Place the saltine crackers into a plastic bag and crush the crackers with a rolling pin (or a meat mallet) until finely ground. You can also use a food processer. Set aside.
In a small bowl, whisk together the egg, mayonnaise, dijon mustard, lemon juice, Worcestershire sauce, Old Bay seasoning, salt, and pepper.
Add the jumbo lump crab meat on top, followed by the cracker crumbs. Using a rubber spatula, gently fold the mixture together until just combined. It is important to do this step very carefully because you do not want to break up the jumbo lump crab meat!
Using a 1/2 measuring cup, carefully scoop the crab mixture into (5 - 6) perfectly shaped crab cakes. Place the crab cakes on a plate or baking sheet and cover them with plastic wrap. Refrigerate for at least 30 minutes.
In a large nonstick pan, heat 2 tablespoons of butter over medium heat. Once melted, cook the crab cakes for 4 - 5 minutes or until golden brown. Carefully flip the crab cake, add the last tablespoon of butter and cook for another 4 - 5 minutes.
Serve immediately with a side of lemon wedges, tartar sauce, cocktail sauce, or on a butter bun for a crab cake sandwich.