Senior Systems Software Engineer

Req ID: R32146

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Senior Systems Software Engineer

  • Remote, Cambridge, United Kingdom
  • Cambridge, Cambridgeshire, United Kingdom
  • Full_time

Citrix builds the secure digital workspace technology that frees 400,000 customers to do their very best work from anywhere. By joining our award-winning workplace, you’ll be included in the globally diverse, collaborative team that values work-life balance. Come see why Fortune named us one of the 100 Best Companies to Work For®. Let’s innovate and grow together!

What we're looking for:

You’re a software engineer with experience of development and optimisation at a system level. We'd like you to join a high profile team working on Citrix Hypervisor which is a leading virtualisation management platform optimised for application, desktop and server virtualisation infrastructures.

Our team is focused on optimising whole-system performance by identifying bottlenecks and developing improvements to overcome them. The development team has a strong research approach, and involves collaborative work with other engineering teams and components (e.g., storage, graphics and data path, Windows virtual machines, Linux operating systems, cloud orchestration, toolstack, and low-level components such as the kernel and the Hypervisor).

Experience in a system performance role is valuable, but not crucial. Other valuable skills include a background in design of experiments, knowledge of statistical methods, and modelling and analysis of complex systems including operating systems and cloud services. Familiarity with operating system programming and/or functional programming is also an asset.

We work in a fast paced multi-technology environment: programming languages currently used include C, Go, Python and OCaml; operating systems include Linux and Windows.


  • Analysis of software internals and behaviour to identify performance problem areas

  • Definition of scales of measure of performance in a sophisticated system

  • Proposing, prototyping and productising software changes to improve system performance

  • Working as part of a self-organising team, and providing daily updates of own work, within an agile framework

Qualifications and Requirements:

You’ll probably have a strong academic background with one or more degrees in computing, software engineering, mathematics or experimental sciences.

You’ll actively contribute to several open source projects (including Xen, Linux Kernel, and Xapi), using our agile development methodology and you’ll get to interact with customers, partners, other Citrix product groups, and with the open source community.

  • A body of experience developing software

  • Unix or Linux experience

  • Ability to learn new areas quickly and work at a detailed level right across the software stack

  • Ability to conduct a research project both on one’s own and within a team

In addition, experience in any of the following areas would be preferred:

  • Server virtualisation in general, and Xen or Citrix Hypervisor in particular

  • Windows Device Driver development

  • Distributed systems

  • Datacentre-sized deployments

  • Cloud infrastructure

  • Enterprise network and storage configuration

  • Linux kernel internals

  • Software profiling and performance analysis

  • Agile development practices

  • Open-source development processes, and interaction with open source communities

  • Interaction with customers

  • Knowledge of different types of programming languages, such as procedural languages (e.g., C, C++, C# or Java); scripting languages (e.g., Python); and functional languages (e.g., OCaml, ML, F# or Haskell).

Functional Area:

Software Development

What you’re looking for:

Everyone is welcome at Citrix. We prioritize diversity, equity, inclusion, and a culture of belonging, and celebrate bringing our courageous, authentic selves to work. We believe this way of working helps us innovate, and it’s just one of the reasons why our employees continuously recognize Citrix as a great place to work.

Citrix helps make work more sustainable to benefit the planet, our business, and our communities. For more than 30 years, we have empowered individuals and organizations to work remotely or work from anywhere, reducing commuting emissions and energy consumption in the process. 

We are the #1 leader in Virtual Client Computing (VCC) and #2 in the Application Delivery Controller (ADC) space, and we have key partnerships with top cloud providers. We’ll give you the tools, learning opportunities, mentorship, and flexibility to achieve your goals. Come see why you belong at Citrix, with our culture supporting purposeful innovation and growth from within. 

The Benefits

We offer a competitive total rewards package* that includes:

  • 18 weeks of paid parental leave
  • Health and wellness benefits
  • Employee assistance program
  • Retirement benefits
  • Time off and absence programs
  • Professional development and mentorship opportunities
  • Paid volunteer time and charitable matching of employee donations
  • Employee resource groups
  • And more!

**Please note that benefits may vary based on location.

Citrix Systems, Inc. is firmly committed to Equal Employment Opportunity (EEO) and to compliance with all federal, state and local laws that prohibit employment discrimination on the basis of age, race, color, gender, sexual orientation, gender identity, ethnicity, national origin, citizenship, religion, genetic carrier status, disability, pregnancy, childbirth or related medical conditions, marital status, protected veteran status and other protected classifications.

Citrix uses applicant information consistent with the Citrix Recruitment Policy Notice at

Citrix welcomes and encourages applications from people with disabilities. Reasonable accommodations are available on request for candidates taking part in all aspects of the selection process. If you are an individual with a disability and require a reasonable accommodation to complete any part of the job application process, please contact us at (877) 924-8749 or email us at for assistance.

At this time, we are requiring personnel entering a Citrix office, traveling for business or attending a Citrix event to be fully vaccinated against COVID-19. If you choose to remain unvaccinated based on a specific medical need or a sincerely held religious belief and need to access our offices, Citrix will work with you to provide you with reasonable accommodation where possible. Learn more about our COVID-19 policies.

By applying, you are giving Citrix consent to be considered for future openings of other roles of similar qualifications.

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