Backend:Java, Scala, Python, Go, Rust, NodeJSFrontend:ReactJSApp:Kotlin (Android), Swift(iOS)IAAS:AWSDBs:MySQL, Postgres, ScyllaDBCaches:Redis, AerospikeMessage brokers:Kafka, RabbitmqServiceMesh:Kubernetes ecosystem, Mesos, ConsulLoad balancing:Haproxy, KongData platform:S3, Presto, Druid, Snowflake, Flume, Flink, Hive, Spark, StormSearch:Solr, ElasticsearchCI/CD:Custom built tool over JenkinsMonitoring:Thanos (by improbable), NewRelic (APM), Custom analytics systems built in-house