Ukrainians have the right to work as soon as they arrive in the UK. You need to be 18-years-old to work full time.
To look for a job, you can use a free government website called Find a Job.
You can also find a job by registering with a recruitment agency or searching other job agency websites.
Employers must check that new employees are allowed to work for them in the UK before employing them. You will be able to use your Biometric Residence Permit as evidence of your immigration status in the UK, including your right to work.
To prove your status digitally to an employer you can use the online right to work service.