Hi there,
I am very familiar with freelancer platform, being a member of this one for 10 years. I am in web development for 10+ years.
Obviously I can't include all the features that these platforms have due to limited budget, but I can develop a usable product where people could do work for money, bid, have ratings...
I could offer the following for the price I've bid:
1) user registration log in
2) post a job/project
3) browse projects by category (categories created in admin panel), search projects, filter by budget
4) bid on jobs
5) employer (user that posted the job) can start a chat with any of the bidders
6) employer can select the freelancer to work with
7) freelancer accepts/rejects the awarded project, if accepted the project starts
8) users have their balance on the site
9) users can withdraw funds to paypal or fund their balance from paypal
10) employer can create milestones for started projects
11) employer can release milestones
12) employer can mark the job as complete
13) employer and freelancers rate each other (5* rating and a text)
14) user profiles with their username, ratings, profile picture and about me (text)
This should be enough for the work to be realized between two parties. Let me know if you like what I proposed.
I would code this in PHP/MySQL (CodeIgniter framework), node.js (for a real time chat), JavaScript and Bootstrap 4 for a nice UI. All the code would be clean and well structured.
Regards,
Julijan