Do you need both Netflix and Prime? Small savings, but they seem redundant.
Are you reimbursed when you travel for work?
The expenses - are they combined for you and your GF? $150 per month for groceries is really low for two people.
You didn't write a full case study, but I want to point out you are missing many spending categories. You have nothing for house maintenance, car repairs, household supplies, clothing, etc. Also, I saw in a different thread that you and your GF are expecting a child soon so your expenses will change.
Honestly, it looks like your best opportunity to speed up your time to FIRE is through increased income.