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
Assessor (Level 3 Award in Assessing) then Level 4 Award in Internal Quality Assurance of Assessment then Level 4 Certificate in Leading IQA for the IQA manager/lead role.