Security Engineer | Stability AI Global Negotiation Guide
Negotiation DNA: Startup Comp with UK Base + Pre-IPO Equity | $1B+ Valuation | London HQ | Open-Source AI Security
| Region | Base Salary | Equity (Pre-IPO/4yr) | Bonus | Total Comp |
|---|---|---|---|---|
| London | £85K-£135K | £55K-£185K | — | £99K-£181K |
| San Francisco | $158K-$215K | $60K-$195K | — | $173K-$264K |
| Remote US | $142K-$194K | $54K-$176K | — | $156K-$238K |
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Get My Playbook — $39 →Negotiation DNA Security Engineers at Stability AI face unique challenges in the open-source AI space — securing model releases against adversarial attacks, protecting training data and infrastructure, implementing content safety systems for generated outputs, managing security for publicly available models, and ensuring enterprise-grade compliance for commercial customers. Open-source model releases create a unique threat surface: the models themselves are public, requiring security approaches fundamentally different from closed-source AI companies.
Level Mapping: Stability AI Security Engineer = Google L4 Security Engineer = UK Senior Security Engineer
The UK Market Context Security engineers with AI expertise are in extreme demand in London. Use this scarcity.
Global Levers
- Open-Source AI Security Expertise: "Securing open-source AI models is a unique discipline — the threat models are fundamentally different from closed-source. That specialized expertise: £130K base and £180K equity/4yr."
- Enterprise Compliance Enablement: "Enterprise customers require robust security for commercial API access. My work enables enterprise revenue: £125K base."
- UK Security Market: "AI security engineers in London earn £110K+. Stability: £130K base."
- US Remote: "For US-remote: $210K base and $190K equity/4yr."
Negotiate Up Strategy: "I'm a security engineer with AI model security and content safety expertise. Holding Google London Security at £110K / £180K RSU. For London: £130K base and £175K equity/4yr. US-remote: $210K base and $190K equity/4yr. Floor for London: £110K."
Evidence & Sources
- Levels.fyi UK security engineer compensation at AI companies (2025-2026)
- Glassdoor Stability AI salary reports
- Blind verified London security engineer offers (2025-2026)
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