harmonic-security-inc - Staff Security Engineer, Product
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Requirements
• Demonstrable software engineering experience in programming, application design and SLDC. • Proven experience as a Product or Application Security Engineer in a modern engineering environment - you understand how products are built and shipped. • Curiosity for emerging threats, especially around AI and ML systems, and a drive to keep our defences one step ahead. • Excellent communicator who can translate between engineering, security, and go-to-market teams - clear, direct, and grounded in technical reality. • Hands-on experience with structured threat modelling, including both security and privacy threat modelling methodologies (e.g. STRIDE, LINDDUN). • Strong Claude Code or equivalent AI coding agent experience. Demonstrated use of agentic AI to build, automate, and accelerate security engineering work. This is a must-have. • YOU MIGHT BE A FIT IF YOU • Like working closely with engineering teams to embed security into everyday development without slowing them down. • Enjoy building and tuning security tools, pipelines, and dashboards that give developers useful signal - not noise. • Can translate complex security risks into clear, actionable guidance for engineers and product teams. • Want to shape how secure development happens in a high-growth, modern engineering organisation. • Reach for Claude Code as a first instinct when building or automating something, and want to apply that to building a product security function that punches well above its weight • WHAT SUCCESS LOOKS LIKE (6-12 MONTHS) • You'll have fine-tuned our default code security rules and enhanced how engineering teams engage with security scans. A measurable outcome is a significant reduction in raw security findings and a streamlined reporting process that meets engineers where they work. • You'll have established a consistent and proportional approach to security in design reviews inc threat modelling, making these practices a routine part of engineering. • You will have introduced automation into our product security workflows, reducing manual effort and allowing the team to focus on more strategic initiatives. • Most importantly, you'll have introduced a top-tier AI development security programme to ensure our AI systems are safe, secure, and regularly reviewed as the tech landscape evolves.
Responsibilities
• Act as the security partner to engineering - helping teams design, build, and ship securely without slowing down development. • Drive and maintain the tooling that underpins product security - from code scanning and vulnerability detection to CI/CD hardening and reporting. • Keep a close eye on our own AI systems and tools - monitoring emerging threats and ensuring our AI security posture evolves with the field. • Lead threat modelling across the product - running structured STRIDE and LINDDUN assessments on new features and system designs, building repeatable templates, and using AI tooling to make it faster and more scalable. The goal is making threat modelling a normal part of how we build, not a separate event. • Use AI to build and scale the product security function - integrating tools like Claude Code into security workflows, from automated threat modelling to building internal security tooling. A high-performing programme, not necessarily a large one.
Benefits
• This isn’t just a job; it’s an opportunity to be part of a team that is redefining cybersecurity. We believe today’s talent is tomorrow’s success, and we’re committed to creating an environment where you can do the best work of your life. • Competitive pay and meaningful equity with a direct stake in Harmonic’s success • Comprehensive benefits, pension plan, generous PTO, and flexible hybrid work • A small, passionate team that values transparency, creativity, and learning • Thoughtful leadership that cares deeply about growth, impact, and people • Annual global off-sites (past trips include Lisbon and Nashville) • The chance to directly shape both our product and our culture as we build a category-defining company • HARMONIC'S CORE VALUES • 🌱 FLOURISH IN THE UNKNOWN • We embrace new, unfamiliar situations that require initiative and rapid decision-making. We orient ourselves quickly and deliver results with minimal guidance. • We raise our hands, take on challenges, and assist others whenever possible. We hunger for opportunities to learn and do more. • 🤝 PERFECT HARMONY • We support one another to create cohesion and unity. We collaborate openly, share feedback honestly, and help everyone produce their best work.
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