> Markdown version of [/jobs/ext/2720351-principal-software-engineer-layer-7-security](https://www.wearedevelopers.com/jobs/ext/2720351-principal-software-engineer-layer-7-security). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Software Engineer - Layer 7 Security - **Company:** Palo Alto Networks - **Location:** San Francisco, CA, United States - **Experience:** Expert - **Salary:** $170,000.0 - $277,000.0 - **Contract:** Permanent contract - **Skills:** Application Layers, Cloud Computing, Software Quality, Data Structures, Software Debugging, Distributed Systems, Hypertext Transfer Protocols (HTTP), Python (Programming Language), Network Security, Multiprocessing, Networking Basics, OpenSSL, Performance Tuning, Secure Coding, Service Development Studio, Software Engineering, System Programming, Systems Integration, TCP/IP, Multithreading, Backend, Containerization, Information Technology - **Published:** September 4, 2026 - **Apply:** https://startup.jobs/senior-principal-software-engineer-layer-7-security-paloaltonetworks-com-8588488 ## About the Role * Bachelor's, Master's, or Ph.D. in Computer Science or related technical field, or equivalent practical/military experience * 12+ years of professional software engineering experience, including significant time in senior technical leadership roles * Expert-level proficiency in C and strong proficiency in Go * Extensive experience developing in Unix/Linux environments * Proven experience designing and building large-scale, high-performance distributed systems * Deep expertise in networking fundamentals, including TCP/IP internals and network security technologies * Advanced experience with multi-threaded, multi-process, and multi-core system design * Strong foundation in data structures, algorithms, and systems-level performance optimization * Demonstrated ability to lead architecture and deliver complex, cross-functional initiatives * Strong communication skills with the ability to influence technical and non-technical stakeholders Preferred Qualifications * Experience with cloud platforms, orchestration systems, and containerized deployments * Expertise in TLS/SSL internals, cryptography, and libraries such as OpenSSL * Experience with HTTP protocols and backend service development * Proficiency in Python for tooling, automation, or system integration #LI-SA2 ## Description The 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., * Lead the architecture, design, and development of advanced Layer 7 security capabilities within next-generation firewall platforms * Drive the development of highly scalable, real-time, distributed cloud security systems * Define and implement robust, high-performance, and maintainable system architectures * Set technical direction for critical components, ensuring scalability, reliability, and security * Partner with product management, security research, and platform teams to translate complex requirements into executable designs * Lead end-to-end execution across the software development lifecycle, from concept through deployment and sustainment * Establish and enforce engineering best practices, including code quality, performance optimization, and secure development * Mentor senior and junior engineers, and elevate the technical capabilities of the organization * Identify architectural, tooling, and process gaps and drive improvements at an organizational level * Serve as a technical authority for debugging, performance tuning, and complex system challenges ## Related Videos - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [Robots Run Wild, Massive Crime Data Leak and AI Replaces Models - David Benson](https://www.wearedevelopers.com/videos/1849-robots-run-wild-massive-crime-data-leak-and-ai-replaces-models-david-benson) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Remote Driving on Plant Grounds with State-of-the-Art Cloud Technologies](https://www.wearedevelopers.com/videos/251-remote-driving-on-plant-grounds-with-state-of-the-art-cloud-technologies) - [Post-Quantum Cryptography: Preparing for Q-Day](https://www.wearedevelopers.com/videos/100179-post-quantum-cryptography-preparing-for-q-day) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [7 Important Tips That Every Software Developer Should Know](https://www.wearedevelopers.com/magazine/101-7-important-tips-that-every-software-developer-should-know) - [Best Countries for Software Engineers](https://www.wearedevelopers.com/magazine/267-best-countries-for-software-engineers) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology)