WorkVenture gives you an inside look at what it's like to work at Sigma Specialist Service Co., Ltd., office & team photos, reviews and more. This is the Sigma Specialist Service Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at Sigma Specialist Service Co., Ltd..Apply to CrystalrelaxApply to LH MallApply to MintedimagesApply to Siam Organic