Chalk

Chalk is a developer-first platform for building, deploying and monitoring real-time machine learning features in Python. Its products cover a feature store, a federated database engine, model serving on GPUs, sandboxes for running agents, and evaluation and tracing tools.

The website names enterprise and technology companies as customers, including Whatnot, Grindr, Sunrun, Doppel, MoneyLion, Mission Lane and Turo, and states that it offers forward-deployed engineering to support them. The company's stated model is a commercial platform for engineering and data teams; pricing is not described on the pages reviewed.

Chalk was founded in 2022 and is headquartered in San Francisco, with an office in New York listed on its contact page. The website lists 18 open roles, mainly in engineering, forward-deployed engineering and go-to-market, with locations in San Francisco, New York, Tel Aviv, Japan, Singapore, Dublin and London. The site reports a Series A round of $50 million in May 2025 via a press citation.

Product: Python-based feature store and real-time context engine with model serving, GPU compute, agent sandboxes and evaluation tooling.