Include concrete examples of communication and leadership skills with impact statements.
You should be wary of including soft skills directly on a resume. While you may be tempted to say you’re a good communicator or a team player, those things are not easily demonstrable and often dependent on context. Instead, you should follow the example of this resume: the senior Java developer is responsible for translating technical data to non-technical team members (specifically the COO), and they provided supporting impact data to demonstrate how effective they were in that context.