Senior Principal Software Engineer — Layer 7 Security

Our MissionAt Palo Alto Networks, we’re united by a shared mission—to protect our digital way of life. We thrive at the intersection of innovation and impact, solving real-world problems with cutting-edge technology and bold thinking. Here, everyone has a voice, and every idea counts. If you’re ready to do the most meaningful work of your career alongside people who are just as passionate as you are, you’re in the right place.Who We AreIn order to be the cybersecurity partner of choice, we must trailblaze the path and shape the future of our industry. This is something our employees work at each day and is defined by our values: Disruption, Collaboration, Execution, Integrity, and Inclusion. We weave AI into the fabric of everything we do and use it to augment the impact every individual can have. If you are passionate about solving real-world problems and ideating beside the best and the brightest, we invite you to join us!We believe collaboration thrives in person. That’s why most of our teams work from the office full time, with flexibility when it’s needed. This model supports real-time problem-solving, stronger relationships, and the kind of precision that drives great outcomes.Job SummaryThe TeamEngineering - Our engineering team is at the core of our products and connected directly to the mission of preventing cyberattacks. We are constantly innovating — challenging the way we, and the industry, think about cybersecurity. Our engineers don’t shy away from building products to solve problems no one has pursued before. We define the industry instead of waiting for directions. We need individuals who feel comfortable in ambiguity, excited by the prospect of a challenge, and empowered by the unknown risks facing our everyday lives that are only enabled by a secure digital environment.Job SummaryThe Layer 7 security team is seeking a Senior Principal Software Engineer to lead the design and development of next-generation Layer 7 security capabilities. This is a strategic role responsible for driving innovation in systems that operate at massive scale and protect mission-critical infrastructure worldwide. You will define architecture, influence product direction, and lead the development of security technologies that address sophisticated and evolving threats. This role requires deep expertise in systems programming, networking, and distributed systems, along with a strong track record of delivering high-performance, production-grade software.Key ResponsibilitiesLead the architecture, design, and development of advanced Layer 7 security capabilities within next-generation firewall platformsDrive the development of highly scalable, real-time, distributed cloud security systemsDefine and implement robust, high-performance, and maintainable system architecturesSet technical direction for critical components, ensuring scalability, reliability, and securityPartner with product management, security research, and platform teams to translate complex requirements into executable designsLead end-to-end execution across the software development lifecycle, from concept through deployment and sustainmentEstablish and enforce engineering best practices, including code quality, performance optimization, and secure developmentMentor senior and junior engineers, and elevate the technical capabilities of the organizationIdentify architectural, tooling, and process gaps and drive improvements at an organizational levelServe as a technical authority for debugging, performance tuning, and complex system challengesQualifications Required QualificationsBachelor’s, Master’s, or Ph.D. in Computer Science or related technical field, or equivalent practical/military experience12+ years of professional software engineering experience, including significant time in senior technical leadership rolesExpert-level proficiency in C and strong proficiency in GoExtensive experience developing in Unix/Linux environmentsProven experience designing and building large-scale, high-performance distributed systemsDeep expertise in networking fundamentals, including TCP/IP internals and network security technologiesAdvanced experience with multi-threaded, multi-process, and multi-core system designStrong foundation in data structures, algorithms, and systems-level performance optimizationDemonstrated ability to lead architecture and deliver complex, cross-functional initiativesStrong communication skills with the ability to influence technical and non-technical stakeholdersPreferred QualificationsExperience with cloud platforms, orchestration systems, and containerized deploymentsExpertise in TLS/SSL internals, cryptography, and libraries such as OpenSSLExperience with protocols and backend service developmentProficiency in Python for tooling, automation, or system integration#LI-SA2Compensation DisclosureThe compensation offered for this position will depend on qualifications, experience, and work location. For candidates who receive an offer at the posted level, the starting base salary (for non-sales roles) or base salary + commission target (for sales/com-missioned roles) is expected to be the annual range listed below. The offered compensation may also include restricted stock units and a bonus. A description of our employee benefits may be found here.$170,000.00 - $277,000.00/yrOur Commitment We’re trailblazers that dream big, take risks, and challenge cybersecurity’s status quo. It’s simple: we can’t accomplish our mission without diverse teams innovating, together.We are committed to providing reasonable accommodations for all qualified individuals with a disability. If you require assistance or accommodation due to a disability or special need, please contact us at View email address on click.appcast.io Alto Networks is an equal opportunity employer. We celebrate diversity in our workplace, and all qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or other legally protected characteristics.All your information will be kept confidential according to EEO guidelines.Is role eligible for Immigration Sponsorship?: YesSummaryLocation: Santa Clara, United States of America; San Francisco, United States of America; San Jose, United States of AmericaType: Full time