Earlier quoted context omitted.
Where are you getting 13.3%? Most likely a software developer is going to be in the 9.3% bracket. And it is also a graduated bracket system so you are only paying that 9.3% on income over $51K. See https://smartasset.com/taxes/california-tax-calculator On a $150K income you are going to be paying an effective rate for CA around 7%.
You're omitting MediCal. It ends up being about 13% (marginal) after it is added.
Not sure what MediCal is. You mean Medicare? That's federal.
CA OASDI/EE is 0.9% but you only pay it on the first $100K or so.