Senior Software Engineer

Description:

This Senior Software Engineering position focuses on developing the control plane for XenServer, a commercial virtualization platform built on the open-source Xen hypervisor. The control plane is a critical component that manages virtual machines, storage, and networking across clusters of physical hosts and exposes the public XenServer API. It sits at the heart of the platform, providing a unique opportunity to shape and influence how modern infrastructure is managed at scale.

You’ll work primarily in OCaml, a functional programming language well-suited to building safe and maintainable systems software. The role involves deep technical challenges, such as distributed system orchestration, performance optimization, and robust API design — all within an active open-source and enterprise environment. This is a role for engineers who want to grow their skills while solving problems that matter in the real world.
 

XenServer powers critical infrastructure worldwide — from hospitals and government systems to cloud-scale platforms and high-security environments. It supports thousands of virtual desktops, powers ultra-low-latency network appliances, and runs workloads where performance and reliability are non-negotiable. By contributing to XenServer, you’ll be helping organizations around the world operate with confidence.

What you'll do
 

• Design, implement, test, and maintain the software powering XenServer’s control plane
• Lead the development of cross-team features, collaborating across disciplines and domains
• Participate in the evolution of the XenServer architecture, helping to modernize and scale the platform
• Contribute to open-source projects including Xen, the Linux kernel, and XAPI
• Work closely with product managers, support engineers, and customers to align engineering with real-world needs
• Operate in a self-organizing, agile team that values quality, feedback, and continuous improvement
   

What we’re looking for
 

• Strong software development experience on Unix/Linux systems
• Familiarity with procedural languages (e.g., C, C++, C#, Java) and scripting languages (e.g., Python)
• Interest or experience in functional programming (e.g., OCaml, Haskell, F#, Scala, ML)
• Understanding of software engineering best practices including automated testing, code review, and CI/CD
• A thoughtful approach to building scalable, maintainable, and correct systems