Harmonic Security
harmonic.security
Actively hiring
Information Security
AI Governance & Compliance
Cybersecurity AI
Data Loss Prevention
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Overview
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Total raised
$26M
2 rounds on record
Latest round
$17.5M
Series A · Oct 2024 · 2 yr ago
Team
51-200
employees, estimated range
Hiring now
13
+10 posted in 30 days
Backers
2
N47, Storm Ventures
The money's age
Due for its next round
24 months since the last round · and hiring
Momentum
56/100
hiring for its size, a new city, in the news
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Oct 2, 2024
Raised a round Series A $17.5M
Apr 2, 2024
Recognition Harmonic Security Selected as Finalist for RSA Conference 2024 Innovation Sandbox Contest · 01net.it
Oct 19, 2023
Launched Harmonic Security launches to help organizations use generative AI safely · businesswire.com
Sep 13, 2023
Founded per the company register
Sep 8, 2023
Raised a round Venture round $8.5M · SEC Form D
Tractionpublic signals, read monthly
Web presence
top 2%
of 133.2M domains by links, Common Crawl
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Series A | Oct 2024 | $17.5M | — | helpnetsecurity.com |
| Venture round | Sep 2023 | $8.5M | — | SEC Form D |
Registers and programsofficial lists and records that name the company
| Legal entity | HARMONIC SECURITY LIMITED | Companies House |
| Registered | 13 Sep 2023 |
Founders and leadersfrom filings, registers and the company's site
Bryan Woolgar-O'NeilExecutive Officer, DirectorSEC Form D
Alastair PatersonExecutive Officer, DirectorSEC Form D
Backed byfrom the funds' portfolios and accelerator catalogs
N47 
Storm Ventures Investors in similar startupsfunds that back the companies most like this one
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Overview
Harmonic Security prevents employees from pasting sensitive data into public generative artificial intelligence tools. Founded in 2023 in London, it classifies content with its own models rather than brittle regular expression rules. The product gives security teams visibility into which assistants staff actually use.
News
Climb Signs Distribution Agreement with Harmonic Security to Help Secure Mid-Market & Enterprise AI Adoption
EATONTOWN, N.J., Aug. 05, 2026 (GLOBE NEWSWIRE) -- Climb, an international specialty technology distributor and wholly owned subsidiary of Climb...
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Report
ClimbSigns Distribution Agreement with Harmonic Security to Help Secure Mid-Market & Enterprise AI Adoption
EATONTOWN, N.J., Aug. 05, 2026 (GLOBE NEWSWIRE) -- Climb, an international specialty technology distributor and wholly owned subsidiary of Climb Global Solutions, Inc. (NASDAQ: CLMB), today announced a distribution agreement with Harmonic Security, the AI
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Report
Alastair Paterson Is The Co-Founder And CEO Of Harmonic Security.
Companies need to set firmer boundaries between personal and enterprise AI tools, with less crossover between the two.
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Report
Harmonic Security: 22% of All Files and 4.37% of Prompts Submitted to GenAI tools by Employees Contain Sensitive Data
In Q2 alone average enterprise saw 23 new GenAI tools used by employees plus 'hidden' GenAI functions in SaaS applications Organizations are leaking data at a staggering rate according to new analysis
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Report
Harmonic Security Raises $17.5M Series A to Accelerate Zero-Touch Data Protection to Market
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Report
Harmonic Security: $17.5 Million (Series A) Raised To Bring Zero-Touch Data Protection To Enterprises
Harmonic Security announced it has secured $17.5million in Series A funding to bring its uniquezero-touch data protection capabilities to enterprises. Since the company launched in October last year, the total funding has reached over $26 million,with ent
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Report
Harmonic Security raises $17.5M to protect sensitive data from leaking during AI use
Harmonic Security raises $17.5M to protect sensitive data from leaking during AI use - SiliconANGLE
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Report
Harmonic Security Raises $17.5 Million Series A to Accelerate Zero-Touch Data Protection to Market
Harmonic Security today announces it has secured $17.5 Million in Series A funding to bring its unique
Read more
Report
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Tech stack
Technologies named in job postings at Harmonic Security over the last 12 months, by layer, with the share of postings for each.
