Dear mister/miss,
I would like to offer my application for such a job. I have years and years of experience with JS (JavaScript) so 'decoding' such a code wouldn't be an issue. If code is using any package, for example MongoDB; Sqlite3; Dotenv... etc. it will not be a problem either, I do have experience with them as well. I can guarantee clear and nice explanation, so after that you could write similar code using similar template, while being fully aware what You are doing!
Hopefully see you soon!
Red.