Cloud Software Group
Cambridge, Cambridgeshire
Senior Software Engineer - XenServer Toolstack About the role This 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. About XenServer 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 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 Preferred qualifications Bachelor's degree or higher in Computer Science or equivalent experience Experience with virtualization, particularly Xen or XenServer Familiarity with large-scale or cloud-native infrastructure Background in agile methodologies like Scrum Why this role matters This is a high-impact engineering role at the core of a widely deployed and mission-critical virtualization platform. The control plane is central to how organizations manage infrastructure, and your contributions will directly shape the experience of customers running healthcare, finance, education, and cloud environments across the globe. This role offers the chance to work on technically rich challenges - from performance tuning and cluster coordination to open API design - while building deep expertise in systems engineering and functional programming. Whether your goal is to lead major features, grow into architectural leadership, or contribute meaningfully to open source, this position gives you the platform to make a lasting impact. About Us: Cloud Software Group is one of the world's largest cloud solution providers, serving more than 100 million users around the globe. When you join Cloud Software Group, you are making a difference for real people, each of whom count on our suite of cloud-based products to get work done - from anywhere. Members of our team will tell you that we value passion for technology and the courage to take risks. Everyone is empowered to learn, dream, and build the future of work. We are on the brink of another Cambrian leap a moment of immense evolution and growth. And we need your expertise and experience to do it. Now is the perfect time to move your skills to the cloud. Cloud Software Group is firmly committed to Equal Employment Opportunity (EEO) and to compliance with all federal, state and local laws that prohibit employment discrimination. All qualified applicants will receive consideration for employment without regard to age, race, color, creed, sex or gender, sexual orientation, gender identity, gender expression, ethnicity, national origin, ancestry, citizenship, religion, genetic carrier status, disability, pregnancy, childbirth or related medical conditions (including lactation status), marital status, military service, protected veteran status, political activity or affiliation, taking or requesting statutorily protected leave and other protected classifications. If you need a reasonable accommodation due to a disability during any part of the application process, please email us at for assistance.
Senior Software Engineer - XenServer Toolstack About the role This 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. About XenServer 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 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 Preferred qualifications Bachelor's degree or higher in Computer Science or equivalent experience Experience with virtualization, particularly Xen or XenServer Familiarity with large-scale or cloud-native infrastructure Background in agile methodologies like Scrum Why this role matters This is a high-impact engineering role at the core of a widely deployed and mission-critical virtualization platform. The control plane is central to how organizations manage infrastructure, and your contributions will directly shape the experience of customers running healthcare, finance, education, and cloud environments across the globe. This role offers the chance to work on technically rich challenges - from performance tuning and cluster coordination to open API design - while building deep expertise in systems engineering and functional programming. Whether your goal is to lead major features, grow into architectural leadership, or contribute meaningfully to open source, this position gives you the platform to make a lasting impact. About Us: Cloud Software Group is one of the world's largest cloud solution providers, serving more than 100 million users around the globe. When you join Cloud Software Group, you are making a difference for real people, each of whom count on our suite of cloud-based products to get work done - from anywhere. Members of our team will tell you that we value passion for technology and the courage to take risks. Everyone is empowered to learn, dream, and build the future of work. We are on the brink of another Cambrian leap a moment of immense evolution and growth. And we need your expertise and experience to do it. Now is the perfect time to move your skills to the cloud. Cloud Software Group is firmly committed to Equal Employment Opportunity (EEO) and to compliance with all federal, state and local laws that prohibit employment discrimination. All qualified applicants will receive consideration for employment without regard to age, race, color, creed, sex or gender, sexual orientation, gender identity, gender expression, ethnicity, national origin, ancestry, citizenship, religion, genetic carrier status, disability, pregnancy, childbirth or related medical conditions (including lactation status), marital status, military service, protected veteran status, political activity or affiliation, taking or requesting statutorily protected leave and other protected classifications. If you need a reasonable accommodation due to a disability during any part of the application process, please email us at for assistance.
