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I Hate Long If-Elif Chains: This Design Pattern Solved It Once and For All
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. If your code is littered with endless if-elif chains just to handle different formats, behaviors, or commands, the...
My 4 Favorite Python 3.14 Features
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Python 3.14 is here, and it’s not just about pi. In this video, I’ll walk you through the four features I’m most e...
Anatomy of a Scalable Python Project (FastAPI)
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, we break down the anatomy of a scalable Python project using FastAPI and uv. You’ll learn how to se...
SOLID: Writing Better Python Without Overengineering
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. Are the SOLID principles still relevant when you’re writing Pytho...
The Real Reason the Singleton Pattern Exists
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Singletons are often criticized for introducing global state and making code harder to test—but there’s more to th...
These Patterns Will Change How You Write AI Agent Code in Python
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. If you’re building AI agents in Python and your code is starting ...
Python Has the Best Standard Library Ever: 10 Modules You Need to Know
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Python’s standard library is one of its greatest strengths, but many developers only scratch the surface. In this ...
PydanticAI: the AI Agent Framework Winner
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. Pydantic AI lets you integrate large language models like GPT-5 *...
We need to talk.
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. We all have assumptions that quietly hold us back. I’ve been guilty of this my whole career. In this video, I shar...
How to Write Great Unit Tests in Python
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. Want to learn how to write professional, maintainable unit tests ...
UV Just Got A Serious Upgrade
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I walk you through everything new in uv, including major improvements to performance, dependency ma...
Why Are Not More People Using These Python Libraries?
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Python’s standard library is one of its greatest strengths, but many developers only scratch the surface. In this ...
The Builder Pattern: More Common in Python Than You Think
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I show you the Builder Pattern in Python. It’s a practical and underrated design pattern you’re pro...
Is SaaS Dead? Here's a Senior Engineer's Perspective
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. Is SaaS dead? Some claim AI agents and vibe-coded micro-SaaS will...
I Designed a Python SDK That Relies on… Deep Inheritance?!
Check out https://www.squarespace.com/arjancodes to save 10% off your first purchase of a website or domain using code ARJANCODES. Ever wondered how to build a clean Python SDK without a giant god...
This Is Why Your Python Code Turns Into Spaghetti
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Why do Python projects turn into spaghetti so easily? In this video, I show how using abstraction (with Callable, ...
It Seems I No Longer Use Python’s Dataclasses
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I take a deep dive into Python dataclasses in 2025. Are they still useful now that we have Pydantic...
Serverless on Google Cloud: What You Can and Can’t Do
➡️ Get started with Pulumi for free: https://www.pulumi.com/?utm_source=arjancodes. In this video, I’ll show you what Cloud Run Functions can and can’t do, how to work around common limitations, ...
MCP…. So What’s That All About?
✅ Learn how to build robust and scalable software architecture: https://arjan.codes/checklist. Want your AI tools to actually *do* something? In this video, I’ll show you how to integrate external...
Writing Python Functions Like a Mad Scientist
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Most Python developers stick with def, but there’s a whole world of alternative ways to define functions—some sma...
Should You Replace Every For Loop With Map and Filter?
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Think map() and filter() are always better than for loops? Not so fast. In this video, I’ll walk you through four ...
If I Were Starting Today, This Would Be My Tech Stack (2025)
💡 Save hours every week and bring your tasks, calendars, and AI assistant into one powerful app. Try AkiFlow here → https://akiflow.pro/ArjanCodes. Curious what tech stack powers ArjanCodes? In th...
10 Python Anti-Patterns That Are Breaking Your Code
➡️ Try Lokalise today: https://bit.ly/arjancodes. Think your Python code is clean? Think again. In this video, I’m exposing 10 Python anti-patterns that look smart, but secretly create chaos. Stic...
I’m in prison...
👷 Review code better and faster with my 3-Factor Framework: https://arjan.codes/diagnosis. In this video, I’ll give you a tour of the new office/studio space and share what’s next for ArjanCodes. ...
The REAL Reason You Should Use Type Hints in Python
👷 Review code better and faster with my 3-Factor Framework: https://arjan.codes/diagnosis. In this video, I’m going to show you why type hints in Python are useful, how to add them to your Python ...
The Hidden Dangers of Python Decorators
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. Python decorators look like a great way to add functionality—until they break your type safety, hide function requ...
10 Tips to Keep Your Software Simple
👉 Take your productivity to the next level and keep your team organized - try monday.com for free today: https://bit.ly/424BbYW. In this video, I’ll show you 10 essential tips to keep your code si...
How to Use Git Branches Like a Pro (FastAPI Example)
👉🏻 Streamline your Git workflow - get started with GitKraken for free: https://bit.ly/4j8AlRM. Confused about Git? You’re not alone — but after this video, you’ll have a clear understanding of mer...
Coupling 101: Design Choices That Make or Break Your Code
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. You've probably heard a lot of people argue against coupling. But the problem is that you actually need it. In thi...
How To Design Robust Python Functions
➡️ Try Lokalise today: https://bit.ly/arjancodes. In this video, I’m going to show you the main principles I use to write code that’s less likely to fail, with of course plenty of Python examples....
This Is How Marie Kondo Sets up Her Pytest
✅ Learn how to build robust and scalable software architecture: https://arjan.codes/checklist. In this video, I’m going to walk you through how to set up pytest from scratch in a really simple, mi...
This Is How You Write an Efficient Python Dockerfile
👷 Review code better and faster with my 3-Factor Framework: https://arjan.codes/diagnosis. In this video, I’ll take you step-by-step through creating an optimized and efficient Docker image. I’ll ...
12 Python Built-in Functions I Use Every Day
💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I’ll explore 12 of the most interesting and useful built-in functions, with examples, gotchas, and ...
An Introduction to Typescript for Python Programmers
➡️ Try Lokalise today: https://bit.ly/arjancodes. TypeScript and Python are both widely used, versatile, and powerful – but actually they couldn’t be more different! In this video, I’m going to ex...
How Python Evolves: From PEP to Feature
👉 Visit https://brilliant.org/ArjanCodes/ to try Brilliant for free for 30 days. You’ll also get 20% off an annual premium subscription. In this video, I’ll explore how Python gets new functionali...