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Scaling Modern Software With Design Patterns: From Observer to Proxy

Marko M.6 min readFeb 4, 2026Technology

Marko M.6 min read

Contents:

Recap: Where part 1 left off

1. Observer pattern – Let code react, not poll

Ruby on Rails example – Domain event with subscribers

2. Command pattern – Turn actions into objects

Ruby on Rails example – SendWelcomeEmailCommand

3. Facade pattern – Hide complexity behind a simple API

Ruby on Rails example – PaymentFacade

4. Composite pattern – Work with trees as one

Ruby Example – Nested menu structure

5. Proxy Pattern – Add Behavior Around Access

Ruby example – Caching proxy for an external API

Putting it all together

What’s next in the series

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