Using PowerShell, start background jobs on multiple servers at the same time and wait until they finish.

StartJob.ps1

#Purpose: Start background jobs on multiple servers at the same time and wait until they finish

$servers = "server1","server2","server3"
$buildNumber = "1.2"

$servers | %{    
    $script = 
        {
            param($server)
            Invoke-Command -ComputerName $server -ScriptBlock {param($buildNumber) New-Item c:\Deployment\$buildNumber -type directory -force} 
            Invoke-Command -ComputerName $server -ScriptBlock {param($server) Start-Process -Wait -Filepath "C:\Deployment\Deployment_Script.exe"  -RedirectStandardOutput "c:\deployment\output_$server.txt"} -Args $server 
        }
    Start-Job $script -ArgumentList $_ #refers to the $server variable
    }

While(Get-Job -State "Running"){Start-Sleep 30}