Cartonization Software

We seek a Freelancer with efficient cartonization software. We'll provide data--Orders with 3D Items and Cartons. The software will select feasible cartons. Aside from the many combinations the cartonization problem is simple--all Items are rigid 3D cubes that can be placed anywhere, next to any other Item. We will make many runs. Fast turnaround is important. Best would be our ability to execute. Please specifiy how efficient your algorithm is.