We built the SMS & USSD connectivity for last week's launch in Kenya with Airtel [1] using http://github.com/praekelt/vumi. Happy to answer any questions about this, USSD isn't used as much and as such largely unknown outside of the majority world.
I should mention that 2I performance may be a little slow, depending on what kind of indices and queries you need. It's not hard to try it out and benchmark, though.
I went back to find specific things for you and couldn't. The idea of "tricky" "test" is off putting. Making me jump through hoops just for the "honor" of being a possible candidate.
Yeah, truth in that. I'm needing to write a couple more like this, this is the first one. Next one will be an job description for a DB guy with interest in databases in the broadest sense. Not sure how to go about that one yet.
I like the infographic idea, any other suggestions?
Also, why are you attempting to recruit people who are interested in a subject "in the broadest sense", as opposed to people who live and breath the damn thing?
Recruiting people of marginal interest and passing familiarity sounds like a recipe for mediocrity, imo.
Maybe my bad choice of words. In the "broadest sense" I meant that we're looking for a DB person who's interested in both relational DBs as well as the complete other side of the spectrum.
Still, I think a tongue in cheek infographic could be pretty cool as a job description. True, maybe not so much for databases.
[1]: http://thenextweb.com/insider/2013/10/25/wikimedia-foundatio...