I haven't written smart contracts. But I have written two new programming languages, one of which can guarantee security of smart contracts due to a novel feature no language has. I didn't attempt to apply the language to smart contracts.
Once implemented encrypted search, based on a paper I found that described it.
I have strong background in automation, tend to automate my job away, and to produce results in the range of 10x-1000x+.
I have very little background in financial products.
I wrote tools that pull data from exchanges and run 20+ analyses on them. Then systematically backtested combinations of custom trading strategies to prove a consistent strategy across all markets.
I'm entertaining a couple of ideas around new blockchains that I can't disclose at the moment.