Technologies in use
38
Postings analysed
17
Stack modernity
84/100AI adopter
Languages
Java35%
Python24%
TypeScript18%
PowerShell12%
Frameworks & libraries
Spring Boot24%
Playwright6%
Selenium6%
Vitest6%
Cloud & platforms
AWS29%
Azure18%
GCP18%
Microsoft Entra ID18%
AI & ML
Claude18%
ChatGPT12%
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Full Harmonic Security tech stack
38 technologies · by team · pay by technology · changes · similar stacks
Salary insights
Compensation ranges based on this company's open jobs
Median
$159k
Typical range
$119k – $210k
Open positions
13
9
Jobs
Middle
33.3%
Senior
33.3%
Staff
11.1%
Architect
22.2%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Middle | 3 | $160k | $160k – $170k |
| Senior | 3 | $152k | $146k – $152k |
| Staff | 1 | $189k | $189k |
| Architect | 2 | $148k | $146k – $150k |
Highest paying role
Deployment Engineer
$210k
Normalized to USD per year
All salaries at Harmonic Security
By role, level and city, against the market · 13 jobs with pay
People
Bryan Woolgar-O'Neil
Executive Officer, Director
Alastair Paterson
Executive Officer, Director
Alexander Doll
Director
T.j. Rylander
Director
Names and roles come from public filings, company registers and the company's own site. Is this you? Correct or remove · How we handle this data
Growth
Hiring Momentum
94/100
Scaling fast
Open positions
13
10 opened / 3 closed in 30 days
Median time-to-fill
15 days
faster than 60% of the market
ATS activity
Every ~4 hours
Today
Hiring Dynamics
+100%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Sales
38% ▲
Backend
13% ▼
Product
13% ▲
AI/ML
6% ▲
DevOps
6% ▲
QA
6% ▲
Actively hiring for Sales (+5 in 30 days)
Activity Timeline
New location: United States
Oct 2026
Added A2A to stack
Oct 2026
Added DLP to stack
Sep 2026
Added LinkedIn to stack
Sep 2026
New location: Chicago
Sep 2026
Added DaVinci Resolve to stack
Sep 2026
Added Adobe After Effects to stack
Sep 2026
Added GitHub to stack
Aug 2026
Added Model Context Protocol to stack
Aug 2026
Added LLM Guardrails to stack
Aug 2026
Added IAM to stack
Aug 2026
Added AI Agents to stack
Aug 2026
Offices
Where the company hires and what each office is for
Cities
2
Hiring now
1
Countries
2
Busiest office
London
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Headquarters
Builds here
Office with open vacancies
No open vacancies right now Tap a pin for the office
London
United Kingdom
HQ
8 open roles 9 posted in 90 days 50% engineering 13% remote 50-200 est. staff $152k Avg Salary
hires for Product, AI/ML, Backend
San Francisco
United States
Regional office
USA, San Francisco
1 posted in 90 days 10-50 est. staff
465 California St, Suite 700, San Francisco, CA 94104
Jobs
$131k – $153k per year • Hybrid • Full-Time • London
Model Context Protocol
AI Agents
A2A
Apply
Apply
Apply
$103k – $120k per year • Hybrid • Full-Time • London
Java
Rust
TypeScript
Model Context Protocol
DevOps
GitLab CI
CI/CD
Git
Linux
Windows
Management
Jira
QA
Selenium
Playwright
Vitest
Apply
$133k – $160k per year • Hybrid • Full-Time • London
Python
Java
TypeScript
Spring Boot
AI/ML
Time Series Forecasting
Human-in-the-Loop
DevOps
AWS
Apply
$131k – $151k per year • Hybrid • Full-Time • London
Python
PowerShell
Copilot
Cursor
Claude
ChatGPT
Perplexity
Apply
$131k – $147k per year • Hybrid • Full-Time • 3+ years exp • London
Java
Maven
Spring Boot
Gradle
DevOps
GCP
Azure
AWS
Cybersecurity
Okta
Microsoft Entra ID
Apply
$131k – $153k per year • Hybrid • Full-Time • 6+ years exp • London
Python
Java
Rust
TypeScript
Copilot
Model Context Protocol
AI Agents
LLM Guardrails
DevOps
Terraform
OpenTofu
AWS
IAM
Cybersecurity
ISO 27001
SOC 2
Threat Modeling
Apply