Harmonic Security lets teams adopt AI tools safely by protecting sensitive data in real time with minimal effort. It gives enterprises full control and stops leaks so that their teams can innovate confidently.
We are led by cybersecurity experts and backed by top investors including N47, Ten Eleven Ventures, and In-Q-Tel.
As AI adoption accelerates inside the enterprise, Harmonicâs ability to safely observe, control, and enforce policy at the endpoint is mission-critical.
This role sits at the core of that challenge. As an endpoint engineer, youâll help build and evolve the low-level, security-critical client software that powers Harmonicâs platform. Our software must be fast, resilient, and trustworthy across operating systems and real-world conditions. Youâll have the opportunity to shape foundational agent architecture, influence how we collect and process signals on-device, and set the technical bar for correctness and safety as we define a new category of AI security.
How We Work: AI-First by Design
Harmonic exists to help enterprises adopt AI safely and at scale. We hold ourselves to the same standard. Everyone at Harmonic actively uses AI tools to do their best work, from research and writing to building processes and automating workflows. We expect every new hire to bring curiosity about AI and a willingness to use it to work smarter, faster, and more creatively. For some roles, that means tinkering and staying open to new tools. For others, it means building entirely new systems with AI at the core. We'll be clear about what we expect for each role, and we'll give you the tools and support to get there.
Our Product Delivery team is the engine that turns vision into impact. We ship early and often, getting valuable features into the hands of customers quickly and iterating from there. We work in the open by default, sharing progress and ideas, and we trust each other to own outcomes. Weâre a small but mighty crew where every person plays a critical role and weâre committed to using AI to work smarter and faster
Weâre looking for a hands-on systems engineer with deep expertise in Rust (or C++ with a strong willingness to learn and embrace Rust as your primary language) to help us build and evolve security critical client software. You will work on low level security agents and cross platform components that run on user devices, with a strong emphasis on robustness, performance and security. Your work will power core functionality in how we collect signals, and manage on-device controls for app usage and data movement.
You will join a fast-moving team that ships frequently and cares about correctness, observability and maintainability.
Design, implement, and optimise endpoint security agent components in Rust, targeting desktop and/or server platforms (Windows, macOS, Linux)
Build robust tests, validation tooling and deployment mechanisms for client facing releases that impact our customers in their everyday work
Conduct exploratory technical research to understand the art of the possible and how to best approach implementation of new product features
Investigate and resolve platform specific issues with precision and speed
Work closely with security engineers, backend engineers, and product stakeholders to shape technical requirements
Youâve shipped production Rust or C++ code that runs safely and efficiently across platforms
Your components are well tested, observable, and resilient to partial failures or bad input
You identify performance or architectural bottlenecks before they reach users
You actively reduce complexity in critical code paths without compromising clarity or functionality
You consistently deliver high-quality changes on a tight feedback loop, including regression-safe updates
Strong hands-on experience with Rust (or C++ with a strong willingness to learn Rust) in production systems
Solid grasp of systems programming concepts: memory safety, lifetimes, threads, channels, error handling, IPC
Familiarity with platform APIs and subsystems on Linux, Windows and macOS
Experience building CI-tested, reproducible builds for native applications
Proficiency with common developer tooling: Git, code review, CI pipelines, structured logging, crash analytics
Networking skills and security fundamentals is a plus
Have a strong development background and a rigorous approach to testing and validation.
Relish the prospect of writing code that will run on millions of devices and needs to be reliable and performant around the clock.
Enjoy working close to the OS and care deeply about software performance, correctness, and safety. (Previous Kernel or system-level development experience is a great nice-to-have!)
Can build and ship reliable systems fast, with a sharp eye for edge cases and long-term maintainability.
Learn quickly and independently, maintaining great attention to detail and high standards under pressure.
Have made contributions to open-source Rust (or C++) projects or RFCs.
Believe that good tooling and documentation are essential parts of engineering, not afterthoughts.
Thrive in fast-paced startup environments where ambiguity is the norm.
See AI as a fundamental tool to help you build smarter, faster, and better.
Actively use AI tools (Claude Code, Cursor, or similar) to accelerate your work across the entire lifecycleâfrom writing and debugging to researching and prototyping.
Stay current on how AI is changing the systems engineering domain and have opinions about where it helps and where it doesn't.
Refuse to default to the playbook youâve been running for the last decade, choosing instead to automate the mundane and rethink legacy workflows to focus on high-expertise problems..
This isnât just a job; itâs an opportunity to be part of a team that is redefining cybersecurity. We believe todayâs talent is tomorrowâs success, and weâre 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 Harmonicâs 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 offsites (past trips include Lisbon and Nashville)
The chance to directly shape both our product and our culture as we build a category-defining company
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.
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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