On a mobile chat app project an experienced developer constantly creates conflict and other team members refuse to work with them. The developer is a high performer and losing them could hurt project goals. What should the project manager do?

The best approach is to meet individually with team members and the developer to understand the root causes of the conflict and then develop a tailored action plan. This allows for a comprehensive understanding of perspectives without immediate confrontation, fostering a more constructive resolution. Simply asking the developer to be respectful is unlikely to resolve underlying issues. Sending the problem to HR without attempting to resolve it internally first abdicates the project manager's responsibility and may escalate the situation unnecessarily. Team-building training might be a component of a solution, but it's premature and ineffective without first understanding the specific interpersonal dynamics and conflicts at play.