Braintrust, a company specializing in AI infrastructure, has secured a $5.1m seed round led by Saam Motamedi from Greylock, bringing their total capital raised to $8.3m. Their product, Braintrust, has emerged as an essential tool for AI development, serving leading technology companies like Zapier, Coda, Airtable, and Instacart. The company has experienced rapid growth within just six weeks, doubling both their team and customer base. This funding will enable them to further accelerate their vision of creating world-class infrastructure for AI products.