Is it ok to work in Laravel and CodeIgniter side way? Will it kill my learningcurve ?

I think you will end up using different frameworks for different solutions. Even though CodeIgniter is fairly slim, it can be overkill if you've got something super simple. If you're going to work with a team of developers on a project of great size, you should probably have a long discussion regarding the framework to use. Otherwise, if it's your choice, try a few and do what you want. Forget about what everyone else says.

Expert Website Development - Temecula, CA
Community Auth For CodeIgniter 3