I've found project management qualifications to give the best ROI. I've done Prince 2 and Scrum. Although I've never had a job title of Project Manager or Scrum

I've found project management qualifications to give the best ROI. I've done Prince 2 and Scrum. Although I've never had a job title of Project Manager or Scrum Master, they've helped me get senior/lead developer jobs just because recruiters like to see those words on a CV.