Hello,
i'm experienced C++ and OpenGL developer. I've coded numerous number of effects. I know latest tech used in example Crysis 3 or Watch Dogs. I've coded before shadow mapping in various implementation(pure shadow maps, PCF filtering, Soft Shadows Maps, Cascaded Shadow Maps, Variance Shadow Maps, Exponetional Shadow Maps, even Fixed-pipeline shadow maps).
Check my portfolio for screenshots.
If you need to see more examples i'll send them to you.
Best Regards