Senior IT Systems Administrator

• Hands-on, multi-tasking role covering the full lifecycle of predominantly Windows Server environments: installation, upgrades, configuration, administration, and ongoing maintenance.
• Lead local and remote office projects end-to-end, from initiation through delivery and handover.
• Support and maintain bespoke trading application infrastructure: provisioning, patching, upgrading, and environment management.
• Manage vendors and service providers, coordinating effectively with internal business and technology teams.
• Provide coverage during core hours, with an expectation of additional out-of-hours support as required, including occasional weekend work.
• Business-as-usual (BAU) 3rd line support, with flexibility to deliver 1st and 2nd line support depending on team structure and operational demand.
• Occasional travel to remote office locations may be required.
• 8+ years’ experience in a comparable systems/IT infrastructure role.
• BSc in Computer Engineering (or related discipline) and/or current relevant IT certifications.
• Strong Windows Server administration skills (Windows Server 2016+); Server Core experience is an advantage.
• Strong VMware ESXi and vCenter administration experience (v7.0+), including managing and executing upgrade cycles.
• Hands-on expertise with Veeam backup solutions.
• Solid administration of Active Directory Domain Services, including DNS, DHCP, and Group Policy.
• SQL Server installation, configuration, and administration.
• Experience with Centreon monitoring.
• Strong Citrix experience: XenApp & XenDesktop 7.x, NetScaler ADC, Citrix Studio/Director; Citrix DaaS is a plus.
• Good working knowledge of Exchange Server 2016+, including mailbox administration, retention policies, message troubleshooting, and SMTP relay configuration.
• Experience with NetApp storage (FAS and E-Series), including NFS/CIFS protocols.
• Ability to improve team efficiency by automating repetitive tasks (e.g., PowerShell, Python, Power BI)—a plus.
• Experience managing the Microsoft patching lifecycle, deploying server patches via SCCM; strong SCCM knowledge preferred.
• Broad understanding of global network topology (e.g., DMZ, load balancing, firewalls, VLANs).
• Practical data center experience (hardware racking, cabling/patching, HPE iLO configuration).
• Familiarity with Microsoft 365 services, including Azure AD.
• Nutanix knowledge is advantageous.

Personal Competences

• Strong user/customer focus, committed to delivering a great support experience.
• Highly responsive, energetic, and enthusiastic, with a proactive approach.
• Flexible availability, willing to work extended hours when needed, with a 24/7 support mindset.
• Demonstrates sound judgment and excellent attention to detail.
• Excellent communication skills, both written and verbal, with the ability to engage stakeholders clearly.
• Solutions- and results-driven, able to troubleshoot pragmatically and deliver outcomes.
• Structured, rigorous, and methodical in execution and documentation.
• Comfortable working independently as well as collaboratively within a team.
• A genuine team player with an open, non-political style and high personal integrity.

What We Offer

• A role at the centre of the company business with new challenges daily
• An international company with offices in Singapore, London, Geneva, Houston and the possibility to work abroad
• A flat and approachable organization
• An excellent working atmosphere: Friday drinks and regular office socials
• A competitive compensation and benefits package (bonus, pension & insurance)
• Bespoke in-house training focused on developing skills and substantive knowledge with scope for external training where needed and appropriate