You can pay only for work you approve in these type of sites.
For fixed price jobs, simply deposit funds in their licensed escrow
and your worker will be paid when milestones are met.
For hourly jobs, use their Work Tools to approve work.
Quick, simple, no trees harmed.
2, In order to avoid time waste,
you must define job qualifications clearly.
You'd better find skilled engineers.
Don't mind pay high price for them.
it is worth it!
For example:
Your qualifications:
- Programming languages: XXX
- A work style that is extremely detail oriented
- A complete engineer profile
- References or an established reputation on witkey sites preferred