Principal Engineer

Cognee is building the memory engine + data plane for AI agents to plan, reason, and act. Our open-source Python SDK is in production at 70+ companies , hit GitHub Trending , and runs 550 000 times a month . We’ve won early customers (top 10 Pharma etc) and just raised a large Seed . We’re hiring a Principal Engineer to own the Cognee SDK as a product surface area — setting technical direction, raising engineering quality, and scaling adoption. You'll be coding in Python and Rust. What you’ll own SDK architecture, API design, and roadmap (Python now, future SDKs later) Release engineering: versioning, compatibility, CI/CD, testing, benchmarks Performance, reliability, observability, and production readiness Developer experience: docs, examples, reference implementations Open-source stewardship: contribution workflows, PR reviews, community support Cross-team leadership: shaping core platform contracts through the SDK What we’re looking for Principal-level ownership of a high-adoption SDK / developer platform / core library Deep Python skills (packaging, typing, testing, performance, clean APIs) Experience with production systems Strong taste for DX and high standards for stability and maintainability Bonus: open-source leadership, agent/memory/retrieval systems experience Hands-on experience with LLMs The SDK is how the world experiences Cognee — you’ll define it. Up to 150 000 EUR + Equity Company sponsored meals Trips to San Francisco Fetch breaks with the office dog