> ## Documentation Index > Fetch the complete documentation index at: https://handbook.polar.sh/llms.txt > Use this file to discover all available pages before exploring further. # 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 Further investigations and discoveries regarding worker OOM **Author:** François Voron • **Published:** 2025-12-01 ## All Posts * [Investigating Worker Memory Leak in Polar](/engineering/tech-notes/worker-memory-leak) - A deep dive into debugging memory leaks in our Python worker system using Dramatiq and Redis (*Petru Rares Sincraian*, 2025-08-29) *** ## Post-mortems * [2026-06-12](/engineering/tech-notes/postmortems/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. *** ## 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 Want to contribute? Check out our [engineering guidelines](/engineering/introduction) and reach out to the engineering team.