Hanzla

Latest from the Blog

Thoughts, tutorials, and insights on web development.

Security
Security 9 min

Your VoIP Server Won't Get Hacked Overnight. It'll Get Scanned in Minutes.

I put a SIP trunk live at night and woke up unable to make a single call. Nobody hacked me. Here’s what actually happened, how fail2ban saved me, and why it was never the real fix.

Read More
Career
Career 7 min

Vibe Coding Won’t Replace Engineers But It Might Expose Weak Foundations

Vibe coding is being sold as the future of software. Here's why it's a superpower for non-engineers, a trap for students, and why fundamentals still decide who actually makes it.

Read More
AI
AI 4 min

Building Voice AI Agents with Twilio, OpenAI, and FastAPI

Lessons from production: how to architect a real-time voice agent that handles inbound and outbound calls, logs conversations live, and scales reliably.

Read More
Tutorial
Tutorial 2 min

Getting Started with Next.js 14: A Practical Guide

A hands-on walkthrough of the App Router, Server Components, and Partial Prerendering — the features that make Next.js 14 a serious upgrade.

Read More
Design
Design 2 min

Mastering Tailwind CSS: From Basics to Beautiful

Advanced Tailwind techniques to build responsive, maintainable designs faster — without the CSS bloat.

Read More
Backend
Backend 3 min

Building Scalable APIs with Node.js: Lessons from Production

Practical patterns for building Node.js APIs that handle real load — error handling, validation, observability, and the architectural decisions that matter.

Read More

Subscribe to the newsletter

Get an email whenever I publish a new post. No spam, unsubscribe anytime.