As a junior backend developer I built a scalable nodejs app where i used cluster to take benefits from multi threading features, I used nestjs with fastify to provide high performance with Graphql to make my endpoints in single route which improve request time already, i used postgres with typeorm and redis to deal with mutations queries and caching, i used also subscription which is a feature in graphql to give real chat time to send and recieve messgaes, i localized my app to send multi lang messages using i18-nestjs, i wanted secure app so i used jwt passportjs for my authentication and with role based for my authorization , actually my app was contain REST endpoint also where i was uploading images to s3 by REST endpoint and i tested this by swagger, i deployed my app to aws using this services elasticBeanStalk ec2 s3 IAm codeCommit codePipline RDS elasticCache , it was competitive project and i ready to make harder ones.