Principal Engineer - Product Security (Remote)

Req ID: R30029

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Principal Engineer - Product Security (Remote)

  • London, United Kingdom
  • 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:

Does the opportunity to work on product security across the broad portfolio of Citrix products and cloud services for 100 million users excite you?

You'll be part of a team that ensures our products remain secure and free from vulnerabilities that might affect our customers. Alongside highly experienced UK based security engineering experts you'll play a key role in a range of security activities including architectural and design reviews, secure code reviews, security test automation and penetration testing.

If you have experience in one or more of these areas then we would love you to join our team!

The UK team works closely with Product Security team members across the world. Together we cover the entire portfolio of Citrix products and services. These include:

  • Web applications

  • Mobile applications

  • Windows/Mac/Linux software which integrates deeply into the operating system

  • VPN and network devices

  • Virtualization and Hypervisor

  • Cloud services, using the latest technologies from providers such as Microsoft Azure and Amazon Web Services.

As a security engineer at Citrix you will get wide exposure to groundbreaking and multifaceted technologies, working across the entire software development lifecycle from supporting agile development including systems design and architecture, through to penetration testing and finding vulnerabilities in live systems.

What you will be doing as Security Engineer at Citrix:

  • Architectural and design review using techniques such as threat modelling to identify risks and put in place remediation activities during the early design stages.

  • Secure code review of diverse platforms in a wide variety of programming languages and technologies such as .NET, C, C++, Java, Javascript, and Python.

  • Security automation such as fuzzing, dynamic and static analysis.

  • Penetration testing of Citrix cloud services and Enterprise software solutions.

  • Provide security training and advice to engineering teams on all aspects of security, working with them to review security fixes.

Experience and Qualifications:

We'd like you to have a background in: Penetration testing, secure code review, security automation, cryptography, and architectural design review.

A good knowledge of common software security vulnerabilities and experience of finding them in at least one of the following: Web applications, operating systems, mobile apps, networking, virtualization and cloud.

We believe you'll also have the team and person skills to be able to work and collaborate effectively across the organization including developers, architects, product managers and engineering leadership.

Qualifications (Knowledge, Skills, Abilities)

  • Specialist in at least 3 of these areas in security – System, Web, Network, Mobile, Cloud, Windows, Cryptography

  • Capable of writing exploits for identified vulnerabilities in the area of expertise.

  • Proven understanding of most common software vulnerabilities and standard secure coding practices.

  • Excellent capabilities to identify security vulnerabilities and root cause analysis.

  • Proficiency in a programming language(s) (e.g. C, C++, Python)

  • Proficiency in System Internals (Windows or Unix)

  • Demonstrated understanding of Computer Science fundamentals (OS, Networks).

Functional Area:

Security Engineering

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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