Charge 80% of what the other company is charging and negotiate as a contractor to do the work instead, leaving your job as an enployee. Don't disclose that you'

Charge 80% of what the other company is charging and negotiate as a contractor to do the work instead, leaving your job as an enployee. Don't disclose that you've done it "already". All you've done is built a proof of concept. When you win the contract, rebuild it clean room style from memory and reap profits.