There are a few things that need to be acceptable for this kind of behaviors, IMO: 1. The enginner needs to produce a certain level of acceptable quality and i

There are a few things that need to be acceptable for this kind of behaviors, IMO: 1. The enginner needs to produce a certain level of acceptable quality and in timely manner. 2. The engineer wants to participate in activities that ensures quality. E.g. code review, pull request, etc. 3. Related to point 1 and 2, cutting corners and dumping work to his/her coworkers are so not acceptable. Clearly, the engineer has extra time. I could care less about corporate loyalty, but the engineer needs to satisfy a certain level of SLA at the primary day job. Almost all daylighters I've seen ruins team chemistry because he/she didn't really hide the side activities AND actually perform less than average, causing the rest of the team to feel salty.