Qualifications improve your chances; they do not gate the job. Level 4 is the most recognised.
Level 4 most recognisedOpen entry
Your route in
Employers typically expect around L3
1
Qualifications employers recognise (Level 4)
Any of these strengthens your application.
2
Where this can take you
Occupationally competent assessor (Level 3 Assessor / TAQA) to Level 4 Award in IQA, then Level 4 Certificate in Leading the IQA of assessment.