Create messaging experience on Telegram and Facebook Messenger

At LeanScience, we provide online diet consultation programs. A key part of this is monitoring our clients on a daily basis where they share their food logs, how they are feeling, any questions etc. All of our interactions happen using WhatsApp currently. We have no way to track or record this data. Also be able to record key parameters of how the client is feeling or how measurements are changing. The only way is to have a link to our website, where they will then fill up a Google form. We want to make this experience better, so they have an easy method to share this data, have a quick way to get all the key links and for us to be able to capture these logs too at the backend. We also want to be able to send messages at specific dates to specific people using a backend system. Telegram and Facebook Messenger offer multiple APIs and bots to be able to configure these. There are many 3rd party developers with solutions for these too. We are looking for someone to help build the above experiences on Telegram and Facebook Messenger (both).