A quick breakdown from my recent experience hiring for 5 software developer positions.

Entry Level Engineers - Easy to find but expensive to train

Mid level engineers - Difficult to find but minimal training required

Senior engineers - Extremely difficult to hire almost no training required

For a software team to be successful you need at minimum a strong mid level to keep everyone moving in the right direction but it's preferable to have a senior level engineer.

I'd recommend everyone heavily invest in growing the people they have instead of playing the 'lets hire a senior lottery'.