To prepare the Dijon vinaigrette: Combine all the ingredients in a jar, seal, and shake well.
To prepare the salad ingredients: Fill a medium sized pot with water, season with salt, and place over high heat. When the water starts to boil, carefully add the potatoes. Boil the potatoes for about 25 minutes or until fork tender. Using a straining spoon, remove the boiled potatoes from the pot and set aside in a dish.
To plate the salad: Add the salad greens to a large mixing bowl and toss the salad with the Dijon vinaigrette. Reserve some of the dressing for the remaining salad ingredients. Place the salad greens into two bowls to form the base of the salad. In batches using the same mixing bowl, dress the green beans, potatoes, tomatoes and olives. Equally portion out the salad ingredients between the two bowls. Finally top the salad with salmon and egg wedges.