Last updated: November 2026. Written by Josh Hutcheson, OnlineCourseing editor. See our review methodology.
QUICK VERDICT
Bottom line: design patterns are named, proven solutions to problems every developer eventually hits, and they are best learned in the language you already use. Dmitri Nesteruk’s Design Patterns in C# and .NET is the most complete course we found; the University of Alberta’s Coursera course is the best structured option with a certificate; and for Java, Educative’s Software Design Patterns is more current than Nesteruk’s 2020 Java version. We checked every course page on 2 November 2026.
- Best overall: Design Patterns in C# and .NET (4.6, 14,157 ratings, 20h 40m, updated 8/2025)
- Best with a certificate: Design Patterns, University of Alberta on Coursera (4.7, 1,382 reviews)
- Best for Java: Software Design Patterns: Best Practices (Educative, 4.6)
- Skip a paid course if: you only want a reference; Refactoring.Guru covers every pattern free
Design patterns are the shared vocabulary of experienced developers: named, reusable answers to recurring problems in object-oriented design. Learning them makes your own code easier to extend and makes large codebases readable, because you start recognizing a Factory or an Observer instead of puzzling over the mechanics. The ideas transfer across languages, but the code does not, so pick a course in the language you write every day. One warning up front: several popular design-patterns courses have not been updated in years. We list the last-updated date for each one so you can judge.
The best design patterns courses at a glance
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| Course | Best for | Rating (2 Nov 2026) | Last updated | Platform |
|---|---|---|---|---|
| Design Patterns in C# and .NET | C# and .NET developers | 4.6 (14,157) | 8/2025 | Udemy |
| Design Patterns in Java | Java developers who like video | 4.5 (9,804) | 4/2020 | Udemy |
| Design Patterns in JavaScript | JavaScript developers | 4.6 (2,365) | 8/2021 | Udemy |
| Design Patterns in Python | Python developers | 4.3 (4,476) | 8/2020 | Udemy |
| Design Patterns (University of Alberta) | Structured course, certificate | 4.7 (1,382 reviews) | Open enrollment | Coursera |
| Software Design Patterns: Best Practices | Java developers, text-based | 4.6 | Updated this week | Educative |
| Refactoring.Guru | A free, illustrated reference | Free | Maintained | Web |
1. Design Patterns in C# and .NET (Dmitri Nesteruk) — best overall
Nesteruk’s course is the most thorough single design-patterns course we found: 20 hours 40 minutes across 174 lectures, rated 4.6 from 14,157 ratings, with 101,071 students, last updated August 2025. It walks through all 23 Gang of Four patterns (creational, structural and behavioral) in modern C# and .NET, and for each one discusses when the pattern helps, how to refactor an existing design toward it, and when it is overkill. That last part is what separates a good patterns course from a catalog. If you write C# or .NET, this is the one to take.
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Design Patterns in C# and .NET. All 23 Gang of Four patterns with practical C# examples, about 21 hours, updated August 2025. Lifetime access. Affiliate partnership: we may earn a commission when you enroll through our link, at no extra cost to you.
2. Design Patterns in Java / JavaScript (Dmitri Nesteruk) — same course, your language
Nesteruk teaches parallel versions of his course, which is useful because patterns are language-agnostic in concept but language-specific in code. Check the update dates before you buy, though: the other versions are much older than the C# one.
- Design Patterns in Java: 4.5 from 9,804 ratings, 63,863 students, last updated April 2020. The patterns have not changed, but the Java has: records and sealed classes, added in 2021, simplify several patterns, and this version predates them.
- Design Patterns in JavaScript: 4.6 from 2,365 ratings, 21,795 students, last updated August 2021. It adapts the patterns to JavaScript idioms, where first-class functions make some of them unnecessary.
- Design Patterns in Python: 4.3 from 4,476 ratings, 32,498 students, last updated August 2020, the lowest-rated version.
Choose the one that matches the code you write, not the one with the highest rating in the abstract. For Java specifically, we now recommend Educative’s course (pick 4 below) first because it is current.
3. Design Patterns (University of Alberta, Coursera) — structured with a certificate
Kenny Wong’s course from the University of Alberta is part of Coursera’s Software Design and Architecture Specialization. It is rated 4.7 from 1,382 reviews, with 107,589 learners enrolled, at intermediate level. The four modules cover creational and structural patterns (about 5 hours), behavioral patterns (about 4 hours), working with patterns and anti-patterns (about 4 hours, including refactoring code smells and the model-view-controller pattern), and a capstone challenge. Coursera estimates two weeks at ten hours a week. It suits learners who want a graded, academic treatment and a shareable certificate, and it is the natural pick if you plan to take the rest of the specialization.
Free ways to learn design patterns
Refactoring.Guru is the standout free resource: clear, illustrated explanations of every Gang of Four pattern with code samples in multiple languages, plus a catalog of code smells and refactorings. The original Design Patterns: Elements of Reusable Object-Oriented Software by the “Gang of Four” (Gamma, Helm, Johnson and Vlissides) is the canonical source, though developers on r/learnprogramming often call it too dry to learn from and its examples dated. For game developers, Bob Nystrom’s Game Programming Patterns is free to read online and explains patterns through game code, which several Redditors said made them easier to remember. For most developers, Refactoring.Guru plus practice on real code is enough; a paid course adds a guided sequence and video walkthroughs.
