---
title: 'Staff Product Manager at Harmonic Security, Inc'
canonical: 'https://feeny.ai/job/staff-product-manager-harmonic-security-inc-london-6bwsbygh5h1e'
type: 'job'
last_seen: '2026-10-14'
---

# Staff Product Manager at Harmonic Security, Inc

- **Company:** Harmonic Security, Inc
- **Location:** London, United Kingdom
- **Compensation:** £122k–£143k
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-10-03
- **Last confirmed live:** 2026-10-14
- **Apply:** https://jobs.ashbyhq.com/harmonic-security-inc/18044872-d3a0-4b94-8f7a-5680b39ba7f1

## Job description

AI is being run everywhere, by humans and agents. Harmonic Security governs all of it. The AI Governance and Control (AIGC) platform understands user / agent intent and data context in real time, giving security teams visibility and control across every tool and workflow so companies can move faster with AI while minimizing risk. We operate in one of the fastest-moving spaces in tech: the emerging intersection of AI and cybersecurity. It's a market still being defined, and we're among the first to build natively for it - protecting sensitive data in real time, at the endpoint, with minimal friction for the teams using it. Enterprises get full visibility and control. Their people get to innovate without guardrails slowing them down. Named to the Rising in Cyber 2026 list, Harmonic is gaining serious recognition and serious traction. We're led by deep cybersecurity expertise and backed by investors who know the space: N47, Ten Eleven Ventures, and In-Q-Tel. As AI adoption inside the enterprise accelerates, the ability to safely observe, control, and enforce policy in real time isn't a nice-to-have. It's mission-critical infrastructure. That's what we build.

How We Work: AI-First by Design Harmonic exists to help enterprises adopt AI safely and at scale. We hold ourselves to that same standard. Everyone here actively leverages AI tools to perform their best work, from deep research and writing to building robust processes and automating complex workflows. We expect every new hire to bring a genuine curiosity for AI and a commitment to using it to work smarter, faster, and with greater creativity. For some, this involves tinkering and remaining open to emerging tools; for others, it means architecting entirely new systems with AI at the core. We will be transparent about expectations for every role and provide the tools and support needed for you to thrive.

## The Role

We're looking for a Staff Product Manager to take full ownership of a product area focusing on AI Surfaces - the ever-evolving set of places, tools and apps where AI governance has to operate. This is a broad, high-leverage part of what Harmonic builds and sells. You'll be the person who decides which outcomes matter most, in what order we go after them, and be accountable for the value delivered to our customers and our business. This isn't a role where the strategy arrives fully formed and your job is to deliver it. The market we operate in is changing week to week, and often in ways nobody predicted. A large part of this role is forming a view on where it's heading before all of the evidence is conclusive, committing to that view strongly enough that the team can act on it, and adapting your view when things inevitably change.

## What You'll Do

- Owning a product area end to end, from deciding where it should go over the coming year to the detail of what ships next, and being able to explain and defend the reasoning behind both.
- Building and holding a point of view on where your part of the market is going, grounded in what you're hearing from customers, what competitors are doing and how the technology itself is moving.
- Deciding which outcomes in your area deserve investment and in what order, and setting out clearly what success looks like so that we can tell honestly when something is or isn’t working.
- Spending a real share of your time with existing customers and prospects, on sales calls, in proof-of-value engagements, being comfortable leading those conversations with different types of people such as CISOs, CIOs and the people who work for them.
- Collaborating closely across the business, particularly with engineering, design, sales, customer success, so that you can influence decisions well beyond your own team without needing formal authority to do it.
- Getting hands-on at the solution level, whether that means exploring an API, pulling and interrogating data yourself, or testing an idea yourself before committing engineering time to it.
- Raising the bar for how product work gets done here, so that the way you frame problems, write things down and make decisions becomes something other people start borrowing.

## What You'll Bring

- You've owned something substantial before, a product area or a connected set of problems where you set the direction rather than inheriting it. You'll also have strong conviction, because in a market moving this quickly, waiting for certainty often means arriving late. We need someone who is willing to say where they think things are going and stand behind it, while being honest enough with themselves to change course when the evidence tells them otherwise. We would much rather hear a clear view that turns out to be wrong than an overly careful one that rarely commits to anything.
- You're also energised by the reality of a startup, where priorities shift, information is incomplete and a lot of what you'll need doesn't exist yet, which means you'll often be building the product and the way of working around it at the same time. If that sounds like a frustration rather than the appeal, this probably isn't the right role for you.

## Nice to have

- Experience in B2B, particularly selling to and working with large enterprises.
- A background in security, data protection or a related field. This isn't a requirement, because we care far more about how quickly you can get to grips with a domain than whether you already know this one.
- Experience with products that are enabled via an endpoint agent.
- You live and breathe AI trends and latest developments to apply it directly in your role

## Why Join Us

This isn't just a job - it's a chance to help define a category. Harmonic Security was named to the Rising in Cyber 2026 list, and we're just getting started. We're building at the intersection of AI and security, carving out an emerging market where the rules haven't been written yet, and the people who join now will write them. 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.

