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As a client, simply submit the details of your project. Relevant professionals will be informed of your proposal. Then these professionals partake in reverse auctions to ascertain who will complete the project and for how much. You then get to work with the lowest bid submitted.
As a contractor, you bid for any project you are comfortable to accomplish.
As a construction worker, you can browse for construction jobs in.

Thanks for the answer. Also my question was about that.

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