Fix server issue for my Time Tracker app (NodeJS, MongoDB, Heroku)

I am looking for an experienced NodeJS developer to fix a database connection issue on my Time Tracker app. I have all the necessary documentation and log files available to diagnose the issue. This needs to be fixed within the next 3 days. Knowledge of MongoDB, Heroku is a must. If you can address this issue quickly and efficiently, please get in touch. Further details can be found here: https://docs.google.com/document/d/1hR8SMn2Cgpzt3tkDRZDarj-LbtWKtevTrSuNyvlY5WU/edit?pli=1#heading=h.sl1cg27umlip