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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.
Job Responsibility:
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
Requirements:
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
Nice to have:
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