Top 10 Websites for Coding Interview Preparation in 2024 - Best of Lot

If you are a fresher or final year graduate preparing for your placement interview, or a Java developer preparing for your next job and looking for some websites, blogs, and forums for programming interview questions then you have come to the right place. In the past, I have shared the essential skills for coding interviews, best coding interview books, and best courses for coding interviews as well as many programming interview questions on topics like data structure, system design, multithreading, database and SQL, Linux, etc. In this article, I am going to share some of the really good websites and resources that will help you to prepare and do well in programming interviews. 

The list includes popular websites and online platforms like Leetcode, HackerRank, and others where you can solve many coding problems asked in the actual interview as well as learn how to solve them.

I have also included blogs and websites which explain coding problems and techniques to solve them as I found them very useful for understanding and solving programming interview questions. Along the way, I have also included useful resources and online courses which you can join to further boost your coding interview preparation. 

If you like to read books, you can also see these popular books with lots of programming questions like Cracking the Coding Interview and Programming interview exposed, they are not the most interactive or comprehensive resources.

Since with time, interviews are also changing you need to keep yourself updated with the latest programming job interviews and Java questions. Now, you just cannot pass a programming job interview without writing code, which wasn't the case 10 years ago. 

Though I still recommend those books highly because Programming questions do not really change a lot, you can take the help of the following websites to learn more and prepare well for your Programming job interview.

Alternatively, you can also explore online courses like Master the Coding Interview: Big Tech (FAANG) Interviews by Andrei Negaoie on Udemy to properly prepare for coding Interviews.  They cover topics like data structure and algorithms, general programming, and bit manipulation, an important topic for interviews.

10 Best Websites and Places to Practice Coding Problems for Interviews in 2024

Here is my list of some of the useful websites and online platforms you can visit to prepare for your next programming job interview. The list includes websites, online platforms, blogs, as well as competitive programming websites like Topcoder where you will find really complex coding problems to challenge your skills. 

1. ByteByteGo by Alex Yu

One of the most important topic for Coding interview is System Design and this is one of the best platform to learn about System design concepts and also prepare for System Design Interview. This website is created by Alex Yu, author of popular System Design Interview – An insider's guide books, one of the most recommend books for System Design interview.  This website also serves as the digital version of his book but it offers much more than that. '

Alex has shared detailed, step by step framework to solve system design questions from interviews like How to design YouTube and How to design a chat system. He also regular share interesting content on System Design which are quite useful to learn about essential System design concepts like scaling, caching and distribute messaging. 

If you are preparing for Coding interview or System design interview then I highly recommend you to checkout this website and join his course. You can also use  code JALJAD to get 10% discount, specially secured for Javarevisited reader.

Here is the link to join this course - 10% discount on ByteByteGo

2. LeetCode

LeetCode is a great and relatively new website with a huge number of questions. It's the real site for preparing a programming job interview. It has got coding problems with a well-defined problem statement and asks you to solve the problem and submit the solution to any of you.

By the way, if you have trouble solving LeetCode problems then you can also check out Bit Punch's LeetCode in Python: 50 Algorithms Coding Interview Question course on Udemy. This course goes through hard to easy LeetCode problems and explains to you how to solve them.

3. DesignGuru

DesignGuru is another awesome place to preapre for Coding interviews in 2024. It’s actually quite popular online platform for Software Engineers to prepare for Coding interviews.

If you have been taking online courses then you may have come across courses like Grokking the System Design Course or Grokking the Coding Interview Courses, well these are the courses which have been created by Arslan Ahmad and available DesignGuru.

I have been taking their courses on Educative.io but now that they have moved out from that platform and it create their own online platform, it make sense to join them for just their Grokking interview courses.

If you are also preparing for coding interviews then you can join Design Guru to get access of not just their System Design courses but also many other coding interview courses

Here is the link to join DesignGuru — Join Deisign Guru

But, they are not stopping there, they are creating more and better courses to assist Software Engineers cracking coding interviews of FAANG and other technical companies.

So joining them will definitely help you with your tech interview preparation. You can also use discount code and coupon GURU for 30% discount, only for Javarevisited followers.

They even offer a bundle of all courses where you can buy all of their courses for big discount. If you want to excel on coding interview and prepare well, I highly recommend to get this bundle, its really useful.

4. Exponent

This is another great website to learn about System design and prepare for Coding interviews, especial for FAANG companies. There System Design Interview Course has 36 lessons and it provides solutions of system design questions like Design Twitter, Instagram, Parking lot, design a Web Crawler, and many other popular Software design questions.

They also have dedicated course for different FAANG companies, For example they have a dedicate course for Amazon SDE interview which not only prepare you for tech round but also conduct mock interviews to check your actual preparation level. They also have a similar courses for Google interview as well.

The best thing I liked about Exponent is their mock interviews which is like real drill as well 1-to-1 coaching and interactive discussion on popular interview questions from Google, Facebook, Microsoft and Amazon,

If you are preparing for System design interviews on FAANG companies then I highly recommend this course and website and you can join them for just $12 a month now (70% discount).

Here is the link to join Exponent - Try Exponent now

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5. GeeksForGeeks

GeeksForGeeks is a great website that has lots of programming questions from various tech companies like Amazon, Google, Facebook, Microsoft, Flipkart, Uber, etc. It's mainly a user contribution-based website where users contribute programming questions in the form of short summaries and articles.

The GeeksForGeeks team also write an article to explain concepts that are important from the programming point of view like data structure and algorithms like Trie, Red Black Tree, Self-Balanced Tree, etc.

