English to Portuguese Bus/Financial Human Resources

Estou em dúvida quanto à melhor tradução para essa palavra. Será que "vagas" cairia bem? E "contract placements"???? Essa palavra aparece diversas vezes no meu texto. Darei alguns exemplos abaixo:

1. The main driver for candidates in the Middle East is focused on hardship locations with most placements offered to those who are completely mobile and have a preference for rotational/contract roles.

2. For the downstream market, such as chemical and petro-chemical facilities, almost all engineering disciplines & project management specialist skills are highly in demand. 90% of contract placements sit at the high end of the earnings bracket, particularly for senior executive positions, whereas permanent salaries continue to be competitive due to the availability of local talent.

3. Local companies within the UAE have a preference for local talent, which accounts for approximately 10% of current placements.