Job Descriptions and Profiles for Individuals by WDA - http://www.wda.gov.sg/content/wdawebsite/L101-ForIndividuals/L402-JobDescriptionforIndividuals.html
Job Description Information for employers by WDA - http://www.wda.gov.sg/content/wdawebsite/L102-ForEmployers/L226-JobDescriptionforEmployers.html
Jobs by Jobstreet - http://www.jobstreet.com.sg/en/job-search/job-vacancy.php
Sample Job Description Form by SME Toolkit singapore - http://singapore.smetoolkit.org/singapore/en/content/en/342/Sample-Job-Description-Form