Simple logo design

I am looking to create a new logo for my website. The website is an energy jobs site and needs a relatively simple clean cut logo. I would suggest doing it in blue, and white. .

I will need you to show me previous work you have done before I commission this. I will also need it within 7 days and expect to be able to see the logo before signing it off and paying the remaining balance. Please send me a link to your portfolio, it is likely that I would want to pick something similar to what you have done before.