# Tag

Code Snippets

7 essays

Learning PathJun 26, 2026

The Reluctant 'Handbook' to the Managed Configuration Processor (MCP)

After surviving another config cascade, someone asked for an MCP handbook. Fine. Here's a 'guide' to the Managed Configuration Processor: what it pretends to be, how to poke it, and why it'll still eat your weekend.

Youssef El Hejjioui·5 min
Learning PathJun 25, 2026

The Outbox Pattern: When 'Commit and Publish' Just Isn't Cutting It Anymore

We've all been there: a critical business event vanishing between a database commit and a message broker publish. The outbox pattern, born from distributed system pain, ensures your microservices don't lie about their state.

Youssef El Hejjioui·8 min
career pathJun 25, 2026

Cache Stampede: The Thundering Herd at 3 AM

Remember that sickening feeling when your database lights up like a Christmas tree, not from new traffic, but from expired cache keys? Yeah, that's the cache stampede. Let's talk about surviving it without losing more sleep.

Youssef El Hejjioui·5 min
Code SnippetsJun 18, 2026

Surviving the Microsecond War: Inside High-Frequency Trading Systems

Peeling back the layers of high-frequency trading applications isn't about fancy UIs or abstract cloud principles. It's about brutal optimization, network physics, and debugging systems where milliseconds cost millions. This is how the real game is played.

Youssef El Hejjioui·8 min
Code SnippetsJun 17, 2026

When 'Just Add Threads' Turns into a 3 AM Pager Duty Nightmare

Peeling back the layers of C++ threads, from CPU context switching to the brutal realities of cache coherency and false sharing that turn textbook concurrency into a production incident.

Youssef El Hejjioui·8 min
Code SnippetsMay 16, 2026

PostgreSQL Peer Authentication Failed Fix

Learn how to install PostgreSQL and fix the “Peer authentication failed for user postgres” error on Linux systems using simple configuration changes and proper user setup.

Youssef El Hejjioui·7 min
Code SnippetsMay 14, 2026

Oracle Free ARM VM Capacity Error Fix

Automatically create Oracle free VMs when regions are saturated. Use GitHub Actions and scheduled retries to keep attempting instance creation until capacity becomes available.

Youssef El Hejjioui·5 min