Senior Software Engineer | Stability AI Global Negotiation Guide
Negotiation DNA: Startup Comp with UK Base + Pre-IPO Equity | $1B+ Valuation | London HQ | Open-Source Generative AI
| Region | Base Salary | Equity (Pre-IPO/4yr) | Bonus | Total Comp |
|---|---|---|---|---|
| London | £100K-£155K | £80K-£250K | — | £120K-£218K |
| San Francisco | $170K-$235K | $80K-$250K | — | $190K-$298K |
| Remote US | $153K-$212K | $72K-$225K | — | $171K-$268K |
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Get My Playbook — $39 →Negotiation DNA Senior Software Engineers at Stability AI own critical systems end-to-end — the API platform serving enterprise customers, the model hosting infrastructure, developer tools, and the product surfaces that monetize open-source AI. At a company navigating the unique business model of open-source AI, senior SWEs make architectural decisions that balance community accessibility with commercial viability.
Level Mapping: Stability AI Senior SWE = Google L5 = Meta E5 = UK Senior SWE top-tier
The UK Market Context Push for top-of-market London compensation and use US benchmarks as leverage. Senior engineers at London AI companies should earn £120K+ base.
Global Levers
- Architecture Ownership: "As a senior SWE, I'll own critical platform architecture decisions balancing open-source accessibility and commercial viability. That's Staff-level complexity: £150K base and £240K equity/4yr."
- UK AI Market Competition: "DeepMind, Google, and Meta London all compete for senior engineers at £130K+ base. Stability needs to be competitive: £150K base."
- US Remote Premium: "For US-remote, comparable roles pay $220K+ at AI startups. I need $230K base and $245K equity/4yr."
- Open-Source Business Model Expertise: "Building commercially viable products around open-source models requires unique engineering judgment. I bring that expertise: £145K base."
Negotiate Up Strategy: "I'm a senior engineer passionate about open-source AI with experience building platforms at scale. Holding DeepMind London at £130K / £220K RSU. Stability's mission is compelling. For London: £150K base and £240K equity/4yr. For US-remote: $230K base and $240K equity/4yr. Floor for London: £125K."
Evidence & Sources
- Levels.fyi UK senior engineer compensation at AI companies (2025-2026)
- Glassdoor Stability AI salary reports
- Blind verified London senior SWE offer threads (2025-2026)
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