Title: It could be a tool that you have created, a process that you have started or anything else which created a big and lasting impact on your workplace.<p>For me, it was probably starting holding regular tech book review sessions.<p>Over time the discussion around both architecture and implementation details got way more structured, quicker and more satisfying to all parties. 
Seems obvious, but building up mental model of software development through a structured approach is better than just letting it happen naturally during work hours.
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