25th January was a rather unfortunate day for us. The monthly challenge - January Jackpot 2014 which was scheduled at 9:30 PM that day was cancelled due to turn of events going wrong at the worst possible time. We regret once again for the incovenience caused to you, and this is a postemortem of wha...

HackerEarth hosted more than thousand contests in the year 2013 alone. Out of them, there were more than two dozen public programming contests by HackerEarth itself. They include our monthly challenges and hiring challenges. There were over 200 internal and public contests by colleges in the previou...

Ever thought of sharing solution of a coding problem in form of a video with someone, to teach them how you implemented the solution. Or, wanted to see what’s the thought process of a potential employee when he/she solves a difficult problem. Ofcourse you have thought about it. But, it was not exact...

HackerEarth is primarily based on Python & Django. And we use Apache with mod_wsgi for hosting the application. There is a general complaint that Apache sucks when it comes to hosting Python web applications. It’s said that it’s slow, bloated, uses lots of memory and doesn’t perform very well. It’s ...

###MySQL - Primary data store At HackerEarth, we use MySQL database as the primary data store. We have experimented with a few NoSQL databases on the way, but the results have been largely unsatisfactory. The distributed databases like MongoDB or CouchDB aren’t very scalable or stable. Right now, ou...

40,000+ programmers use HackerEarth. Everyday, people from all over India and other countries submit code on HackerEarth, solve problems and participate in online coding tests. Our CodeFactory server has processed over 500,000 requests till now. There are different types of challenges running every ...

We had already published HackerEarth API v1 in February, 2012 at http://developer.hackerearth.com. The API v1 was synchronous in nature. This means that your request kept hanging until the code evaluation was done and response was received. This seriously limited anyone from writing robust applicati...

This is one of the coolest and important thing we recently built at HackerEarth. What’s so cool about it? Just have a little patience, you will soon find out. But make sure you read till the end :) I will try to make this post as resourceful, and clear so that people who always wondered how to imple...

After a long journey with Django, you come to a place where you feel the need to get some tasks done asynchronously without any supervision of human. Some tasks need to be scheduled to run once at a particular time or after some time and some tasks have to be run periodically like crontab. One of th...

This is going to be a long blog post but I promise you will find some interesting piece of engineering here, so stay till the end. The realtime server manages the live update of webpages when the data changes in the data storage system (database or cache). We had a realtime server in-place but there...

Originally posted as Quora answer. This might take a while, so go grab some popcorn. You are going to enjoy this :) At HackerEarth, we deeply believe in open-source. Why not, our roots are in there. We use open-source software, hack it according to our needs and create something amazing out of that....

First view the awesome charts and graph for [HackerEarth Practice Challenge] (http://www.hackerearth.com/hackerearth-practice-challenge/analytics/). I will explain it’s implementation details later in the post. Why bother for Challenge Analytics? We thrive on challenge but challenge is no fun withou...

The Inception January 2012 was an idyllic time for us. Three of us had just teamed up to build something cool. There was no planning for the future, no sort of agreement - we were just three geeks sitting in the dorm room who wanted to build a product. We started working on MyCareerStack where there...

tl;dr Check out https://github.com/HackerEarth/hackerearth.vim I love Vim editor. And the idea of a plugin to compile and run code from my favorite code editor sounded exciting. HackerEarth API made it easier. Oh man - this is going to be the coolest thing I have ever built. Whoa, wait a minute. Are...