Jack & Jill - Systems Engineer (£150k–£195k + Equity) at Harmonic Security Inc.
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Requirements
• Extensive professional experience in Rust or C++ systems programming, focusing on memory safety, concurrency, IPC, and platform-specific APIs. • Proven track record of shipping production-grade security software such as EDR, XDR, or DLP agents across Windows, Linux, and macOS platforms. • Disciplined engineering mindset with a passion for automated testing, observability, and using AI tools to accelerate the software development lifecycle. • Who are Jack & Jill? • Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. • And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. • Step 1. Visit our website https://jackandjill.ai/jobs/systems-engineer-150k-195k-equity-at-harmonic-security-inc-8f962488-89f6-4440-a699-5e6d6d350ca4?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_8f962488-89f6-4440-a699-5e6d6d350ca4. • Step 2. Click 'Talk to Jack'. • Step 3. Talk to Jack so he can understand your experience and ambitions. • Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. • Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. • Step 6. If not, Jack will find you excellent alternatives. All for free. • We never post fake jobs • This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. • We appreciate this can make them look a bit suspect, but there isn't much we can do about it. • Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
Responsibilities
• Design and optimize cross-platform security agent components in Rust to enforce data policy and collect system signals on-device. • Conduct deep technical research into OS subsystems to implement cutting-edge product features and solve platform-specific challenges with precision. • Build robust CI/CD pipelines and validation tooling to ensure stable, reproducible native application releases for global enterprise customers.
Benefits
• Company Description: Harmonic Security Inc. - Series A cybersecurity startup defining AI data protection. • Shape a new category of cybersecurity at a Series A startup backed by $25M from elite investors like Next47, Ten Eleven Ventures, and In-Q-Tel. • Work at the OS level on high-impact software that runs on millions of devices, requiring extreme performance, reliability, and sub-500ms inference speeds. • Join an AI-first engineering culture led by seasoned founders who previously scaled Digital Shadows, offering significant equity and high technical ownership.
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