We expect that the amount of effort to do any of these exercises is in the range of about 4-6 hours of actual work. We also understand that your time is valuable, and in anyone's busy schedule that constitutes a fairly substantial chunk of time, so we really appreciate any effort you put in to helping us build a solid team.
Keep it simple. Really. 4-6 hours isn't a lot of time and we really don't want you spending too much more time on it than that.
Treat it like production code. That is, develop your software in the same way that you would for any code that is intended to be deployed to production. These may be toy exercises, but we really would like to get an idea of how you build code on a day-to-day basis.
You can do this however you see fit - you can email us a tarball, a pointer to download your code from somewhere or just a link to a source control repository. Make sure your submission includes a README, documenting any assumptions, simplifications and/or choices you made, as well as a short description of how to run the code and/or tests. Finally, to help us review your code, please split your commit history in sensible chunks (at least separate the initial provided code from your personal additions).
The complete specification for this exercise can be found in the junior-challenge.md.
The complete specification for this exercise can be found in the UsersAPI.md.
The complete specification for this exercise can be found in the Forex.md.
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Is it OK to share your solutions publicly? Yes, the questions are not prescriptive, the process and discussion around the code is the valuable part. You do the work, you own the code. Given we are asking you to give up your time, it is entirely reasonable for you to keep and use your solution as you see fit.
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Should I do X? For any value of X, it is up to you, we intentionally leave the problem a little open-ended and will leave it up to you to provide us with what you see as important. Just remember the rough time frame of the project. If it is going to take you a couple of days, it isn't essential.
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Something is ambiguous, and I don't know what to do? The first thing is: don't get stuck. We really don't want to trip you up intentionally, we are just attempting to see how you approach problems. That said, there are intentional ambiguities in the specifications, mainly to see how you fill in those gaps, and how you make design choices. If you really feel stuck, our first preference is for you to make a decision and document it with your submission - in this case there is really no wrong answer. If you feel it is not possible to do this, just send us an email and we will try to clarify or correct the question for you.
Cheers!