Do you need a design patterns certification?
No. There is no widely recognized design-patterns certification, and interviewers test the knowledge directly rather than asking for a credential. Patterns come up in object-oriented-design and system-design interviews, where you are expected to apply them to a problem, not name-drop them. Course certificates (Coursera’s shareable certificate, Udemy’s certificate of completion) show you finished a course; your ability to recognize and justify a pattern in real code is what gets tested.
What to look for in a good course
Design-patterns courses vary in how practical and how current they are. Look for:
- Your language. Patterns are best learned in the language you write. Prefer a course that implements them in C#, Java, JavaScript or Python rather than pseudocode.
- All three categories. A complete course covers creational, structural and behavioral patterns, the full Gang of Four set, not just the handful everyone knows.
- When-not-to-use guidance. The mark of a good patterns course is restraint: when a pattern adds needless complexity. Overuse is a real hazard; one Redditor described a team whose heavy use of Strategy made the design harder to follow, not easier.
- A recent update. The patterns are stable, but languages are not. A 2020 Java course predates records and sealed classes; a current course can use them.
Design patterns are one of the clearest dividing lines between junior and senior developers: they are how experienced engineers talk about structure and keep large systems maintainable. That makes the topic a high-return investment once you have the object-oriented foundation to appreciate it.
Frequently asked questions
Should I learn design patterns as a beginner?
Not first. Design patterns assume you are comfortable with object-oriented programming: classes, interfaces, inheritance and composition. Get solid on OOP and build a few projects first; patterns make far more sense once you have felt the problems they solve.
Are design patterns still relevant in 2026?
Yes. The Gang of Four patterns remain part of professional software design and a common topic in senior engineering and system-design interviews. Some matter less in functional or modern-framework code (dependency injection containers and lambdas absorb several), but the vocabulary and the design thinking are still expected. AI coding assistants also generate patterned code, and you need the vocabulary to judge whether it is the right pattern.
Do design patterns differ between languages?
The concepts are the same; the implementation differs. A Singleton or Observer looks different in C#, Java and JavaScript, and some patterns are less necessary in languages with first-class functions. That is why we recommend taking a patterns course in the language you actually use.
How long does it take to learn design patterns?
You can understand the common patterns in a few weeks of study; the Coursera course estimates two weeks at ten hours a week. Knowing when to use each one, and when not to, comes from applying them on real projects over months.
4. Software Design Patterns: Best Practices (Educative) — best current Java course
C. H. Afzal’s text-based course on Educative is rated 4.6, has 27 lessons and takes about eight hours. It teaches every pattern in Java: Builder with a Director, thread-safe Singleton variants (synchronized access and double-checked locking), Prototype with shallow and deep copies, Factory Method and Abstract Factory, all seven structural patterns, and the behavioral patterns from Chain of Responsibility to Visitor. Educative marked it as updated in the week we checked, and its code runs in the browser. We rank it above Nesteruk’s 2020 Java course for anyone learning patterns in Java today; choose Nesteruk’s video version only if you strongly prefer video.
Books developers recommend
Books suit design patterns better than most topics, because you will come back to them as a reference. The two the developer threads we read recommend most:
- Head First Design Patterns, 2nd edition, by Eric Freeman and Elisabeth Robson (O’Reilly, December 2020, 672 pages). The most-recommended first book: visual, conversational and built around Java examples. Several Redditors recommend it over the original Gang of Four book for learning.
- Design Patterns: Elements of Reusable Object-Oriented Software by Gamma, Helm, Johnson and Vlissides (1994). The original catalog of the 23 patterns. Read it after an introduction; as a first book it is dense.
Bing’s search data shows the same pattern: “gang of four design patterns” and “head first design patterns” are among the most-searched design-patterns phrases after the bare term.
The 23 Gang of Four patterns at a glance
Every course on this page is organized around these three groups. Knowing the map helps you check a syllabus for gaps.
| Group | What the patterns do | Patterns |
|---|---|---|
| Creational (5) | Control how objects are created | Factory Method, Abstract Factory, Builder, Prototype, Singleton |
| Structural (7) | Assemble objects and classes into larger structures | Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy |
| Behavioral (11) | Assign responsibilities and manage communication between objects | Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor |
You do not need all 23 on day one. In the discussions we read, working developers said they meet Singleton, Factory, Builder, Observer, Strategy, State and Command most often, and use dependency injection constantly. Start there.
How to learn design patterns (a plan that works)
- Get solid on OOP first: interfaces, composition over inheritance, and the SOLID principles.
- Take one course in your language from this page and code each pattern yourself in a tiny example, not just watch it.
- Pick three to five patterns that fit your own work and use them on a real feature. Developers who learned patterns well say this step is where they stuck.
