Pros
I joined Rallyteam in 2015, and thus far, it is a blast. I can tell for sure that this is the most comfortable and empowering environment I ever worked in . - Excellent opportunities for personal growth - Amazing team, everyone is here to help you - Opportunities to work on any part of the system and be mentored by humble gurus in each field - Ability to learn from the best and live the real start-up life - Work on real problems that impact many users and organizations - Quarterly off-sites with biking/hiking/running challenges As an engineer you also get be exposed to business side of the company, which I found amazing, since that gives you a better understanding of how things you work on impact the direction and progress of the company as a whole.
Cons
Startup life implies that development needs to move at the speed of light, which., sometimes, translates to tight deadlines.