Early-Stage App Growth Marketer

My mobile app is still in its pre-launch phase, so the very first task is to engineer a repeatable user-acquisition engine before we hit the stores. The single success metric for this engagement is new, qualified users, and everything we do must ladder up to that goal... (Budget: $15 - $25 USD, Jobs: Analytics, App Store Optimization, Content Marketing, Digital Marketing, Facebook Marketing, Internet Marketing, SEO, Social Media Marketing)