Job Description

Are you an experienced systems software engineer with an interest in Open Source, with experience working at kernel or operating-system level?

We'd love you to become part of a high-profile team within our R&D Centre in the UK, working on the future development and evolution of the XenServer hypervisor - a leading virtualisation management platform. You and your team will lead on optimizing the platform for Citrix CVAD App & Desktop usage, and Server Virtualisation infrastructures. You'll see your work support the XenServer product and the Open Source Xen project community.

We'd think you'll...

Have some experience in an engineering role where you've developed strong C programming skills and ideally worked on hypervisor/ virtualisation projects. Understand or have some familiarity with x86 assembly language. Have some knowledge of Intel and/or AMD processor edge cases. Working mainly with C, any experience with Python or Bash would be welcome and you'll be using git and Linux tooling as a regular part of your work.

What we'd like you to work on in this role:

We'll give you the knowledge and support to design and craft new software features for the XenServer OS and hypervisor, using our agile development methodology, and you'll get to interact with customers, partners, other Citrix product groups, and with the open source community. Research and develop new technologies in operating system / Linux kernel. Partner with our customers by developing and testing hotfixes for emerging security issues. Work with teams across the company to ensure our products maintain high quality and security standards.

Qualifications and experience:

Proficient in Linux kernel, at least familiar with one subsystem (CPU scheduling, file system, network, I/O, memory management, etc.). Demonstrated knowledge of operating system internals. Experience working on system software in a large codebase. Experience with software development process including: source control, bug tracking, testing, and design documentation. Demonstrated experience working collaboratively with cross-functional teams.

In addition, experience in any of the following areas would be great!

Virtualisation technology in general, and Xen or XenServer in particular. Software and Hardware Security. Knowledge of Linux kernel internals; bootloaders, UEFI; filesystems, partition tables. Experience with packaging for Linux distributions (e.g. RPM packaging), and with common userspace components (e.g. systemd, rsyslog, openssl). Familiarity with x86 architecture and assembly. Open source development processes, and interaction with open source communities.

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 AskHR@cloud.com for assistance.