i think nothing works like content creation. For HackerEarth, content would be algorithm tutorials, ACM problem solutions, or simply some language basics. Once you know what kind of content to generate, SEO and google ads on those content is a really effective growth strategy.

To tell you that it works. I actually recently signed up on your website and I found you through your notes section. I think it needs some SEO work..

Also try to be more innovative. Acquiring developer is easy and hard at the same time. Easy because developers are very active online. Hard because there are tons of websites and blogs that are fighting for their attention. As a developer, I have clicked on very few ads. But I have almost always clicked on a good article..

All the best. tweet me @vishal_in if I can help ..