Cloud Software Group
Principal Legal Counsel, Employment EMEA U.K. Remote About Our Global Employment Law Team The Cloud Software Group ("CSG") Global Employment Law Team provides mission-critical legal support to HR, the CSG enterprise, and the Company's business units on employment related matters in the U.S., the U.K., and abroad. The team works collaboratively to help the Company achieve its business objectives while mitigating legal risk, exercising sound judgment, and solving problems expeditiously. In addition to addressing CSG's employment law matters, the Global Employment Law Team also manages HR Compliance, acts as the primary point of contact for law enforcement inquiries, and plays a critical role in advising on internal investigations of cyber and facility security issues, as well as the entire range of employee relations and workplace matters. Job Description The person who will fill this role will report directly to the Legal Director of Global Employment and provide legal guidance-often with the advice of local foreign counsel-primarily for CSG's operations and business activities in EMEA in areas including employee relations, compliance, company policy, security, litigation management, benefit and equity incentive plans, and the people-related aspects of M&A transactions. The ideal candidate for this role will have the confidence, experience, and skills to work independently, but also enjoy working collaboratively with a top-notch legal team and the CSG internal clients and stakeholders that the Global Employment Law Team supports. Duties and Responsibilities Provide legal guidance on a broad range of employee relations issues, including employee misconduct, job performance issues, medical leave and disability accommodation compliance, anti-discrimination, anti-harassment and related workplace matters; For reductions in force, help provide guidance on the impact of job elimination on high-risk employees, advise on adverse impact analyses, and work with international counsel on employee selection, proper notice, and severance requirements; Handle the legal side of facility security and cybersecurity investigations; Draft and update restrictive covenant, employment, severance, retention, benefits, equity, and compensation agreements and plan documents; Assist with providing counsel to our Compliance team, drafting and updating corporate policies, and resolving potential compliance issues as they arise; Work with external counsel, both in the U.K. and internationally, to manage employment cases, set litigation strategy, assist with document collection and witness preparation, and actively participate in settlement negotiations; Assist with preparing company position statements in administrative agency actions and to support outside counsel in court litigation; For all CSG mergers, acquisitions, asset purchases and sales, and divestitures: contribute to due diligence and the drafting and negotiation of transaction documents and advise on the human resource impacts of the intended action. Required Qualifications Requisite degree from an accredited U.K. law school and an active member in good standing of the bar; At least 6-8 years of full-time employment law experience, ideally with a combination of in-house and law firm roles; Preferably some experience in the enterprise cloud software technology industry. In addition to base compensation, certain roles are eligible for additional rewards, including an annual bonus or sales incentives depending on the terms of the applicable plan and role as well as individual performance. Benefits may vary depending on the nature of your employment with CSG and the country where you work. This requisition has no specific deadline for completion. About Cloud Software Group: Cloud Software Group, formed by the merger of Citrix and TIBCO, is one of the world's largest cloud solution providers, serving more than 100 million users globally. Joining CSG means making a difference for real people who rely on our suite of cloud-based products. We value diverse experiences, passion for technology, and the courage to take risks. Everyone is empowered to learn, dream, and build the future of work. CSG is committed to Equal Employment Opportunity (EEO) and compliance with all laws prohibiting employment discrimination. All qualified applicants will receive consideration for employment without regard to protected classifications. If you need a reasonable accommodation due to a disability during any part of the application process, please contact us at or email us at for assistance.
Principal Legal Counsel, Employment EMEA U.K. Remote About Our Global Employment Law Team The Cloud Software Group ("CSG") Global Employment Law Team provides mission-critical legal support to HR, the CSG enterprise, and the Company's business units on employment related matters in the U.S., the U.K., and abroad. The team works collaboratively to help the Company achieve its business objectives while mitigating legal risk, exercising sound judgment, and solving problems expeditiously. In addition to addressing CSG's employment law matters, the Global Employment Law Team also manages HR Compliance, acts as the primary point of contact for law enforcement inquiries, and plays a critical role in advising on internal investigations of cyber and facility security issues, as well as the entire range of employee relations and workplace matters. Job Description The person who will fill this role will report directly to the Legal Director of Global Employment and provide legal guidance-often with the advice of local foreign counsel-primarily for CSG's operations and business activities in EMEA in areas including employee relations, compliance, company policy, security, litigation management, benefit and equity incentive plans, and the people-related aspects of M&A transactions. The ideal candidate for this role will have the confidence, experience, and skills to work independently, but also enjoy working collaboratively with a top-notch legal team and the CSG internal clients and stakeholders that the Global Employment Law Team supports. Duties and Responsibilities Provide legal guidance on a broad range of employee relations issues, including employee misconduct, job performance issues, medical leave and disability accommodation compliance, anti-discrimination, anti-harassment and related workplace matters; For reductions in force, help provide guidance on the impact of job elimination on high-risk employees, advise on adverse impact analyses, and work with international counsel on employee selection, proper notice, and severance requirements; Handle the legal side of facility security and cybersecurity investigations; Draft and update restrictive covenant, employment, severance, retention, benefits, equity, and compensation agreements and plan documents; Assist with providing counsel to our Compliance team, drafting and updating corporate policies, and resolving potential compliance issues as they arise; Work with external counsel, both in the U.K. and internationally, to manage employment cases, set litigation strategy, assist with document collection and witness preparation, and actively participate in settlement negotiations; Assist with preparing company position statements in administrative agency actions and to support outside counsel in court litigation; For all CSG mergers, acquisitions, asset purchases and sales, and divestitures: contribute to due diligence and the drafting and negotiation of transaction documents and advise on the human resource impacts of the intended action. Required Qualifications Requisite degree from an accredited U.K. law school and an active member in good standing of the bar; At least 6-8 years of full-time employment law experience, ideally with a combination of in-house and law firm roles; Preferably some experience in the enterprise cloud software technology industry. In addition to base compensation, certain roles are eligible for additional rewards, including an annual bonus or sales incentives depending on the terms of the applicable plan and role as well as individual performance. Benefits may vary depending on the nature of your employment with CSG and the country where you work. This requisition has no specific deadline for completion. About Cloud Software Group: Cloud Software Group, formed by the merger of Citrix and TIBCO, is one of the world's largest cloud solution providers, serving more than 100 million users globally. Joining CSG means making a difference for real people who rely on our suite of cloud-based products. We value diverse experiences, passion for technology, and the courage to take risks. Everyone is empowered to learn, dream, and build the future of work. CSG is committed to Equal Employment Opportunity (EEO) and compliance with all laws prohibiting employment discrimination. All qualified applicants will receive consideration for employment without regard to protected classifications. If you need a reasonable accommodation due to a disability during any part of the application process, please contact us at or email us at for assistance.