Hi, I have experience in developing addons for google docs, sheet and Microsoft word, I have worked with google app script and also latest javascript framework to build google sheet and google docs addon and deploy it using clasp, i can also develop addon for microsoft, word and microsoft excel, I have experience in working on web related technologies for over 6 years, i have worked on Google Addons, MS Office Addons, Google/Firefox extensions. I have worked on Javascript, typescript, flow, es6/es7 babel, angular, react, vue, jquery, backbone and other javascript libraries and framework, i have already completed some task here on freelancer, I can complete your google sheets addon quickly as per your requirements.