Revise and rewrite employee contract

We are urgently needing professional contract writer to revise our current employment contract (Full-time employees and Part-time contractors). Employees are currently working from US, France, Germany, UK, Mexico, Brazil, UAE, Saudi Arabia, Korea, Japan, Australia and Phillipines.
Therefore, the contract must be re-write to meet a universal standards with room for editions based on different countries jurisdiction & labour law requirements.