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I just received an offer from a startup, say A and it is pretty good, the only downside is that I will be the only developer there (as of now) as most of the work is outsourced. The work will be handled by the in-house team later whenever strength is good. Meanwhile, I am also in talks with two more startups, which I prefer more as the package is also better in both, along with the fact that I will be working on a new technology than what I have been till now. I want to go towards learning a new language/tech, working in a team and a nice package, which will be given by both B and C.
At B, I am yet to be interviewed for the second round and the results will take a week at least. At C, again I am yet to be interviewed by them, but it is by far the best of all. Again, C will also require at least one week.
Now I'm kind of stuck, I also have to relocate to that city where all three startups are located (which is the same city), and just received a communication from A asking me to join ASAP.
What is the best way to convey to them that I need a week to confirm the offer? I do not want to deceive them by saying yes right now and then turning my back towards them if I am accepted by either B or C. Any help?
EDIT: I do realize that a question somewhat like this might have been answered. I just could not find one that could exactly relate to this situation, hence thought of asking this. As A, B and C are startups, each and every hiring is an important thing to them. Hence, I don't want to waste the time of A also by lieing.
EDIT 2: I did see the related question. It is kind of the same, but the situations are actually different. In that, the OP applied to all three at the same time, I didn't. Here I'm involved in startups, a real quick decision is necessary in this case, hence even asking for a week sounds like kind of a risk to me. In the related question, the user is primarily asking as to how to speed up the process at C while having A and B ready to hire him, in my case I wish to keep A as a backup in case either B or C don't select me. I do believe this should stay as a different question.