Prós
Working for RallyUp has been a very positive experience. Coming from a company with a very inorganic and forced corporate culture, working here felt like a breath of fresh air. The atmosphere is collaborative and the dress-code is comfortable. New ideas and opinions are always welcome. You are given a good balance of autonomy and guidance in everyday tasks, and they encourage independent learning on a daily basis. You also get all the perks of working for a nonprofit, like feeling you are contributing your time and effort to a good cause, while working for a startup. If you like small work environments, this will be a great fit for you. You also have the added benefit of seeing your efforts translate into reality on a regular basis because your suggestions and opinions matter.
Contras
Meetings are very flexible and moved often to accommodate more pressing items. If you are a strict planner, this might be an initial challenge for you, but it is a normal part of startup culture.
Because the culture is so organic and unforced, this can have a side effect of an expectations gap when you start. Ask questions and get a sense for the everyday expectations (when to arrive, dress code, general office policies). If you come from a larger organization, it might not occur to you to ask. Everyone is happy to help you get acclimated to working here.