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HackerEarth is a coding skill practice and testing service that in a series of well written articles describes the trials and tribulations of building their site and how they overcame them: Scaling Python/Django application with Apache and mod_wsgi, Programming challenges, uptime, and mistakes in 2013, Post-mortem: The big outage on January 25, 2014, The Robust Realtime Server, 100,000 strong - CodeFactory server, Scaling database with Django and HAProxy, Continuous Deployment System, HackerEarth Technology Stack.
What characterizes these articles and makes them especially helpful is a drive for improvement and an openness towards reporting what didn't work and how they figured out what would work.
As they say, mistakes happen when you are building a complex product with a team of just 3-4 engineers, but investing in infrastructure allowed them to take more breaks, roam the streets of Bangalore while their servers are happily serving thousands of requests every minute, while reaching a 50,000 user base with ease.
Here's a gloss on how they did it:
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