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Glassdoor is not accurate

source?

Could be really depending on location.

Current Software Engineer, for full disclosure, pondering how to move away from the prevalent web dev job market where I currently reside. Data science seems to pay on par.

Depends on the company. I fought the senior engineering leadership and HR to get data scientists on the same scale as engineers (they had previously been lower--much lower).

Even if that's true, the OP was talking about mid level software engineers, so they would be leaving a field where they had 5 or so years of experience and moving into one where they had 0.