Just keep in mind something that another pointed out: startups are chaotic. You may have to wait a bit longer from them. My suggestion of 1-2 weeks is largely a

Just keep in mind something that another pointed out: startups are chaotic. You may have to wait a bit longer from them. My suggestion of 1-2 weeks is largely assuming a traditional work environment and HR department. That doesn't mean you cannot contact them after 2 weeks, but do not expect an answer.