Stainless is a fast-growing tech startup building the future of APIs, with customers including industry leaders like OpenAI, Anthropic, and Cloudflare. They have raised over $35 million from a16z, Sequoia, and founders/C-levels from Stripe, Datadog, Segment, Linear, and more, and have a team of ~60 expecting to double in the next ~9 to 12 months.