Compact Double-Layer PCB Design

I need a fresh PCB layout for a new consumer-electronics gadget I’m developing. The board has to stay as compact as possible while still accommodating a double-layer stack-up for tighter routing and reliable grounding... (Budget: $30 - $250 USD, Jobs: Circuit Design, Electrical Engineering, Electronic Design, Electronics, Mechanical Design, PCB Layout, Product Design, Prototyping)