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Trajectory raises $45 million in Series A at a $300 million valuation to post-train models without being an engineer

Trajectory, a startup of about 18 people founded about a year ago by three Stanford classmates with stints at Google DeepMind and Apple (Ronak Malde, Michael Elabd and Arjun Karanam), announced a $45 million Series A at a $300 million valuation, led by Sequoia, with Nvidia, Bessemer Venture Partners and Bain Capital Ventures. The platform connects open-source models to the customer's applications, collects feedback and retrains (continual learning / post-training) for specialized tasks — which Malde compares to turning a “smart PhD on day one” into someone with “30 years on the job.” Customers cited include Harvey, Rogo, Decagon, Mercor and Nvidia itself. The post-training platform is becoming publicly available.