---
title: "Discussion on \"You Learned the 7 Patterns. The Hard Problems Combine Them.\" | Hashnode"
description: "Discussion on \"You Learned the 7 Patterns. The Hard Problems Combine Them.\". You drilled the 7 patterns. Real interviews stack two at a time. Here's how to see the layers."
url: "https://hashnode.com/posts/you-learned-the-7-patterns-the-hard-problems-combine-them/6a38fc5d93daa5b20660df74"
---

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# [You Learned the 7 Patterns. The Hard Problems Combine Them.](https://alexmateo.hashnode.dev/you-learned-the-7-patterns-the-hard-problems-combine-them?utm_source=hashnode&utm_medium=feed)

You drilled the 7 patterns. Real interviews stack two at a time. Here's how to see the layers.

Jun 22 · 7 min read · alexmateo.hashnode.dev  
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## Written by

[Alex Mateo](https://hashnode.com/@alexmateo)

@alexmateo · Madrid, Spain

  
[View profile](https://hashnode.com/@alexmateo)

Software Engineer from Madrid, Spain. Founder of Expora.

I’m a software engineer who cares less about clever code — and more about systems that keep working when reality changes. Most of my professional work has been in .NET / C#, building and refactoring real production systems: APIs, legacy platforms, data pipelines, and cloud infrastructure.

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