Relational DBs

postgresql, mysql, mariaDB, MS SQL, Oracle

#NoSQL DBs MongoDB RethinkDB CouchDB DynamoDB

DB Concepts

ORMs ACID Transactions N+1 problem db norrmalization indexes + how they work

Design/Development principles

SOLID KISS DRY YAGNI GOF design patterns domain driven design test driven dev

message brokers

RabbitMQ Kafka

#GraphQL apollo relay modern

#search engines elasticsearch solr