I guess I'd have to rent first from another real state agency like Sakura House or another who's more foreign friendly and has less strict conditions (other than having the money ready to pay) for a few months until I'm lucky in an interview to get a job.
Currently I've the funds to live on my own for several months there, but the language is a big barrier for me. I do know every hiragana, katakana and some kanji's and vocabulary/common phrases to survive though. It's a kind of vicious cycle that you've to have a job to apply for renting an appartment even if you've the money to pay some months. Well, that's actually how it works in many countries. ┐·_·┌
I'll have to see in some years in the future if I'm able to master the language and if I can keep the same economic position I've now to execute that plan. There are educational establishments in my country that teach "professional" japanese in 4 years which are very price friendly but I don't know if that'll work
IDK how things are going there for IT professionals. I'm more on the development area (programming mostly as a senior developer. I've to get less rusty when making more management tasks like designing use cases, RFP's, User histories which I did on my last company but I was fired because they were outsourcing development).
I know a fair amount of japanese culture to fit in their society, but being a gaijin might be a problem if I don't have the contacts to get a job. I don't mind if that means constant hard work since in my country I get paid less much than in Japan with about the same amount of work and with the constant concern for crimes and shitty culture that floods Chile (i.e: If you scam somebody you're considered a genius instead of a criminal, even in small scale like not giving the right change when paying, not returning a missing wallet, stealing bikes parked in the street, etc.)
That's why I love Japan's culture so much. You've to just focus on your work without other 3rd-world worries