WorkVenture gives you an inside look at what it's like to work at Hi-Ad Sign center Co., Ltd., office & team photos, reviews and more. This is the Hi-Ad Sign center Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at Hi-Ad Sign center Co., Ltd..Apply to Siam GemsApply to Thai ObayashiApply to Bangkok DusitApply to WorkVenture Technologies