Application & data
Ruby, JavaScript, NodeJs, Tomcat, Nginx, HaProxy, MongoDB, RabbitMQ, Redis, ElasticSearch, Amazon Web Services (EC2, RDS, CloudFront, S3, etc.), scala, Haoop, Spark, SparkML, Kinesis, Kafka, Airflow, Javascript, HTML, CSS, Node.js, Vue.js, React, React Native, Kotlin, Java, Swift