ABOUT OPTEXITY Optexity is a product-driven research lab building clinical reasoning and computer use models on data no other lab can reach. We deploy directly inside clinics and hospitals — including systems with no APIs, using integration infrastructure we've built and open-sourced — and in return become their preferred partner. That gives us proprietary clinical reasoning trajectories from practicing physicians, and a feedback loop between real patient encounters, our models, and the products built on top of them. We're a small, fast-moving founding team with multiple published papers in NeurIPS, ICML, CVPR etc and background from Apple, Amazon, Microsoft, CMU, IIT. We are backed by world-class investors and leaders like Jeff Dean, Neotribe VC, PearVC, Together Fund and Zapier Fund.   HOW WE WORK * Customer obsession — we start with the customer and work backwards * Intellectual honesty — ideas matter more than titles; we communicate directly and assume good intent, even in disagreement * Bias for action — we build and learn with customers rather than debate in the abstract * Extreme ownership — we own outcomes, not just tasks, and see problems through Why this role exists Most research roles at this stage hand you a dataset everyone already has and ask you to be marginally better than the last person who tried. Here you get data nobody else has — real clinical reasoning trajectories from practicing physicians — and the room to figure out what to do with it. This is a founding research hire: you'll define the agenda as much as execute it, with direct founder access, real compute, and nothing between an idea and an experiment. What you'll do * Work with real, proprietary clinical data from hospital and clinic partners to surface insights that shape model and product direction * Build clinical reasoning models that improve physician and clinic workflows * Design and publish benchmarks that expose where current LLMs fall short on real clinical reasoning * Evaluate computer-use models on real-world tasks * Own the training and evaluation pipeline end to end * Take open-ended problems from question to working model, with minimal predefined structure * Write up findings as technical reports and papers Ideal candidate * Has real research experience — can define a problem, not just execute a known one * Has trained models before (not just fine-tuned APIs) and is fluent in Python * Master's or higher in ML or a related field * Energized by open-ended problems and ambiguity * Wants to publish, not just ship * Takes ownership without needing to be guided * Genuinely wants a startup over big tech — speed and ambiguity as defaults, not exceptions Nice to have * Prior founder or founding-engineer experience * Strong product taste * Worked on healthcare datasets before * Built LLM-powered products before * Ambitions to start your own company someday — we'll support that path What you get * Direct, daily work with the founders, plus exposure to board and investor conversations * Real ownership of technical direction, with scope that grows as the company does * Full compute and data to do the work properly * Competitive salary and meaningful equity * Visa sponsorship available