I want to work as a remote full stack junior developer . But is there anyone who can give me some advice in which way I should prepare my self . Or what is the best way to get it .
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I do not agree with the comments. I've been working remotely for the past 3 years doing multiple lines of work ranging from full-stack developer to project management to devops. Certifications are often overlooked, same goes for schooling. There is one, and only one thing that will get you anywhere, experience. Experience can be validated in 2 forms, a portfolio or a customer testimonials/reviews. Many online market places Upwork(formerly oDesk), freelancer, elance, etc. have a review system for customers to provide feedback. This has been a great source of work for me alone.
You may need some initial small projects to find a client. For this I recommend making a blog or personal website, contributing to open source, and creating an online presence. Things people actually look at are you profile on the freelance market, linkedin, and if you're being hired by a company that often hires developers they sometimes look at your github. If you have github contributions its best to provide a detailed description of those contributions, because many people don't know what github is or how to use it. Once you have a portfolio then try bidding on some small, short-term, fixed-budget projects. From there your portfolio will expand as your work, and you're customers will build trust for future clients.
Don't expect to land a comfortable job working from home right away, and don't expect it to be easy working from home. The first year was hell for me. It's hard to get in the routine of working your own hours. Working from home isn't as great as many people describe it, nor is working for yourself. You will end up paying more in taxes, and your taxes will not be taken out of your paychecks like when you're employed. You will either need to pay state and federal taxes out of what you earn either quarterly or yearly. And you will end up paying more in taxes than you normally would because the taxes become entirely your responsibility rather than the company you work for paying a portion of your taxes. Given this only applies to the US(talk to an accountant for more specific information). Its only for some people.
As far as certifications they are only worth it if your doing so to learn something. As far as increasing your ability to find work, they are useless. Same applies for schooling. The key is to keep learning every single day in which ever way works best for you, and the only way a potential client will trust your abilities is experience. A certificate doesn't mean your proficient, it just means you learned something, and in my opinion its part of the job title to be constantly learning.
Following this ideology has led me to be a top rated freelancer on Upwork.