Do you speak Singlish during job interviews?

Genuine question for Singaporeans here.

When you go for job interviews, especially for senior or international roles, do you consciously switch to professional English, or do you just speak with Singlish?

I recently interviewed three candidates for a fairly senior marketing position with international scope. One had 20+ years of international experience, one came from an agency background, and another from an international MNC with about 8 years of experience.

To my surprise, all three spoke quite a bit of Singlish during the interview. Even during simple opening small talk:

Me: “Did you come from your workplace? Did you take time off to attend the interview?”

Candidate: “Ya ya ya, I came from my work.”

It wasn’t just one off moments. Throughout the interview, every other sentence had a “lor” or “lah”, and it sounded rather unprofessional.

Curious to hear Singaporeans’ perspectives on whether they think this is okay or not, and whether people are self aware of how they present themselves at interviews.