Go from writing code to designing software with confidence.
AI can help you write code faster than ever. But becoming a more senior developer means learning to make the decisions behind the code. Learn to structure software, make better design decisions, and develop your engineering judgment.
Working code is only the beginning.
As your projects grow, the challenge shifts from writing code to making good decisions about how that code fits together.
Changes have unexpected consequences. Refactoring becomes harder. AI can suggest solutions, but you still need to judge which one actually fits your system.
That requires a different set of skills: understanding structure, dependencies, boundaries, and trade-offs.
Software Design Mastery
Software Design Mastery teaches you those skills and helps you develop the engineering judgment to use them confidently.
You'll learn to spot design problems, structure maintainable software, reason about trade-offs, and evaluate AI-generated code instead of simply accepting it.
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Core Designer
Learn to see what experienced developers see.
Responsibilities, coupling, boundaries, abstractions and domain modeling.
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System Designer
Learn to think beyond individual pieces of code.
Structure applications, manage dependencies and state, isolate infrastructure and design for change.
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Master Designer
Develop engineering judgment.
Compare alternatives, reason about trade-offs and confidently explain architectural decisions.
Not ready for Mastery yet?
Start with my free Software Design Guide.
The guide covers the key principles I use to design maintainable software. A practical introduction to the thinking I teach inside Software Design Mastery.
Free PDF, 7-step plan
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What my students say
I was formerly a Java Developer, this course assisted me in adjusting to the Python environment quickly and effectively. Many of the concepts taught in this course have found their way into my daily development.
I don't think I fully understood what a design principle was when I first started watching your channel. Between your YouTube channel and this course I definitely have a much better foundation to build on. Having this stuff explained in the context of a familiar language is invaluable.
I haven't completed the course yet, but I have already been able to apply some principles to my software planning and development at work
Hi, I'm Arjan.
I've spent more than 25 years teaching developers how to think about software. And there's a pattern I've seen again and again.
Learning syntax isn't the hardest part. Neither is learning another framework. The difficult transition happens when developers need to move beyond "How do I make the code work?" and start asking "How should this software be designed?"
That's the transition I focus on at ArjanCodes.
Through my YouTube channel, Software Design Mastery, and my work with software teams, I teach developers how to reason about code, make better design decisions, and build software they actually understand, even when AI is doing much of the coding.
- years teaching
- 25+
- Computer Science
- PhD
- YouTube subscribers
- 300K+
- students
- 5,000+
Want to develop these skills across your team?
Software Design Mastery is also available for development teams, with centralized purchasing and team access.
Watch my latest video.
I publish videos on software design, Python, and how to keep thinking clearly about code when AI writes more of it.