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Series B · Security Engineer

Series B AI Startup Security Engineer Jobs

There are currently 73 open Security Engineer jobs across 56 Series B AI startups. Every listing links straight to the company's official application page, deduplicated and refreshed daily.

73Open roles
56Companies hiring
Oct 30, 2026Last updated
01

Open Security Engineer Roles at Series B AI Startups

RoleCompanyStageLocationPosted
Director, Security EngineeringInstaLILY AISeries BMultiple locationsOct 30, 2026
Cloud Security Engineerincident.ioSeries BLondonOct 29, 2026
Senior Security EngineerLumosSeries BUnited StatesOct 27, 2026
Staff Security EngineerRoxSeries BSan FranciscoOct 27, 2026
Senior Network Security EngineerValar AtomicsSeries BMultiple locationsOct 27, 2026
Security Engineer (Corporate Security), LondonIsomorphic LabsSeries BLondonOct 26, 2026
Sr. Security EngineerIstari DigitalSeries BAnywhere - USOct 26, 2026
Security EngineerCuspAISeries BMultiple locationsOct 23, 2026
Senior Security Engineer - VulnerabilityEndor LabsSeries BMultiple locationsOct 23, 2026
Senior Security Engineer (AI Safety), London, LausanneIsomorphic LabsSeries BMultiple locationsOct 22, 2026
Security EngineerGreptileSeries BSan FranciscoOct 21, 2026
Senior Security EngineerMysten LabsSeries BUSA (Remote)Oct 21, 2026
Staff / Principal Security Engineer, AI Safety and SecurityLila SciencesSeries BMultiple locationsOct 21, 2026
Security EngineerMysten LabsSeries BMultiple locationsOct 20, 2026
Security EngineerGeneral MatterSeries BLos Angeles, CAOct 20, 2026
Summer 2027 Internship - Information Security EngineerGeneral MatterSeries BLos Angeles, CAOct 20, 2026
Staff Product Security EngineerEndor LabsSeries BMultiple locationsOct 19, 2026
Staff Cloud Security EngineerTypefaceSeries BMultiple locationsOct 19, 2026
Staff Product Security EngineerTypefaceSeries BMultiple locationsOct 19, 2026
Senior Security Engineer - Cloud & AI PlatformEmaSeries BIndia - BengaluruOct 15, 2026
Chief Information Security OfficerCampfireSeries BSan FranciscoOct 13, 2026
Senior Security EngineerhyperexponentialSeries BLondon (hybrid)Oct 13, 2026
Security Engineer, Application SecurityQuartermasterSeries BArlington, VAOct 13, 2026
Senior Product Security EngineerEndor LabsSeries BMultiple locationsOct 12, 2026
Security EngineerEvervaultSeries BLondonOct 8, 2026
IT Security EngineerWordsmith AISeries BEdinburghOct 8, 2026
Security Engineer, Detection and ResponseServalSeries BSan FranciscoOct 7, 2026
Security Engineer, CorporateServalSeries BSan FranciscoOct 7, 2026
Platform Security EngineerOmneaSeries BLondonOct 6, 2026
Security Engineer InternTensorWaveSeries BLas Vegas, NevadaOct 5, 2026
Security EngineerAugustusSeries BBerlinOct 1, 2026
Senior Security EngineerNorthwood SpaceSeries BTorrance, CASep 25, 2026
Senior Security Engineer, DeFiMysten LabsSeries BMultiple locationsSep 23, 2026
Security EngineerAssembledSeries BMultiple locationsSep 18, 2026
Staff Security Engineer, Application SecurityFomoSeries BNew York CitySep 16, 2026
Security EngineerMatXSeries BMountain View (HQ) or RemoteSep 16, 2026
Security EngineerMergeSeries BSan Francisco, CASep 9, 2026
Lead Security Engineering & ComplianceMarqVisionSeries BMultiple locationsSep 1, 2026
Application Security EngineerSonarSeries BGenevaSep 1, 2026
Application Security EngineerSonarSeries BAustin, TexasSep 1, 2026
Application Security EngineerVannevar LabsSeries BRemoteSep 1, 2026
Security Engineering LeadAttioSeries BLondonAug 19, 2026
Security Engineering LeadAttioSeries BUnited KingdomAug 19, 2026
Security Engineering LeadAttioSeries BMultiple locationsAug 19, 2026
Security EngineerTownSeries BMultiple locationsAug 19, 2026
Security Engineer - Detection & ResponseLangChainSeries BMultiple locationsAug 17, 2026
Senior Security EngineerAlice & BobSeries BParis & AubervilliersAug 14, 2026
Senior Platform Security EngineerSpadeSeries BRemote (US/Canada)Aug 14, 2026
Staff Security Engineer, WalrusMysten LabsSeries BMultiple locationsAug 13, 2026
Security EngineerLemFiSeries BLondonAug 10, 2026
View all Security Engineer jobs
02

FAQ

How many Security Engineer jobs are open at Series B AI startups?

There are currently 73 open Security Engineer jobs across 56 Series B 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 B 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.