Overall a comprehensive source for lots of programming questions but you need to spend the time to find good ones. However, if you find trouble solving GeeksForGeeks coding problems then I also recommend you to first go through Grokking the Coding Interview: Patterns for Coding Questions course on Educative.

It will teach you common coding patterns like sliding windows, fast and slow pointer, merge interval, etc which can be applied to many coding problems. These are essential for any programmer and help a lot to solve a new coding problem during the interview.

By the way, Educative is also a great platform for preparing for coding interviews. It has so many good interactive courses like Grokking the System Design Interview, Grokking The object-oriented programming interview, and Dynamic Programming which can help you better prepare for coding interviews.

And if you find those interactive courses useful, consider getting an Educative subscription which costs around $18 per month and provides access to their 100+ software engineering courses including these ones. It's both cost-effective and the best way to prepare for your coding interviews.

6. HackerRank

Another website is full of challenging coding problems. You can join the website not just for programming job interview questions but also to improve your coding skills by solving challenging questions.

The good thing about HackerRank is that it's also used by many companies for technical assessment and remote interviews which means if you have a strong profile on HackerRank you may get matched with a suitable opportunity. 

If that's not enough, more than 11 million developers use HackerRank to practice coding skills, prepare for interviews, and get hired. You can be one of them too. 

However, if you want to prepare a topic from scratch like algorithms, I suggest joining a comprehensive course like Data Structure and Algorithms: Deep Dive Using Java on Udemy.

7. Javarevisited 

Disclaimer first, this is my blog. I mostly provide a frequently asked, curated list of programming interview questions on various topics like Java, Coding, String, Array, Data Structure and Algorithms, Design pattern, Servlet, JSP, Spring, Hibernate, Web service, REST, SOAP, UNIX, Linux, SQL, and Database, etc.

It basically contains several articles to help you prepare well for your programming interviews, particularly for Java Job interviews. I also take the time to explain which answer is right and what is wrong and why so you can learn as well while preparing for programming job interviews.

8. CareerCup

A website where you will find a lot of programming job interview questions from different companies. This site is founded by Gayle Laakmann McDowell, author of Cracking the Coding Interview book and other famous books around Job interviews. This is a great resource for people preparing for technical job interviews. 

9. Code Career Blog

Another blog where you will find a lot of programming job interview questions and their solution with proper analysis. Blogger, Harry He is also the author of Coding Interviews: Questions, Analysis & Solutions, one of the excellent books to prepare for Programming Job interviews.

10. Java67

Well, this is the site where you are currently, reading this very own article. I have shared a lot of useful programming job questions. You can find them by topic like an array, string, linked list, binary tree, etc. 

Alternatively, you can also use the search bar to search for coding interview questions and if you are in hurry then I strongly suggest you at least check out these 100+ data structure questions and 10 SQL query questions from Programming job interviews before you go for your next coding interviews. 

These are two of the most important topic for any programming job interviews and having gone through them you will have a better understanding of what to expect on technical job interviews.

 

11. Spoj 

very tough and with real-time algorithms and only recommend if you have enough time in your hand and you truly want to master your coding skills. 

12. CodeChef

It's a great online platform for Aspiring programmers. Created by Directi, one of the leading software company this platform help you learn and master Algorithms and Computer Programming. You will also find a lot of programming contests on this site. It also provides certifications.

13. TopCoder

A large number of Practice Problems. Some of them are very tough to solve but you will learn a lot if you attempt those questions. There are also competitions and bounty programs where you can not only learn but also earn by solving technical coding problems. 

This is also one of the most comprehensive resources where you will find competitive programming questions and articles, almost 900 articles, videos, and forum posts. They also have high-quality resources on Data Science, Design, and Development. 

Some of the top problems from Topcoder websites includes Dynamic programming problems like

Solving snake and Ladder game, where you will learn how to solve DP-based problems using this real-world example.

You can also use their problem archive to solve many recursion, and the dynamic programming-based problem like PaintBallFreeForAll, PackageSizes, CountTilins to further improve your Dynamic Programming skills. 

By the way, if you struggle to solve Dynamic programming problems then you can also check out this Dynamic Programming course on Udemy which will teach you essential dynamic programming patterns and tips to identify dynamic programming problems. 

That's all about this list of top websites for Programming interview questions. Depending upon which niche you are you can also focus on one of the sites for data structure and algorithms, GeeksforGeek has got a large number of problems but Javarevisited is the best for preparing Java interviews.

LeetCode is also a great resource for data structure and algorithms particularly String and array, and nowadays it's also got some SQL and database questions and some bash script questions.

Other Programming Resources you may like

• 15 Recursion Coding Interview Questions with solutions
• 20+ binary tree coding problems for practice
• 21 String coding problem for practice
• 20+ array coding problems for practice
• 20 System Design Interview Questions 
• 20 linked list coding problems for practice
• 5 Free Spring  Framework Courses for Java Developers
• 5 Courses to Learn Shell Scripting in Linux
• 5 Online Courses to learn Core Java for Free
• 5 Online training courses to learn Angular for Free
• 5 Free Courses to Learn Data Structures and Algorithms
• 5 Courses to learn Android for Java Developers
• 5 Free Courses to Learn Git and Github
• 50+ Data Structure and Algorithms Questions from Interviews
• 10 Data Structure and Algorithm Courses for Interviews

Thanks for reading this article so far. If you like these best websites to prepare well for programming job interviews then please share with your friends and colleagues. If you have any questions or feedback then please drop a note.

P.S. - If you prefer books then you can also check out my list of top 10 books to prepare coding interviews.