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/Program.cs

using System;
using Newtonsoft.Json;
using System.Collections.Generic;

public class Program
{
	public static void Main()
	{
		var json = @"[
	    {   
	        ""cuid"":""1338857734894"",
	        ""invitationStatus"":""invite_accepted"",
	        ""isEnabled"":true,
	        ""userProperties"":
	        {
		""name"":
	            {
			""familyName"":""Smith"",
	                ""givenName"":""John""
	            },
	            ""email"":""[email protected]"",
	            ""mobile"":""(111) 333-4444"",
	            ""role"":""Developer"",
	            ""specialty"":""Development"",
	            ""department"":""IS""
	        }
	    }
	]";
		var root = JsonConvert.DeserializeObject<IEnumerable<RootObject>>(json);
		root.Dump();
	}

	public class Name
	{
		public string familyName
		{
			get;
			set;
		}

		public string givenName
		{
			get;
			set;
		}
	}

	public class UserProperties
	{
		public Name name
		{
			get;
			set;
		}

		public string email
		{
			get;
			set;
		}

		public string mobile
		{
			get;
			set;
		}

		public string role
		{
			get;
			set;
		}

		public string specialty
		{
			get;
			set;
		}

		public string department
		{
			get;
			set;
		}
	}

	public class RootObject
	{
		public string cuid
		{
			get;
			set;
		}

		public string invitationStatus
		{
			get;
			set;
		}

		public bool isEnabled
		{
			get;
			set;
		}

		public UserProperties userProperties
		{
			get;
			set;
		}
	}
}