Optimizely is an ambitious startup; their primary office is in Cologne, Germany.
Currently, Marketing, Product Management, and Promotion And Marketing Communications are frequently searched for professions at Optimizely. They recruit for offices in San Francisco, CA, Austin, TX and 2 other locations. Optimizely at present has 13 job ads, for example "Growth/Lifecycle Marketing Manager" and "Senior Data Analyst".
On the web, the company is represented on Google Plus and Twitter, among others. If you are interested in the company's job ads, their careers page is a great starting point.