What are the top job search portals or websites in Singapore?

Technically, a job search portal is a website.

• https://www.mycareersfuture.sg/

• Linkedin

• Indeed

• Jobstreet

• TalentTribe​​​

Hello, hope this helps!
General Sites

• https://sg.wantedly.com
• https://www.linkedin.com/jobs/
• https://www.indeed.com.sg
• https://www.glassdoor.sg

Start ups:

• https://angel.co/singapore/jobs
• https://www.techinasia.com/jobs/search?country_name[]=Singapore
• https://startupjobs.asia

Others & Exotic Options (haha)

• IG Posts (common for media related companies)
• https://www.workaway.info
• https://wwoofinternational.org
• apply for a NZ visa (if you're under 30) and work there for 6 mths because the min wage is ~15 sgd/hr!!