[im_down_w_otp]

There's a vast, vast divide between people who can use Rails and people who can design and build Rails, and an even bigger divide between the people who can use AWS and people who can design and build AWS.

The company in the OP isn't in the business of systems engineering, they're in the business of software integration. I suspect if they were in the business of engineering they'd have a much different view of what it takes to be "senior". Because they'd be able to measure it in terms of lawsuits, audits, and fines rather than in slipped deadlines for web apps.