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William Balance

San Francisco

Freelance AI full-stack developer for San Francisco companies

San Francisco: the epicenter of modern AI

SF is where the current AI cycle gets written. OpenAI, Anthropic, xAI, Perplexity, Mistral’s SF office, Meta’s AI labs, Google DeepMind SF, and a growing list of AI-native scale-ups and YC-backed startups sit inside a few square miles. The Bay Area pushes the frontier on models, agents, inference and dev tooling — on a weekly release cadence no other city matches.

For application teams, the Valley is inspiring and brutal in equal parts. Cycles are short, the field is crowded, and the gap between a clever demo and a shipped feature is unforgiving. Freelancers who last here ship, and they treat tokens, latency and evals as first-class concerns.

Known companies and institutions

  • OpenAI, Anthropic and the frontier labs driving the model layer
  • YC, a16z and the VC ecosystem funding the next wave of AI-native products
  • Notion, Figma, Vercel and Cloudflare shipping AI features at scale

Relevant use cases for San Francisco

  • AI product features for venture-backed SaaS moving from demo to revenue
  • Agent workflows, tool use and function calling for vertical SaaS and dev tools
  • Evals, observability and cost control for teams running LLMs at volume
  • Internal AI tooling for ops, growth and data teams at Series A to C startups

Talking about a project

SF runs 16 or 17 hours behind Seoul — ideal for a follow-the-sun rhythm. Book a 30 minute intro via Cal.com or email me directly.

Got a project?

30 free minutes to scope your need and figure out whether I am the right fit.

Nearby cities

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