Founding Machine Learning Engineer

About Novaflow Novaflow is the AI data analyst for biology labs. Analytics is the bottleneck for scientific discovery. Biologists have to outsource analysis to expensive bioinformaticians or core services and wait weeks or months for results. We're solving this by putting analysis directly back into the hands of researchers, allowing them to go from raw data to publication-ready insights and visualizations in days instead of months. We're well-funded, growing extremely fast, and backed by leading investors including Y Combinator and BioRender. About the Role We're hiring a Founding Machine Learning Engineer to build the AI systems that power our platform. The core challenge: take a natural language query from a biologist and turn it into a correct, reliable bioinformatics workflow. That means working with LLMs, building evaluation systems to know when outputs are good (and when they're not), and shipping models that real scientists depend on every day. This is a high-agency, high-ownership role. You'll work directly with the founders and have real say in our AI strategy. Biology background is not required. What matters is that you're a strong ML engineer who ships. This role is in-person at our San Francisco office. The founding team works side by side every day to make fast decisions and ship. What You'll Work On Build and improve the LLM-powered pipelines that turn natural language into bioinformatics workflows Design evaluation pipelines and benchmarks to measure model quality against real scientific expectations Experiment with fine-tuning, RAG, prompt engineering, and different model architectures Deploy and scale models in production on AWS or GCP Make build-vs-buy decisions on AI tooling and infrastructure Work across the team to integrate ML capabilities into the product Requirements Bachelor's or Master's in Computer Science, Machine Learning, AI, or a related field (PhD is a plus) 2+ years building and deploying ML models in production Strong Python skills and hands-on experience with PyTorch, TensorFlow, or similar Real experience with LLMs: fine-tuning, RAG, prompt engineering, evals Experience working with large datasets and building data pipelines Familiar with AWS or GCP for model training and deployment Docker and CI/CD experience for ML workflows Can spot when an LLM is confidently wrong Nice to Have Experience applying ML to scientific or biological data Familiarity with Anthropic, OpenAI, or other LLM APIs and agent frameworks Terraform and Kubernetes experience Startup background or experience in research-oriented engineering Previous startup experience (prior experience either working for or founding a startup) Why Join Us? Competitive salary and meaningful equity as a founding team member 401(k) with company match Unlimited PTO + federal holidays Monthly health and wellness stipend Meals covered when you're in the office (lunch daily, dinner when you're working late) Team offsites and company events If you're curious about being a founder one day, this is your front-row seat. You'll work side by side with the founders and have full visibility into product strategy, customer conversations, and fundraising as we scale.