If you are in India, HasGeek's conferences are all for developers, and often pretty much the only conference on the topic in India (websites are still for 2014):
+1 this - mostly because they're all in the second or third iteration of the conference.
Take a look at the last few years' videos to get an idea of why this is worth attending, which is probably the harder detail for people who have to travel to attend conferences.
Feb 2015: Meta Refresh, on web UI (https://metarefresh.in) and Construkt Festival, on tech startups (http://construkt.me)
May 2015: Rootconf, on devops and cloud infrastructure (https://rootconf.in)
Jul 2015: The Fifth Elephant, on big data and analytics (https://fifthelephant.in)
Sep 2015: JSFoo, on JavaScript (https://jsfoo.in)
Dec 2015: Droidcon India, on Android (https://droidcon.in)
All conference videos are available at https://hasgeek.tv