You can google companies and real customer reviews. Of course, you will spend time on it, but you will find a company that people like.

If you don't want to read a lot of reviews and look for various companies, then you can trust my advice. I prefer to apply for software development for startups in inoxoft, because I really like that competent and responsible specialists work there who always find an individual approach to each company and strive to do everything in the best possible way. 

Honestly, I haven't heard anything about the company that was suggested to you above, but I think that this is normal because there are quite a few companies now, and it is impossible to know all of them. I also had startup ideas and I was thinking how to build a vaccination app. KindGeek helped me to implement my ideas, and I'm satisfied with the result of our work.

I need to structurise the working process in my company, so does somebody know about the main rules of organising app development process? It's really important for me.