[ninethirty]

You are resentful because you feel like you got lied to and are continuously being taken advantage of -- and there's nothing anyone can do because of inhuman "processes". You could radically adjust your attitude so you don't feel that way and have gratitude that you're not working in a coal mine, or start interviewing -- probably you should do both, adjust your attitude so your life is less miserable, and start interviewing. But why dwell on senior vs junior, isn't the relevant unit of account $$/year?

If Sunday morning all you can think about is how horrible Monday will be, and it gives you loads of anxiety, then you are burning out and you prolly need to quit -- you'll figure something out.