After completing a short-term certification course, am I eligible to search for a job and start working in that country in UK for a Bachelor's/Master's?

It depends. Most countries, including the UK, do not grant post-study work rights after a short-term certification course.

- In the UK, the Graduate Route (post-study work visa) is only available if you complete an eligible degree-level program (Bachelor’s, Master’s, or PhD).
- Short-term certification courses typically do not qualify for this visa.
- To work after a short-term course, you would need to secure a separate work visa or employer sponsorship.