I am skilled in using Javascript (and Typescript) in both back-end (NodeJS) and front-end (React and Next.js). I have experience developing a schedule application for a barbershop (GoBarber) using React for the front end and Node JS for the backend. I have used PostgreSQL and MongoDB for storing data, and also Redis for cache. I have also built a online find and schedule medical exams application for my own startup (Heali) using Next.js for the front-end and Node JS for the backend. I have used PostgreSQL and MongoDB for storing data, and also Redis for cache and background jobs queue. I have integrated with Amazon S3, Google Maps API, Facebook and Google OAuth.