- Read code that uses them. Frameworks are full of patterns: Spring uses Factory and Proxy, event systems use Observer, and UI frameworks use Composite and Command.
- Practice restraint. When a simple function would do, use it. A pattern earns its place when it makes the next change easier.
If you are moving toward architecture, the same thinking scales up to distributed systems: see our best microservices courses for the patterns used between services, such as the API gateway, saga and circuit breaker.
How design patterns change by language
This is the practical reason to take a course in your own language. The same pattern often looks very different, and sometimes disappears, depending on what the language gives you:
| Pattern | Classic object-oriented version | What modern languages often use instead |
|---|---|---|
| Strategy | An interface with one class per algorithm | Pass a function or lambda (C#, Java, JavaScript, Python) |
| Observer | Subject and observer interfaces with subscribe and notify methods | C# events and delegates, JavaScript event emitters, reactive streams |
| Singleton | A private constructor and a static instance | A module-level object in Python or JavaScript; a single registration in a dependency injection container |
| Iterator | An iterator class with next and hasNext | Built-in iteration: foreach and yield in C#, generators in Python and JavaScript |
| Decorator | A wrapper class implementing the same interface | Python decorators for functions; middleware pipelines in web frameworks |
| Command | A command object with an execute method | A stored function or closure, often with an undo function beside it |
That does not make the patterns obsolete. The problem each one solves is still there; the language just gives you a shorter way to write the solution. A good course shows both: the classic structure, so you recognize it in older code and in interviews, and the idiomatic version you would write today. This is also why a dated course is a real cost. The C# version on this page was updated in 2025, while the Java, JavaScript and Python versions date from 2020 and 2021 and show less of the modern idiom.
Design patterns in interviews
Patterns come up most in object-oriented design rounds, often called low-level design. A typical prompt asks you to design a parking lot, a vending machine, an elevator controller or a library system in classes. Interviewers are not checking whether you can recite the 23 patterns. They want to see you spot where a pattern fits (State for a vending machine’s modes, Strategy for pricing rules, Observer for notifications, Factory for creating vehicle types) and explain the trade-off you are making. Naming a pattern you then apply badly hurts more than not naming it at all.
To prepare, take one course from this page, then practice three or four classic design prompts out loud, drawing the classes and saying which pattern you chose and why. The Coursera course’s anti-patterns module and capstone are good practice for the “what is wrong with this design” questions that senior interviews also ask.
How we chose these courses
We re-loaded every course page in a clean browser on 2 November 2026 and recorded the rating, rating count, student count, length and last-updated date. We read four Reddit threads on r/learnprogramming, r/developersIndia and r/CodingHelp about how developers learned patterns, and Bing’s keyword data for the phrases people search. We rank on completeness (all 23 patterns), how current the code is, and whether the course teaches when not to use a pattern. Some links are affiliate links, which means we may earn a commission at no extra cost to you; that never decides the order. Ratings change, so check the course page before you buy.
More questions about design patterns courses
What is the best design patterns course?
For C# and .NET developers, Dmitri Nesteruk’s Design Patterns in C# and .NET on Udemy (4.6 from 14,157 ratings, about 21 hours, updated August 2025). For a structured course with a certificate, the University of Alberta’s Design Patterns on Coursera (4.7 from 1,382 reviews). For Java, Educative’s Software Design Patterns course is the most current option we found.
How many design patterns are there?
The classic Gang of Four book describes 23 patterns in three groups: creational (5), structural (7) and behavioral (11). Many more patterns exist (architectural, concurrency, cloud and game patterns), but the 23 are the shared vocabulary most courses and interviews start from.
How should I learn design patterns?
Learn object-oriented basics first, then take one course in the language you write, and implement each pattern yourself in a small example. After that, pick three to five patterns that fit your own codebase and use them for real. Developers we read on Reddit agree that implementing a few beats memorizing all 23.
Which design patterns are used most?
In the developer discussions we read, the patterns people meet most often are Singleton, Factory, Builder, Observer, Strategy, State and Command, plus dependency injection, which most modern frameworks build in. Observer shows up in almost every event-driven framework, and Builder saves you from constructors with many optional parameters.
Is the Gang of Four book still worth reading?
As a reference, yes; as a first book, usually not. Developers often call it dry and its examples dated. Head First Design Patterns (2nd edition, 2020) is the friendlier introduction, and Refactoring.Guru covers the same patterns free with modern code.
What is the best way to learn design patterns in Python?
Nesteruk’s Design Patterns in Python is the only dedicated Python video course on this page, but it was last updated in August 2020 and is the lowest-rated version (4.3). Many Python developers do better pairing Refactoring.Guru’s free Python catalog, which gives each pattern a Python code example and notes on how it is used in Python, with Head First Design Patterns for the reasoning. Expect several patterns to shrink in Python: modules replace most Singletons, decorators are built into the language, and functions replace one-method Strategy classes.
What are agentic design patterns?
A different subject. “Agentic design patterns” describe ways to structure AI agents built on large language models, for example having an agent review its own output or call external tools. They borrow the name, not the content, from software design patterns; the courses on this page teach the classic object-oriented patterns.
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