Developer to MVP of LinkedIn Employee Advocacy Platform

I am looking for a developer to help me create a MVP (Minimum Viable Product) of a SaaS-platform for an LinkedIn Advocacy Platform, where an admin can create LinkedIn Posts templates and the users can login in a pick wich posts they will share on their LinkedIn profile.

Developer Roadmap for the MVP:

The first version (Minimum Viable Product) needs to have the following functions:

1. Create account
2. Invite colleagues and let them sign up
3. Create posts with text and image
4. Let colleagues share posts

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DESCRIPTION
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1. Create account
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The admin user will create an account with LinkedIn OAuth 2.0.
The user wil go through a short setup to fill in Company Name and their company email address.

2. Invite colleagues and let them sign up
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The admin user can navigate to a tab called “Users” and create new users. When creating a new user, the admin simply types in the email address on the user.

The user will receive an email with a short message and a link to the signup page:

Hi,

[Admin first name] has invited you to PostFactory.
Please create your account here: [link].

When the user clicks on the link, they need to login with LinkedIn OAuth 2.0 and will be directed to the Dashboard.

3. Create posts with text and image
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The admin has a tab called “Posts” where it’s possible to create see all posts – both active and old.

The admin can create a new posts and will get a window with:

Text (paragraph field, max 3.000 char)
Image (upload field, max 3 mb)
Expiry Date (date field, pick via calendar)

A button called create will submit the post to the database.
The post will now show in “Active Posts”. When expired the post will show in “Old Posts”.

4. Let colleagues share posts
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Admins will in the start notify their users via an email.
The user can login and see all active posts. The user can click on the post and open it to either edit or post.

The user can change the text and also the images if needed.

When ready the user can press a button called “Post on LinkedIn” and the post will get posted on the user’s LinkedIn profile via LinkedIn OAuth 2.0.

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Can you develop this?
Please let me know the estimate for each of the four steps.