Overview   Susquehanna’s business relies on fast, reliable and secure server infrastructure. As a Windows Server Infrastructure Engineer, you’ll build, maintain and improve the Windows server environment that supports our teams and production systems.   You’ll take ownership of the full server lifecycle, develop automation that makes infrastructure easier to manage, and strengthen monitoring to identify and resolve issues early. Working closely with developers and production engineers, you’ll help deliver resilient systems and smooth production deployments.   In this role, you will:   • Manage the full server lifecycle, from planning and building physical and virtual servers to operating system maintenance, patching and decommissioning. • Diagnose and resolve performance, stability and connectivity issues across the server stack, including CPU and memory constraints, storage faults and system crashes. • Operate and improve our virtual infrastructure, including host and VM provisioning, resource allocation, performance monitoring and configuration consistency. • Develop automation and tooling to make server builds, maintenance and support more efficient and repeatable. • Build and maintain monitoring and dashboards that provide clear visibility into system health and help detect issues early. • Manage our Citrix environment, including application onboarding and ongoing support. • Lead and contribute to projects that improve infrastructure resilience and developer productivity. • Support production launches and work with developers and production engineers to resolve deployment and post-deployment issues.   What you can expect from us   Real Impact: By integrating sophisticated coding techniques with innovative engineering ideas, we design and optimize systems that can process massive amounts of data while still ensuring high performance and stability. You’ll see how your contributions towards developing and supporting leading-edge hardware and software technologies make a firm-wide impact that makes us all smarter, faster, and better.   Collaboration: You will partner closely with our Infrastructure, Project Management and Strategy Developer Teams to deliver and manage scalable and highly performant systems to support trading in the region and globally.   Growth: For many of our roles, we don’t expect you to have prior industry experience in proprietary trading or financial services to succeed at Susquehanna. We’re looking for people who are naturally curious, relentless problem solvers, and have the desire to continuously innovate, learn, and grow.   Benefits: Susquehanna offers a wide array of competitive employee perks & benefits   What we're looking for   • Strong hands-on Windows Server administration experience, including Active Directory, Group Policy, Kerberos authentication, WinRM, scheduled tasks and Windows services. • Strong PowerShell skills, including remoting at scale, error handling, modules, advanced functions and script performance optimisation. • Solid networking knowledge, including TCP/IP, UDP, DNS, VLANs, routing on multihomed servers and multicast fundamentals. • Experience managing virtual infrastructure, including compute resources, networking and monitoring. • Experience administering Citrix Virtual Apps and Desktops, including application onboarding and day-to-day support. • A practical understanding of access control, including NTFS permissions, access auditing and role-based access control (RBAC). • A methodical approach to troubleshooting, with experience using tools such as Sysinternals, Resource Monitor, Wireshark or similar packet capture tools, and crash dump analysis. • Good working knowledge of server hardware, including memory, storage, RAID and drivers, with experience diagnosing hardware faults. • Experience with infrastructure monitoring tools such as Nagios. • Familiarity with CI/CD concepts and deployment tools such as Octopus Deploy, Jenkins and TeamCity. • A degree in a technical discipline or equivalent practical experience.   About Susquehanna   Susquehanna is a global quantitative trading firm founded by a group of friends who share a passion for game theory and probabilistic thinking. We have incorporated this approach into our culture, where you will find relentless problem solvers within each of our core disciplines: Trading, Technology, and Quantitative Research. From offices around the world, our employees collaborate to make optimal decisions and are driven by the desire to achieve winning results together.    What we do   We are experts in trading essentially all listed financial products and asset classes, with a focus on derivatives trading. Through market making and market taking, we handle millions of trading transactions around the world every day, providing liquidity and ensuring competitive prices for buyers and sellers. While our presence in the market is broad, our trading desks are highly specialised, allowing for a deep understanding of unique drivers of each asset class.   Equal Opportunity Statement   We encourage applications from candidates from all backgrounds, and we welcome requests for reasonable adjustments during the recruitment process to ensure that you can best demonstrate your abilities.   If you're a recruiting agency and want to partner with us, please reach out to recruiting@sig.com. Any resume or referral submitted in the absence of a signed agreement will not be eligible for an agency fee.   #LI-Onsite #LI-DN1