Essence of backend engineering
(a).Build System (b). Logging (c).Monitoring (d).Authentication And authorisation mechanism(Proxy and other api security thing) (d).Testing (e).Alerting System For customers as well as for teams (f). Load Management(Elastic Behaviour). (g).DB Management(easy to scale ,easy for migration). (h).Ticket management (I). Documentation of things so that effort can be minimized.