A few years ago, I gave a talk at the SFRails meetup. It was by far the largest group I've spoken to and a truly enjoyable experience. I titled the talk "Leveling Up Rails Developers," and it was geared towards helping engineers build a team which fosters learning and advancement of skills.
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Fostering a learning culture
One of the major issues in the Bay I've been interested in lately has been getting more junior engineers into the industry.