10 Free Platforms to Brush Up your Coding Skills Before Interviews

Ganapathi Kakkirala
4 min readNov 26, 2021

Giving interviews is a nerve-wracking task for most people, more so for the field of data science and the various subjects under its canopy. I have curated a resource list of online platforms, blog posts and more, to make sure you walk into your interview fully confident and prepared with answers for any questions.

This list is of no particular order and doesn’t mean that 1st platform is better than the 2nd. Let us walk through the list of platforms available to practice programming and boost our expertise before interviews.

1. Codewars

Codewars provides a large collection of coding challenges submitted and edited by their own community. You can solve the challenges directly online in their editor using 20+ programming languages. You can view a discussion for each challenge as well as user solutions. You can earn points and climb the rankings by solving their challenges.

Explore here: https://www.codewars.com/

2. Edabit

Edabit is great for beginners looking to practice their coding skills daily by solving bite-sized challenges. Once you reach the intermediate stage, other sites provide harder challenges and more content geared towards competitive programming and job interviews.

Explore here: https://edabit.com/

3. Hackerrank

HackerRank is great for intermediate-to-advanced programmers who have already picked up the basics of a language and are ready to solve more complicated problems. The challenges are written with mathematical notation and can sometimes be a little confusing, which is why it might not be so great for beginner developers.

Explore here: https://www.hackerrank.com/

4. HackerEarth:

HackerEarth is an Indian software company headquartered in San Francisco, US, that provides enterprise software that helps organisations with their technical hiring needs. HackerEarth is used by organizations for technical skill assessment and remote video interviewing.

Explore here: https://www.hackerearth.com/

5. Exersism

Exercism exists to help as many people as possible attain fluency in any programming language they want. Programming skills can be source of great fun and a route to social mobility and we want to help people regardless of their backgrounds or their motivations.

Explore Here: https://exercism.org/

6. InterviewBit

InterviewBit is a platform to learn skills that you need for technology jobs. Ithelp you polish your skills and get ready for the job, whether you are a fresh college graduate or a working professional.

Explore Here: https://www.interviewbit.com/practice/

Preferable for Data Science Interview Preparation

8. StrataScratch

StrataScratch is a community-driven platform for data scientists with exercises, resources, and guidance to help prepare you for your next interview, simply improve your analytical skills, or guide you to a successful career. The building blocks to a successful career in Data Science.

Explore Here: https://www.stratascratch.com/

9. thedsinterview.com

The Data Science Interview is the go-to platform for all candidates who want to train for data science positions interviews in companies ranging from local start-ups to Fortune 500 companies.

We provide candidates with interactives training based on 1000+ real interviews questions sourced from the most successful companies hiring data scientists.
Best of all: it’s free.

Explore Here: https://www.thedsinterview.com/

10. Chris Albon

This website has the resources related to data science concepts that one can practice before interviews to brush up the basics.

Explore Here: https://chrisalbon.com/

Conclusion:

It’s never too late to start coding today. If you are already a programmer, or an expert in the field, kudos to you, and I hope that you’ll flourish in your journey!

I hope you found the list useful and that I have motivated you to start coding.

Thanks for reading and Stay Safe!

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Ganapathi Kakkirala

A technology and business enthusiast with a passion to write and share knowledge through blogs.