I think you ask the wrong question. No technology you can pick up in three months will get you a job right away, much less a remote job. Coding bootcamps -- which have little credibility with hiring managers already -- last longer than that. You don't say what work experience you have or what you already know how to do. The only realistic answer: To get any job you need to leverage the skills you can demonstrate, with experience to back it up. In this market you also need good professional contacts, persistence, and luck.

Any technology you can pick up in three months that would secure a job "right away" would already have hundreds of thousands of people doing the same thing, competing for the same jobs. You won't find any shortcut or one weird trick no one else knows about to get a job.

You may have noticed the short supply of tech jobs right now, and lots of people looking for jobs because of waves of layoffs. And you may have read about many major employers, especially in the tech sector, reining in remote workers and enforcing return to office policies. Finding any job right now presents big challenges, and finding a remote job now will prove even more challenging.