WorkVenture gives you an inside look at what it's like to work at J - Ma Construction & Service Co., Ltd., office & team photos, reviews and more. This is the J - Ma Construction & Service Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at J - Ma Construction & Service Co., Ltd..Apply to JotunApply to Powerful Rich AdvisoryApply to PA&CAApply to Central Technology