Principal Engineer

About this role

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

Requirements

• 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.

Benefits

Up to 150 000 EUR + Equity

Company sponsored meals

Trips to San Francisco

Fetch breaks with the office dog