People Matter

Sr Principal Engineer, Software



Multiple locations
Posted on Sunday, February 4, 2024

At F5, we strive to bring a better digital world to life. Our teams empower organizations across the globe to create, secure, and run applications that enhance how we experience our evolving digital world. We are passionate about cybersecurity, from protecting consumers from fraud to enabling companies to focus on innovation.

Everything we do centers around people. That means we obsess over how to make the lives of our customers, and their customers, better. And it means we prioritize a diverse F5 community where each individual can thrive.

Position Summary:

Join F5 Inc. as a Principal Engineer / Sr. Principal Engineer (Individual Contributor) taking charge of designing, developing, and implementing complete software components. As a key technical influencer, you will play a pivotal role in setting the company’s technical direction, contributing to major software subsystems, and mentoring other engineers on their technical growth.

Primary Responsibilities:

  • Data Plane Ownership: Take ownership of data plane components and services on F5XC, including proxies and micro-services.

  • Expertise Development: Develop expertise across platform components, actively contributing to the continuous improvement of our technology stack.

  • Collaborative Scope Definition: Regularly assist Architects and Managers in defining project scope and estimating efforts, demonstrating a collaborative approach to project management.

  • Innovative Solutions: Work closely with Architects to devise and develop new solutions, particularly those involving cross-module dependencies.

  • Product Design Detailing: Regularly detail all aspects of product design, ensuring alignment with the technical architectural framework.

  • Performance Optimization: Review product architecture, identifying and addressing performance bottlenecks and other systemic limitations.

  • Cross-Functional Collaboration: Liaise with cross-functional teams to ensure comprehensive project delivery, fostering a collaborative work environment.

  • Mentorship: Act as a mentor for junior team members, promoting their growth and development within the team.

  • Customer Engagement: Engage with customers to address escalations, devise solutions, and collaborate with Product Management to define and deliver product solutions.

  • Business Translation: Translate business requirements into system design strategies, defining high-level functional and physical design elements.

  • Collaborative Leadership: Demonstrate collaboration by promoting others’ ideas, influencing teams, and contributing to overall team success.

  • Integration Opportunities: Identify opportunities for integration, working across teams and organizations to coordinate the re-use of technology and facilitate integration.

Knowledge, Skills, and Abilities:

  • Technical Proficiency: Extremely hands-on, with strong skills in C/C++ and experience in Rust as a bonus. Knowledge of GoLang is a plus.

  • Expertise: Expert knowledge and experience in proxy technologies, Linux systems, and performance engineering.

  • Kubernetes Proficiency: Well-versed in Kubernetes environments, capable of navigating and leveraging their capabilities.

  • Project Leadership: Capable of delivering projects independently when required, with a proven track record of leading complex product technologies from concept through release.

  • Problem-Solving Skills: Exceptional problem-solving and project management skills, thriving in a fast-paced, high-performance environment.

  • Communication Excellence: Demonstrated excellence in written and verbal communication, ensuring effective collaboration and understanding across teams.

  • Respected Leadership: Well-respected by key stakeholders and peers across broader product development organizations.


  • Typically requires a minimum of 15 years of related experience with a Bachelor’s degree; or 12 years and a Master’s degree; or a PhD with 9 years’ experience; or equivalent experience.

  • Excellent organizational agility and communication skills throughout the organization.


  • Freedom and Learning: Enjoy a work environment that encourages freedom, continuous learning, and ownership.

  • Mentorship: Benefit from great mentors with solid backgrounds in various areas, eager to contribute to your professional development.

  • Team Collaboration: Join a great team where you'll feel at home from day one, fostering a positive and supportive workplace culture.

F5 Inc. is an equal opportunity employer and strongly supports diversity in the workplace.

The Job Description is intended to be a general representation of the responsibilities and requirements of the job. However, the description may not be all-inclusive, and responsibilities and requirements are subject to change.

Please note that F5 only contacts candidates through F5 email address (ending with or auto email notification from Yello/Workday (ending with or

Equal Employment Opportunity

It is the policy of F5 to provide equal employment opportunities to all employees and employment applicants without regard to unlawful considerations of race, religion, color, national origin, sex, sexual orientation, gender identity or expression, age, sensory, physical, or mental disability, marital status, veteran or military status, genetic information, or any other classification protected by applicable local, state, or federal laws. This policy applies to all aspects of employment, including, but not limited to, hiring, job assignment, compensation, promotion, benefits, training, discipline, and termination. F5 offers a variety of reasonable accommodations for candidates. Requesting an accommodation is completely voluntary. F5 will assess the need for accommodations in the application process separately from those that may be needed to perform the job. Request by contacting