Series A Startup Jobs

LlamaIndex provides AI document-processing and knowledge-agent infrastructure, centered on LlamaParse for parsing, extraction, indexing, and retrieval over unstructured enterprise documents.

Mastra is an active AI developer-tooling company building an open-source TypeScript framework and platform for creating, deploying, observing, and improving AI agents.

Latent Labs is an active AI-for-science company building generative models and agentic workflows for programmable biology and drug design.

New York AI research lab building action and world models for virtual and physical environments.

Composio provides AI-agent infrastructure for secure access to and actions across third-party applications.

E2B provides isolated microVM-based cloud infrastructure for AI-agent workloads.

Character.AI is an interactive AI-entertainment platform for creating and conversing with Characters.

Arena is a community-powered AI evaluation platform where people compare frontier-model outputs and vote, generating human-preference data and public leaderboards.

Arcade is an enterprise AI-agent actions runtime for governing, authorizing, executing, and auditing agent tool calls.

Beijing-based AI company that develops large language models and AI-native products, including hosted model APIs and the Baixiaoying assistant.