ArjanCodes
On this channel, I post videos about programming and software design to help you take your coding skills to the next level. I'm an entrepreneur and a university lecturer in computer science, with more than 20 years of experience in software development and design. If you're a software developer and you want to improve your development skills, and learn more about programming in general, make sure to subscribe for helpful videos. I post a video here every Friday. If you have any suggestion for a topic you'd like me to cover, just leave a comment on any of my videos and I'll take it under consideration. Thanks for watching!
Channel created: January 01, 2017
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The Hidden Mechanism Behind Clean Python APIs (Descriptor Deep Dive)
🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I explain what descriptors are, why attribute access in Python sometimes be...
Stop Passing Primitives Everywhere (Use Value Objects)
🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I show how to use the Value Object pattern in Python to model prices, perce...
Stop Mixing FastAPI with Business Logic: Fix It with Ports & Adapters
🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I refactor a FastAPI + SQLAlchemy example into a clean Ports & Adapters (He...
You’ve Been Underusing Dataclasses (These Tricks Are Wild)
🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I show you 7 powerful and lesser-known things you can do with dataclasses i...
Python Properties vs Methods: The Contract You Didn’t Know You Were Making
🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I break down when something in Python should be a property and when it shou...
CQRS in Python: Clean Reads, Clean Writes
💡 Check out MongoDB Atlas: https://www.mongodb.com/atlas. When your FastAPI list endpoint starts pulling full documents just to compute derived fields, it’s usually a sign your read and write mode...
Stop Building Ugly APIs: Use the Fluent Interface Pattern
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I take a small but realistic Python animation API and refactor it step by step into a fluent interf...
10 Python Features You’re Not Using (But Really Should)
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Python has a lot of powerful features hiding in plain sight, and many developers never really use them. In this vi...
This Design Pattern Scares Me To Death
👉 Get real-time, search result data from Google, Youtube and more with SerpApi: https://serpapi.link/arjan-codes-jan-2025. Business rules have a nasty habit of spreading across your codebase: copi...
7 Things You Didn’t Know Dataclasses Could Do
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Dataclasses are often treated as nothing more than a shortcut for generating init methods, but there’s a lot more ...