Every few weeks someone posts the same checklist: as a backend engineer, learn System Design, APIs, Databases, Distributed Systems, Caching, Security, DevOps, Performance, Cloud, Monitoring… and the list is correct but can be confusing without specifying when any of it matters. Lets take one end...

TechnologyDev.to• 13m ago

Make fail2ban report its bans to a community blacklist

Check the auth log on any server with port 22 open and it's always the same story: endless login attempts from IPs that have clearly done this before. fail2ban bans them, the bantime runs out, and that's it. Nothing learned, nothing shared.

TechnologyDev.to• 16m ago

How to Sync Two Browser Tabs with JavaScript

Have you ever opened the same web app in two browser tabs and noticed that they behave like two completely separate applications? Sometimes that's fine. But sometimes you want an action in one tab to be immediately reflected in the others.