Sigma Infotech Home ›› Local Listings ›› NSW ›› Bella Vista ›› Sigma Infotech NSW Business Services Baulkham Hills, NSW 2154 Grace Alexa130-079-4402Fax: 130-079-4402https://www.sigmainfotech.com.au WEB DESIGN-AWARD WINNING WEBSITE DESIGN. Web Design to Grow Your Business Call 1300782023 for Free Consultation with our web designer, website developer specialising in providing high quality application development and website development services Sydney Australia.