try
{
    var contactManager = GetContactManager();
    var contact = contactManager.LoadContactReadOnly(contactId);
    if (contact == null)
    {
        Log.Info("MySite.Presentation.Controllers.CustomFieldsController.GetCustomFields: Contact not found!", this);
        throw new ContactNotFoundException();
    }
    var customFacet = contact.GetFacet<IContactCompanyInfo>(ContactCompanyInfo.FACET_NAME);
    Log.Info("MySite.Presentation.Controllers.CustomFieldsController.GetCustomFields: Company: " + customFacet.Company + " Industry: " + customFacet.Industry + " Sub Industry: " + customFacet.SubIndustry + " Revenue Range: " + customFacet.RevenueRange, this);
    var serializerSettings = new JsonSerializerSettings
    {
        ContractResolver = new XdbJsonContractResolver(client.Model, serializeFacets: true, serializeContactInteractions: true),
        DateTimeZoneHandling = DateTimeZoneHandling.Utc,
        DefaultValueHandling = DefaultValueHandling.Ignore
    };
    return Newtonsoft.Json.Linq.JObject.Parse(JsonConvert.SerializeObject(customFacet, serializerSettings));
}
catch (ContactNotFoundException ex)
{
    Log.Error("MySite.Presentation.Controllers.CustomFieldsController.GetCustomFields", ex, this);
    return Request.CreateResponse(HttpStatusCode.NotFound, ex.Message);
}