OpenLDAP, ADDS, AAD including SSO + MFA to 3rd party applications. Languages - Ansible /Yaml - Pwsh Cloud – Azure, AWS and GCP Monitoring – Zabbix Backup – Backup Exec, Veeam Experienced in discussing knowledge-based document creation, change management and Disaster Recovery / Business Continuity creation and implementation. Familiar with DevOps practices – Agile infrastructure, CI and CD, also in tools such as JIRA, Confluence, Jenkins and experience in technologies such as Ansible, Docker, IT Helpdesk handling service desk ranging from AD password resets, application issues, software/hardware troubleshooting, mobile device management etc. Technical Knowledge Manager handling business solutions and analysis. Owner of a great sense of urgency, commitment and focus on results reporting them through KPIs. Ability to work with multidisciplinary teams in several countries in a global outsourcing model. ⭐ As an individual, I am extremely adaptable, resourceful, resilient, and genuinely want to overdeliver, to improve my client´s workability. Something else, I have a dedicated course published on Udemy about Linux Essentials to people beginning in Linux world and I´m proud to say that by now more than 5.161 students already made it and my overall rate fluctuate between 4.5 and 4.8 stars. You can check it out here in portfolio. ⭐I do understand that information technology needs to be addressed to boost operational efficiency and meet business outcomes. Thank you for your time and interest in my profile.

I am a professional System Administrator with strong hands-on experience in Linux and Windows server environments, cloud infrastructure, and modern hosting setups. I currently work as an IT System Administrator and manage complete production environments, including Microsoft 365, Linux servers, WordPress hosting, DNS, email infrastructure, and security-critical systems. My focus is always on stability, security, and solutions that work reliably in real-world business environments. What I do best: - Linux server administration (Ubuntu) - Cloud and VPS environments - WordPress hosting and troubleshooting - DNS, SSL, email, and domain configuration - Server security hardening and monitoring - Performance optimization and problem analysis - Ongoing maintenance and on-demand support I work very pragmatically: I analyze problems quickly, explain issues clearly, and fix them without unnecessary complexity. Many of my projects are not one-time tasks but ongoing, as-needed support roles. I strongly believe that servers, email systems, and hosting environments must be maintained continuously to stay secure and performant. That’s why I often work as a long-term technical partner rather than just a short-term contractor. In addition to my client work, I run a technical YouTube channel where I openly share system administration, self-hosting, and infrastructure knowledge: www[DOT]youtube[DOT]com/@thesysadminhub This channel reflects how I work: transparent, practical, and focused on real solutions instead of theory. You can also learn more about my services and background here: www[DOT]thesysadminhub[DOT]com If you are looking for a reliable system administrator who can support your infrastructure on-demand, troubleshoot issues efficiently, and help keep your systems stable and secure over the long term, I would be happy to work with you.

Systems Administrator & Automation Engineer | Linux | Python | Bash | macOS Top Rated freelancer with 10+ years of experience delivering Linux administration, infrastructure automation, scripting, and operational tooling for international clients. Maintained a 5.0/5.0 rating across 49 completed contracts on Upwork. I specialise in Linux server administration, infrastructure automation, and operational tooling for clients who need systems built, maintained, and kept running reliably with minimal oversight. Infrastructure & Systems • Linux administration (Ubuntu, Debian, CentOS) — VPS management, LAMP stacks, SSH, server hardening • macOS administration and automation • Windows 10/11 deployment and technical support • Networking — DNS, DHCP, VPN, TCP/IP, remote access tooling Automation & Scripting • Python, Bash, PHP, AppleScript • Webhook pipelines, REST APIs, web scraping • Telegram/Discord integrations, alerting systems, operational tooling • Cron automation, task scheduling, monitoring workflows Hardware & Deployment • PC/workstation assembly and diagnostics • Multi-GPU system configuration and thermal optimization • Bare-metal imaging, deployment, and hardware troubleshooting I work independently, communicate clearly, and adapt quickly to unfamiliar systems and operational environments. I specialize in solving infrastructure and operational problems pragmatically and reliably.