Problem
Design a caching layer for a mobile application that frequently queries slow, unpredictable external government databases for Propel.
Practicing as: Software Engineer interview at PropelHi, I'll play your Propel interviewer for the Software Engineer role. Candidates describe these interviews as often stressful and moderately difficult, so expect me to be direct and to the point. Take your time with the question above and answer like we're in the room.
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