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Coding interview questions: Top 5 websites to visit for preparation

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In this era of technology, one thing is certain, programming jobs will always will be in demand. For programmers seeking a new job or perhaps advance in the current one, technical interviews play a crucial role. There are a number of resources on the Internet that help coders plan, prepare and practice the interview questions. Be it database, SQL, data structure or algorithms, you can find the most commonly asked questions by corporate giants like Microsoft, Google, Facebook or Amazon. They help you hone your coding ability, technical knowledge or problem solving skills. The technical interviews that are done on-site will have candidates solve algorithms, puzzles, programming problems and related technical questions. If you are looking to explore the power-packed websites that help prepare for coding interviews and challenges, here are your best bets.

HackerRank

This right here is a haven for programmers. Launched in the year 2009, HackerRank has been a hiring platform for more than 2,000 companies globally. The website claims it has more than 11 million developers that have registered for practicing coding skills. For interview preparation, there are a curated list of of challenges and tips based on insights from 1000+ companies. You can either start with the Interview Preparation Kit or head to “learn to code in 30 days” for beginners. The Interview Preparation Kit has Warm-up Challenges, Dictionaries and Hashmaps, Sorting, String Manipulation, Arrays, Greedy Algorithms, Stacks and Queues, Graphs, Trees, Linked Lists and Recursion/Backtracking. Skills available for practice include Algorithms, C, Python, Databases, Ruby, C++, Data Structures, Artificial Intelligence, Regex, Mathematics, Java and SQL. You can also get certified and gain an edge over others. Certifications are available under titles Problem Solving, Rest API, Node.js, Angular, React, JavaScript, Python and Java.

If you are confident on your skillsets, sign up for the contests and solve challenges that have a score of 100. HackerRank is known to organize coding contests and simultaneously awards the winners for the hard work they put in. It is used by some of the top-notch companies that recruit candidates right off the website. So, if you can code the programs, there is a good chance that a company might select you, depending on your performance. Candidates, who are preparing for the developer-level exams, like the Python Developer or Machine Learning, can test the skills with the coding rounds. HackerRank is addictive too. Once you get started, there is a high chance you could spend hours solving coding challenges that are hard to crack. Fun, isn’t it?

LeetCode

LeetCode is a relatively new platform, but that has not hampered the functionality even a bit. Competing with old and established portals, the feat of gaining considerable popularity in less time defines how good the portal is. If you are preparing for a programming interview, the site is a real asset. You can start by creating an account using your email address. LeetCode has an expanding library of numerous questions. At present, the portal supports C, C++, Python, Java, JavaScript, C#, Swift, Ruby, Go, MySQL, and Bash. The curated list of interview questions are categorised under Easy, Medium and Hard. Additionally, you also have dedicated chapters and challenges designed according to those frequently asked by technological giants. List includes Facebook, Google, Microsoft, Amazon, Apple, Adobe, Yelp, Uber, LinkedIn and Bloomberg.

The website claims there are over 1,800 questions for developers to practice. Topics that are covered include Array, Math, String, Binary Search, Stack, Design, Heap, Graph, Segment Tree, Backtracking, Hash Table, and Trie. Currently, the platform supports 14 coding languages and even offers development tools that help test or debug codes. On each of the challenges, you will have a description, along with examples. If you need solutions for the challenges, you might need to activate a monthly or yearly premium subscription.

Educative
Educative is defined by its name. The website has got text-based courses on a wide range of topics. You can find dynamic programming, system design, multithreading and concurrency, object-oriented programming, and so much more, right here. Currently boasting of half a million users, the platform has courses designed for new as well as experienced developers. Interview preparation resources are available for Python, JavaScript, PHP, HTML5, C++, Java, Algorithms, Recursion, Ruby, Data Structures and System Design. It can be accessed on the web and practiced with live code environments. There are also built in assessments to test your skills. On each module, you will find lessons, challenges and illustrations. The course page has an overview and provides list of contents as well. While you can join for free, a paid annual plan will provide unlimited access for 12 months, along with completion certificates. The learners here are already employed with firms such as Visa, Salesforce, Dropbox, Microsoft and Amazon.

GeeksforGeeks
If you are looking for a website that can give you access to the programming questions from crème de la crème of tech companies such as Microsoft, Amazon, Google, Flipkart, Uber, and Facebook, this is your pick. The website offers a wealth of resources in the form of content and videos, mostly through user contributions. Additionally, an expert team prepares content, challenges and questions from the programming point of view.  The website supplies fresh questions each year, asked by companies in their interview processes. So if you are looking for a platform, with a variety of coding problems right from the basics to a much advanced level, this is one destination to bookmark. 

Content on the website is organised under Tutorials, with sub topics such as Algorithms (Searching, Sorting, Graph, Pattern, Geometric, Greedy, Backtracking etc), Data Structures (Arrays, Stack, Queue, Binary Tree, Heap, Hashing, Matrix, Strings), Languages (C++, Java, Python, SQL, PHP, Perl, HTML, CSS and C#), Interview Corner, GATE, and Web Technologies. For interview preparations, you can go by top topics or company specific preparation. Find coding interviews and challenges designed for Amazon, Samsung, Microsoft, Oracle, Google, Flipkart, Goldman Sachs, Paytm, Morgan Stanley, SAP Labs, Ola Cabs, VMware, TCS, Wipro, Infosys, IBM, Cognizant, Philips, NTT Data, Intuit, Snapdeal, Zoho, Accenture, Intel, Deloitte, HCL, Dell, and Hewlett Packard. The interview preparation content includes articles, coding problems, video tutorials and subjective problems. If you are new, start with solving the Basic problems like arrays, strings and before moving to Medium and Gard levels. Registered users can track their progress and get ranked as well.

CodeSignal
Started in the year 2014, CodeSignal is another great tool to consider for problem solving, learning as well as experimenting. It has products designed for both employers as well as job seekers. The platform has 1000+ coding questions, ranging in terms of topic, difficulty, and theme. Users can get started by registering with their email. Similar to the platforms listed above, on CodeSignal as well you can practice for technical interviews through assessments in an advanced integrated development environment. Since large technology giants use CodeSignal to invite candidates to participate in technical interview session, it might be effective in rehearsing and brushing up on skills. CodeSignal supports more than 35 languages, including C, C++, Java, Perl, PHP, Python, Scala and Visual Basic. Users receive a score on all challenges and assessments taken. With the score, you are also provided insight into strengths and weaknesses. All of this leads to a Predictive Coding Score, much like the credit score. 

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