Wanted - Electronic and Motor jet engineer to help complete a jet board

I am looking for a very smart and clued up technical engineer who can help me complete a small jet board. The engineer should have a very good understanding of motors, battery, waterproofing and some electronic controller skills. We trying to improve on a board that will be used in the sea and keeps seizing up. A few changes are needed and need to add possibly another motor and a more powerful battery supply. most important make it kid and teen proof…!