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.

Base pay range

Up to €150 000 + equity, based on skills and experience.

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

• 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 developer experience 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 + equity
• Company‐sponsored meals
• Trips to San Francisco
• Fetch breaks with the office dog

Job Details

• Seniority level: Mid‐Senior level
• Employment type: Full‐time
• Job function: Other
• Industries: IT Services and IT Consulting
• Location: Berlin, Germany