About the Role Join a well-funded AI and robotics startup tackling some of the hardest open problems in the field. This is a senior individual contributor role for engineers who are obsessed with novel, technically difficult challenges — the kind that don't have existing solutions. You'll work across systems-level infrastructure, real-time AI state management, custom OS development, and UX grounded in human psychology and organisational behaviour. What You'll Do • Design and build custom database and memory systems from scratch. • Implement real-time LLM token state management at large scale. • Develop custom Unix OS distributions tailored for both humans and AI agents. • Rethink UX paradigms using insights from organisational behaviour and human psychology. • Pursue compounding micro-optimisations across the full stack. • Work onsite 5 days a week in San Francisco. What We're Looking For • Required: Deep obsession with novel, overlooked, or technically unsolved problems. • Required: Demonstrated ability to build large, complex, and maintainable systems in roughly one-third the time most engineers consider possible. • Required: Proficiency in one or more of: TypeScript, Rust, Python. • Required: Experience with graph databases, flexible data pipelines, or ontological modelling. • Comfort applying psychology and organisational behaviour insights to product and UX decisions. • Signal of outlier intelligence — top academic background or standout real-world experience (non-traditional backgrounds welcome). Compensation & Benefits • Cash compensation: $200,000 – $400,000 USD annually • Variable equity on top of cash • Visa sponsorship available Location On-site in San Francisco, CA (South Park neighbourhood). This is a fully in-person role — remote work is not available.