Actually Reliable Web Dev for eCom Stores

What exactly do you guys do? How does the optimization part work? What makes you better than others? How can I get in touch? How do you complete tasks so quickly? How do you ensure no changes break my site? What is outside of your scope? How long am I locked in for? What if I just want to complete a one-off project? How can I submit tasks? What does your analytics review include? What's your pricing?