React firebase signup verify if USERNAME exists

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I am a Fullstack Software engineer with 7+ years’ experience in the Information Technology field. Specialized in open source technologies such as PHP and Javascript focused on practical things than theories. Have engaged in lots of activities in a SDLC such as requirement gathering and analyzing, designing, development, testing, implementation and maintenance. Also having experience in hardware and networking with both windows and Linux environment. Self-learner with good analytical and problem solving skills. I can exposure to new technologies easily. I am not bothered keeping all things in my mind until GOOGLE is there. 

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