Tech Notes

Technical insights, debugging stories, and engineering learnings from the Polar team

Welcome to Polar Tech Notes! Here you’ll find technical deep-dives, debugging stories, and insights from our engineering team.

Latest Post

Worker Memory Leak Act 2

Further investigations and discoveries regarding worker OOM

Author: François Voron • Published: 2025-12-01

All Posts

• Investigating Worker Memory Leak in Polar - A deep dive into debugging memory leaks in our Python worker system using Dramatiq and Redis (Petru Rares Sincraian, 2025-08-29)

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Post-mortems

• 2026-06-12 - An incident report detailing the outage of the Polar platform on June 12, 2026, its impact, root cause analysis, and actions taken to prevent future occurrences.

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About Our Tech Notes

Our tech notes document:

• Technical Investigations: Deep-dives into complex problems and their solutions
• Debugging Stories: Real-world debugging scenarios and methodologies
• Performance Optimizations: How we improve system performance and scalability
• Lessons Learned: Key insights from building and maintaining Polar

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