Combat system

I need a developer experienced in designing turn-based combat systems, preferably for multiplayer games. While the exact mechanics have not been specified, familiarity with action point systems, sequential order combat, or player vs. environment interactions would be advantageous. The system required will cater to multiple players. Your expertise should allow you to direct me in choosing the appropriate mechanics for the best gameplay experience. Please provide examples of past relevant work. Delivery timeline and milestones can be discussed once the project starts.