> Markdown version of [/jobs/ext/3213336-senior-system-administrator](https://www.wearedevelopers.com/jobs/ext/3213336-senior-system-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior System Administrator - **Company:** Social Discovery Group - **Location:** France (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Proxmox, Microsoft Windows, Active Directory, Amazon Web Services, Confluence, JIRA, Microsoft Azure, Bash Shell, Ubuntu (Operating System), CentOS, Cyber Security, Data Centers, Data Stores, Dynamic Host Configuration Protocol, Linux, DevOps, Domain Name System (DNS), VMware ESX Servers, HAProxy, Hyper-V, Python (Programming Language), Kerberos (Protocol), Windows Servers, Virtual Desktops, Citrix Systems, Nginx, Windows Domain, NT LAN Manager, OAuth, Public Key Infrastructure, Windows PowerShell, Red Hat Enterprise Linux, Cloud Services, Ansible, Reverse Proxy, SQL Databases, Virtual Router Redundancy Protocols, Virtualization Technology, VMware Horizon View, Backup and Restore, Transport Layer Security, Load Balancing, Information Technology, Atlassian Tools, Gsuite, Veeam, Terraform, Block Storage, Terminal Servers, Wsus, Legacy Systems, Vmware - **Published:** September 1, 2026 - **Apply:** https://fr.indeed.com/viewjob?jk=4944145ef8c44073 ## About the Role * A Bachelor's degree in Computer Science, IT, or a related field. * Minimum 5 years administering Microsoft and VDI infrastructure. * Hands-on participation in at least one completed Active Directory domain or forest migration, including migrating objects between domains and forests with minimal downtime. * Experience administering VDI or terminal access platforms in production. * Active Directory: multi-domain AD DS - domains, forests, trusts, replication, FSMO, DFS, GPO, delegation, Kerberos/NTLM, auditing, and deploying new DCs. * Domain/forest migration: ADMT / PES, SID History, dependency inventory, phased migration with minimal downtime. * DNS: zones, forwarders, zone transfers, split horizon. * PKI: AD CS - templates, auto-enrolment, revocation, renewal, TLS lifecycle. * VDI: Citrix or an alternative - deployment, golden images, troubleshooting, Windows 11. * Windows RDS: farm build and operation - Connection Broker, RD Gateway, Session Hosts, published apps, CAL, FSLogix, MFA (Duo). * Windows Server: upgrades from end-of-life to 2022/2025, WSUS and patching, file services, backup/restore (Veeam), addressing audit findings. * Linux: Ubuntu, AlmaLinux, CentOS/RHEL - systemd services and packages, users and access, logs, and troubleshooting. * Load balancing: nginx, HAProxy - reverse proxy, publishing, TLS termination, health checks; NLB; keepalived / VRRP. * Virtualization: Hyper-V and VMware ESXi - VMs, host and datastore basics, snapshots. * Google Workspace / GCP: Workspace tenants - domains, groups, SSO/OAuth, domain-wide delegation, admin and billing, GWS backup; GCP projects. * Automation: PowerShell for routine administration; Bash or Python and IaC (Terraform, Ansible) are an advantage. * Strong soft skills: clear communication and collaboration across diverse teams, effective problem-solving, adaptability, critical thinking about legacy dependencies before changing them, attention to detail (planning production changes with a rollback in mind), and customer focus. * Fluent Russian and English language proficiency at B1 (Intermediate) or above for effective written and spoken communication. Nice to have: * VMware Horizon, Azure Virtual Desktop, or Amazon WorkSpaces in addition to Citrix. * AWS, Azure, or GCP experience. * Hyper-V/VMware/Proxmox * SAN/iSCSI block storage administration * vSAN or alternative HCI solution * ITIL Foundation or another service management certification. ## Description We are seeking an experienced Senior System Administrator with strong expertise in Microsoft infrastructure - Active Directory, DNS, DHCP, Certificate Authority, and Group Policy - and in VDI and RDS access platforms. This is a hands-on role in a team that supports five data centers, several virtualization platforms, storage systems, the corporate Microsoft infrastructure, the VDI farm, backup systems, and cloud services. You will work closely with the NOC, InfoSec, DevOps, and L2 Support teams., * Day-to-day administration of the corporate Microsoft infrastructure - Active Directory, DNS, DHCP, Certificate Authority (PKI), and Group Policy. * Administering the access platforms and the services running on them: Atlassian (Jira, Confluence), the 1C/ERP application and SQL servers, monitoring, backup, Google Workspace, and Slack. * Supporting the VDI and terminal server farms, administering domain services and certificates, and keeping systems patched and documented. * Resolving incidents and service requests within the agreed service levels (SLAs). * Taking part in current infrastructure projects: migration of the Active Directory domain to a new domain; replacement of the Citrix VDI farm with an alternative (cloud or on-prem) solution; replacement of the application publishing and load-balancing stack (nginx, HAProxy, keepalived/VRRP); upgrade of end-of-life Windows servers; and decommissioning of legacy systems. * Preparing implementation steps, building test environments, and running pilots for these projects. * Keeping infrastructure documentation and inventory up to date (NetBox, Confluence). * Participating in the on-call rotation to keep systems available and running. ## Related Videos - [GitOps for the people](https://www.wearedevelopers.com/videos/461-gitops-for-the-people) - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Improving quality with Agentic AI with Rovo Dev and Xray](https://www.wearedevelopers.com/videos/2005-improving-quality-with-agentic-ai-with-rovo-dev-and-xray) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [My journey into DevOps world - How it all started!](https://www.wearedevelopers.com/videos/545-my-journey-into-devops-world-how-it-all-started) - [Collaboration Quantified: Lessons from Open Source Developer Networks](https://www.wearedevelopers.com/videos/1422-collaboration-quantified-lessons-from-open-source-developer-networks) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Mastering Remote Work: Tips for Developers](https://www.wearedevelopers.com/magazine/558-mastering-remote-work-tips-for-developers)