Create Online Job Marketplace Web app

We're looking to create web application on which employers can hire freelancers.

Required features:
- Employer portal
- Freelancer portal
- Chat ability
- Feedback & review functionality for freelancers and employers
- Payment functionality like escrow, release, etc
- Support tickets from clients to staff

Expected timeline: 12 weeks

Please provide the following in your proposals:
- Timeline
- Total breakdown on Timeline and Cost with details on what phases you would approach the project