San Francisco, CA
Square (<a href="https://squareup.com/jobs" >https://squareup.com/jobs</a>)
We're going to change the way people pay. We've got some big backers (<a href="http://www.crunchbase.com/company/square" >http://www.crunchbase.com/company/square</a>), a bunch of really smart people and a product that people absolutely love.
Email me (zach -at- squareup.com), or apply through the site if you're interested.
Ask HN: Who is Hiring? (May 2011)