About Me

I'm Walid Chebbi, a senior backend software engineer. I build resilient distributed systems and scalable backend infrastructure. My work focuses on solving hard problems in production environments, ensuring reliability, and maintaining performance at scale.

What is The 9th Nine?

This site is a technical resource for mid-to-senior engineers. It discusses the realities of modern backend engineering beyond the "happy path." You won't find basic tutorials here. Instead, expect deep dives into system architecture, production outages, database internals, and the complex trade-offs involved in building high-availability software.

Engineering Philosophy

My approach to software engineering is grounded in pragmatism and systems thinking.

• Trade-offs over tools. There is no silver bullet. Every technology choice comes with a cost, and understanding that cost is more important than chasing the latest hype.
• Reliability is a feature. Systems should be designed to fail gracefully. Uptime isn't an accident; it's an engineering discipline.
• Simplicity wins. Complex problems don't always require complex solutions. The most maintainable code is often the code you didn't write.