Making an API backend and integrate the frontend (the code is exist), the API backend and the server backend

Request: 1. I would like to have someone to make a RESTful API backend
2. And integrate a), b), c) and d) below to make the website and the backend run independently by running our own API and backend server
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The information / code I have now:
a) API guide: https://docs.agora.xyz/guild/
b) I have the following frontend code: https://github.com/agoraxyz/guild.xyz
c) Telegram bot: https://github.com/agoraxyz/telegram-runner
d) Discord bot: https://github.com/agoraxyz/discord-runner