- Recognized momentum - We made the Rising in Cyber 2026 list, a signal that the market is taking notice
- Rare market opportunity - Join early in a category-defining company at the convergence of AI and security, where your work directly shapes how enterprises tackle one of the biggest unsolved problems in tech
- Competitive pay and meaningful equity - A real stake in Harmonic's success, not a token gesture
- Comprehensive benefits - pension plan and flexible hybrid work
- A small, high-trust team that values transparency, creativity, and continuous learning - no politics, no bureaucracy
- Thoughtful leadership - that cares deeply about your growth, not just your output
- Annual global off-sites - past trips include Lisbon, Portugal and Nashville, TN
- Real ownership - you'll shape the product, the culture, and the direction of the company from day one

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. 🔥 Never Full 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

## About Harmonic Security, Inc

## Company Overview
- **One-liner**: Harmonic Security provides an AI governance and control platform that gives enterprises real-time visibility and inline guardrails across browser, desktop, and AI agent surfaces to enable safe, fast AI adoption.
- **Entity Type**: Private (raised $24.5M total funding across Seed and Series A rounds)
- **Headquarters**: San Francisco, California, United States (with additional offices in London, UK)
- **Founded**: August 2023
- **Founders**: Alastair Paterson (CEO & Co-founder) and Mark Sutton (CTO & Co-founder)

## Core Business
- Primary industry: AI Governance and Security (Technology, Information and Internet)
- Target customers: Enterprise B2B, specifically security teams and IT administrators
- Mission: "To pave the way for secure AI adoption in enterprises, ensuring innovation thrives without compromise"

## Products & Services
- **Harmonic Security Platform**: A unified control plane covering four surfaces (browser extensions, desktop clients, MCP gateway, embedded AI copilots) that reads the intent and context of every AI interaction, applies policies inline in under 200 milliseconds, and coaches users in the moment without disrupting work.
- **MCP Gateway**: Governs agentic workflows at the Model Context Protocol layer, inspecting tool calls, scopes, and destructive actions even when no human is in the loop.
- **Browser Extension + Desktop Client**: Covers 1,000+ AI surfaces including ChatGPT, Claude Desktop, Cursor, Canva, Gamma, Grammarly, Google AI mode, and more. Detects sensitive data and enforces guardrails on end-to-end encrypted traffic that never passes through the corporate proxy.
- **Agent Governance**: Extends policies to autonomous AI agents that act independently, inspecting file reads, API calls, database writes, and email summaries.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Total funding $24.5M; LinkedIn-estimated annual revenue of $1.0M (may be a placeholder)
- **Notable Investors/Partners**: Ten Eleven Ventures (Alex Doll, Founder), René Bonvanie, Grant Whiting, Bryan Woolgar-O'Neil
- **Growth Signals**: 
  - RSA Innovation Sandbox Finalist in 2024
  - Launched MCP Gateway in October 2025
  - Landed Series A funding (July 2024)
  - Headcount of ~55 employees with consistent hiring across SF, London, and remote US
  - SOC 2 and GDPR certified; EU AI Act alignment

## Competitive Advantages
- **Intent-based detection, not keyword/regex**: Policies fire on the intent and context of prompts and agent actions rather than string matching, reducing false positives.
- **Covers the full AI surface**: Browser, desktop, MCP, and embedded copilots — including traffic and agents that network tools cannot see.
- **Inline guardrails in <200ms**: Real-time decisions that coach users or block actions without disrupting workflow.
- **Privacy-by-design**: Employee names can be masked, HR/Finance/Ops/Founders excluded from reporting, and the dataset is sanitized and frozen. Designed to avoid becoming surveillance.
- **Rapid deployment**: Minutes via MDM (Intune, JAMF, Kandji, Group Policy) with no proxy redesign or certificate gymnastics. Full AI inventory available on day one.
- **Agent-ready**: Governs autonomous AI workflows at the MCP and tool call level, not just human prompts.

## Strategic Focus
- Scaling enterprise adoption of AI governance for both human and agentic AI use
- Deepening MCP Gateway capabilities as AI agents become more prevalent
- Growing the platform's coverage to new AI surfaces and expanding data classification
- Maintaining leadership in the emerging AI Security category through continued product innovation and market education

## Why Work Here
- **Culture**: Small, senior team operating in high-trust, high-ownership mode. Real responsibility from day one. Values include "Flourish in the Unknown" (comfort with ambiguity), "Never Full" (hunger to learn and help), and "Perfect Harmony" (collaboration and honest feedback).
- **Work Policy**: Flexible hybrid — 3 days per week in the San Francisco office for US-based roles; London team also hybrid. Remote US roles available.
- **Benefits**: Competitive pay and meaningful equity; health, dental, and vision coverage; 401k matching; flexible time off; 25 days PTO (UK); pension plan matching (UK); Cycle to Work Scheme (UK). Annual global offsites (past locations include Lisbon and Nashville).
- **Engineering Culture**: Substance over hype; psychological safety and mutual respect; decisions made quickly; feedback direct; focus on building for high-stakes environments.
- **Growth**: Shape both the product and the category in a foundational moment for AI governance.

## Sources
1. [harmonic.security](https://www.harmonic.security/)
2. [harmonic.security/company/careers](https://www.harmonic.security/company/careers)
3. [harmonic.security/about](https://www.harmonic.security/about)
4. [linkedin.com/company/harmonic-security](https://www.linkedin.com/company/harmonic-security)
5. [builtin.com/company/harmonic-security](https://builtin.com/company/harmonic-security)

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