YMGI Group. 601 Arrow Lane. O’Fallon, MO 63366. Email Applications Cover Letter, Last Salary/Working Hours, References and Resume to: hr@ymgigroup.com. CRM Marketing Manager. Job location: O’fallon, MO. SUMMARY. To cope with business expansion in residential segment of HVAC equipment market, a technical driven online E commerce marketing specialist is essential to address market needs and offer strategies with solutions. RESPONSIBILITIES AND DUTI...