Toronto - 500px - backend, front end, android, iOS, senior sys admin, UX designers.
Core app: rails with clustered MySQL and mongodb, looking at moving to riak soon. Some components in other languages (c, c++) data mining python + scipy. Backbone JS for rewrite of front end. Salary between 60k and 100k, options worth 0.25% and 0.75% office location currently near King and Peter, might be moving to liberty village soon though.
Massive traffic, good revenue, sustainable business and culture. Email me (info in profile).