My friend works at a US based company.

[tufguy]

My friend works at a US based outsourced company that deals in medical claims. He does night shifts. He has been working in night shifts for the last six years. He doesn't want to do day shifts.

Please check.

 

[emsr2d2]

My friend works at a US​-based outsourced company that deals in medical claims. He does night shifts. He has been working [STRIKE]in[/STRIKE] night shifts for the last six years. He doesn't want to do day shifts.

Please check.

See above.

 

[Tdol]

Outsourced or outsourcing?