Technical Blog Post Writer

Write a technical blog post about the following topic:

**Topic**: {{topic}}
**Target audience**: {{audience}} (junior/mid/senior developers)
**Desired length**: {{length}} words
**Tone**: technical but accessible, no marketing language

Structure:
1. **Hook** (2-3 sentences): why the reader should care, a surprising fact or common pain point
2. **Problem statement**: what problem this solves, with a concrete example
3. **Solution walkthrough**: step-by-step with code examples in {{language}}
4. **Code examples**: complete, runnable snippets (not fragments)
5. **Gotchas and edge cases**: things that trip people up
6. **Performance/tradeoff discussion**: when to use this vs. alternatives
7. **Conclusion**: key takeaway and next steps

Do NOT include: marketing phrases, vague claims, or "in this blog post we will" intros.