Wyatt Marshall

Wyatt Marshall
Occupation	Entrepreneur, software engineer
Known for	Co-founder and CTO of Halluminate

Wyatt Marshall is an American entrepreneur and software engineer who is the co-founder and chief technology officer (CTO) of Halluminate, a company that builds data and reinforcement learning (RL) environments for training computer-use AI agents. The company was part of Y Combinator's Summer 2025 batch and is based in San Francisco, California.

Career

Marshall co-founded Halluminate alongside Jerry Wu. The company develops highly realistic computer and tool-use environments designed to train frontier AI models on economically valuable workflows, with a particular focus on the financial services sector, including investment banking and private equity. The company's mission centers on automating knowledge work through the creation of RL training environments and associated datasets.

Halluminate has released several open-source and public-facing projects, including Westworld, an open-source project hosted on GitHub, and BrowserBench, a benchmarking tool available at browserbench.ai, as well as Web Bench, another evaluation tool. These projects reflect the company's focus on building infrastructure for evaluating and improving AI agents that interact with computer interfaces and web-based tools.

Marshall has discussed the technical challenges of building large language model (LLM) evaluation systems in production environments. He appeared in a conversation hosted by OpenPipe titled "Building LLM Evaluation Systems in Prod," in which he spoke about approaches to evaluating AI systems in real-world settings.

As of early 2026, Halluminate was actively hiring for technical staff positions in San Francisco, offering compensation packages that include salary and equity, and was willing to sponsor work visas for qualified candidates.