iOS (iPhone & iPad) skills:
Game development - Cocos2D:
- using Composition and keeping inheritance hierarchy to as few levels as possible,
- using SneakyInput opensource joypad (movement and shooting),
- moving background with simulated 3D perspective (Parallax scrolling, extension class to enable infinite scrolling),
- CCSpriteBatchNode for optimised graphics, TexturePacker - texture atlas tool,
- inputLayer, MVC architecture

Some interesting features:
More information - next week.

OpenGL ES skills:
More information - next week.