There are negative reviews here on glassdoor and I respect others opinions however it is obvious many have an axe to grind and this is an easy anonymous forum to do so... personal attacks in my opinion show ones own underdeveloped character.
The truth is not so simple, real startups (of which I have been involved in multiple) that actually go somewhere and have successful exits require flexibility, a certain type of work ethic, a sense of urgency and individuals who have grit and persistence no matter what the challenges are.
This isn't always an easy place to work. No Where is, however the payoff at Intiva is potentially life changing.