General Assembly - they teach front and back end which may be great in job market but also may be overwhelming in class. 3 months is a short amount of time.
Iron Yard - focuses on front end only but I feel that will be a narrow skill set in the marketplace.
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Check the reviews out for both the courses first. I have heard many bad things about the curriculum and instructors at both of those schools.
Maybe check out Maker Square in Austin.