- difference between MySQL and PostgreSQL, stored procedures - explain inheritance - describe adapter patter/ singleton - advantages and disadvantages of ORM - dependency injection (what it is, pros/cons) - explain/experience with docker (how do you pass env vars into container),docker-compose yaml - circuit breaker - Go questions: array vs slice, stale slices, memory leaks Solve problem: You have more requests coming in that is a rate of database cluster write. Propose solutions