Web Application Food + Geolocating20 hours coaching on hands

I build already the base of it but now coming to the end of it it gets many errors. As I am a beginner (one 1 year of experience) this is my first big project and would like to go to finish this project together with a more experienced developer. I guess are around 20 hours what we would need. I prefer a german speaker however in english is ok as well. It is a web application with 3 different user types: sellers, cooks and drivers.

You must sign a Intellectual Property Handover Agreement to work on this project.

So far there are about 8 html files for the webpage. One of it including getting the current geoposition of the sellers (I am using the official html5 codesnippet for it: https://www.tutorialrepublic.com/html-tutorial/html5-geolocation.php ) and publishing it on the map where costumers see the current positions of the sellers. Then I want to make use of twilio (send sms or whatsapp messages) or similar to send messages to the different user types depending on certain events.

There is one main python file which makes use of different packages and frameworks so far including (as I said I built already the base). I need someone with experience in those. Especially flask, flask_alchemy... postgresql:

from flask import Flask, render_template, request, redirect, url_for, jsonify, session, flash, send_from_directory
from werkzeug.security import generate_password_hash, check_password_hash
import sqlite3
import datetime
#from seller import Seller
from flask_login import UserMixin, login_user, LoginManager, login_required, current_user, logout_user
from sqlalchemy import engine
from flask_bootstrap import Bootstrap
from twilio.rest import Client
from flask_sqlalchemy import SQLAlchemy
import twilio