Series C · Security Engineer
Series C AI Startup Security Engineer Jobs
There are currently 52 open Security Engineer jobs across 34 Series C AI startups. Every listing links straight to the company's official application page, deduplicated and refreshed daily.
52Open roles
34Companies hiring
Jun 15, 2026Last updated
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Open Security Engineer Roles at Series C AI Startups
| Role | Company | Stage | Location | Posted |
|---|---|---|---|---|
| Senior Product Security Engineer | Mach Industries | Series C | Huntington Beach, CA | Jun 15, 2026 |
| Lead Cloud Security/AppSec Engineer | Flagship Pioneering | Series C | Cambridge, MA USA | Jun 15, 2026 |
| Cloud Security Engineer | Mesh | Series C | Europe | Jun 15, 2026 |
| Senior Security Engineer | Nabla | Series C | Paris office | Jun 15, 2026 |
| Senior Security Engineer | Engine | Series C | US Remote | Jun 12, 2026 |
| Staff Cloud Security Engineer | Engine | Series C | US Remote | Jun 12, 2026 |
| Security Engineer | Fireworks AI | Series C | San Mateo, CA | Jun 12, 2026 |
| Security Engineer | Primer | Series C | Poland | Jun 10, 2026 |
| Principal Security Engineer | Candid Health | Series C | San Francisco (CA), Denver (CO), New York (NY) | Jun 8, 2026 |
| Senior Product Security Engineer | Tines | Series C | United States (Remote) | Jun 5, 2026 |
| Staff Security Engineer | Collective | Series C | San Francisco | Jun 4, 2026 |
| Sr. Embedded Security Engineer | Span | Series C | San Francisco | Jun 3, 2026 |
| Sr. Offensive Security Engineer | Span | Series C | San Francisco | Jun 3, 2026 |
| Enterprise Security Engineer | SendBird | Series C | San Mateo, California, United States | Jun 3, 2026 |
| Cloud Security Engineer | Hex | Series C | SF, NYC, or Remote (US) | May 22, 2026 |
| Technical Customer Success Manager - AppSec / OffSec | Xbow Careers | Series C | Remote South Korea | May 21, 2026 |
| Senior Security Engineer | Mixpanel | Series C | London, UK (Hybrid) | May 20, 2026 |
| Application Security Engineer | Opal Security | Series C | San Francisco | May 20, 2026 |
| Product Security Engineer | Candid Health | Series C | San Francisco (CA), Denver (CO), New York (NY) | May 18, 2026 |
| Security Engineer | Encord | Series C | London | May 12, 2026 |
| Security Engineer | Granola | Series C | London | May 12, 2026 |
| Senior Security Engineer | Range | Series C | McLean, VA | May 11, 2026 |
| Security engineer, application security | Writer | Series C | New York City, NY | May 11, 2026 |
| Security engineer, application security (UK) | Writer | Series C | London, UK | May 11, 2026 |
| Security engineer, detection and response (UK) | Writer | Series C | London, UK | May 11, 2026 |
| Security engineer, detection and response | Writer | Series C | US-Office Hubs | May 11, 2026 |
| Staff Security Engineer, DevSecOps (Corporate Security) | 1Password | Series C | Remote (United States | Canada) | May 2, 2026 |
| Product Security Engineer | WorkOS | Series C | United States & Canada | Apr 23, 2026 |
| Detection & Response, Security Engineer | WorkOS | Series C | United States & Canada | Apr 23, 2026 |
| Infrastructure Security Engineer | Modal | Series C | New York | Apr 21, 2026 |
| Security Engineer | Clay | Series C | New York | Apr 16, 2026 |
| Security Engineer | Mercor | Series C | San Francisco | Apr 16, 2026 |
| Security Engineer, Cloud Infrastructure | Mercor | Series C | San Francisco | Apr 16, 2026 |
| Security Engineer, Automation | Mercor | Series C | San Francisco | Apr 16, 2026 |
| Security Engineer, Application Security | Mercor | Series C | San Francisco | Apr 16, 2026 |
| Security Engineer, Application Security | Mercor | Series C | San Francisco or NYC | Apr 15, 2026 |
| Security Engineer, Cloud Infrastructure | Mercor | Series C | San Francisco or NYC | Apr 15, 2026 |
| Senior Security Engineer, Detection and Response | Cape | Series C | Remote | Apr 6, 2026 |
| Security Engineer, Product Security | Cape | Series C | Remote | Apr 6, 2026 |
| Head of Security Engineering | Candid Health | Series C | San Francisco (CA), Denver (CO), New York (NY) | Apr 1, 2026 |
| Senior Security Engineer | You.com | Series C | San Francisco (Hybrid) | Mar 31, 2026 |
| Staff Security Engineer | Socket | Series C | United States | Mar 24, 2026 |
| Application Security Engineer | Retool | Series C | San Francisco, United States | Mar 21, 2026 |
| Security Engineer | Profound | Series C | New York, New York | Mar 3, 2026 |
| Security Engineer | Candid Health | Series C | New York City | Feb 25, 2026 |
| Security Engineer (Senior) | Candid Health | Series C | San Francisco | Feb 25, 2026 |
| Security Engineer | Stedi | Series C | Remote in the USA | Feb 18, 2026 |
| Sr Product Security Engineer | Remote | Europe | n8n | Series C | Berlin Office | Feb 3, 2026 |
| Security Engineer | Rain | Series C | New York, NY | Jan 15, 2026 |
| Senior Security Engineer, Incident Response | 1Password | Series C | Remote (United States | Canada) | Dec 23, 2025 |
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FAQ
How many Security Engineer jobs are open at Series C AI startups?
There are currently 52 open Security Engineer jobs across 34 Series C AI startups on Fast AI Jobs.
Why filter Security Engineer jobs by funding stage?
Funding stage signals company size, runway, and equity upside. Filtering to Series C startups narrows the list to Security Engineer roles at companies at a comparable point in their growth.
How often is this list updated?
Listings are refreshed daily from official company career pages and deduplicated by posting. Every link points to the original application page.