Forgive me if I get the details wrong and if this needs to be split up into multiple posts, but I'm very new to all of this. I'm 22, have ~60k non-emergency money saved up, and got a new job with ~100k/yr salary that lets me contribute up to 25k after tax to my 401k, which, if I did my research correctly, I can then transfer to a Roth IRA using the mega backdoor. So I'm considering living off my savings + whatever is left in my salary to completely max out my 401k + do the mega backdoor. Are there any unforeseen consequences to this that I'm not considering?
Additionally, I have one other big decision to make, which is buying vs. renting housing in Seattle. I'm being encouraged by family to buy, and it makes sense because I do plan on staying in the area for at least the next five years and they tell me my money won't be wasted on rent. However, I'm pretty sure just the down payment would kill any plans I have of doing the above 401k maxing.
Overall my, perhaps naive, line of thinking is that it's a no-brainer and the 401k maxing + mega backdoor is the right way to go. Am I wrong?