Information about organizational culture and interviewing process may be gleaned from news articles, trade publications, interviews, blog postings, personal interviews with company's current or former employees, and more.
Start with Google or other search engines. Suggested keywords: organization name employee reviews OR complaints; organization name interview
Review company's websites focusing on investors' and About pages.
For public companies, you may also review review 10K, 10Q, and earnings conference call transcripts.
Follow up with these sources: