The principal function of an developer is to make specific tasks, based on the business's specifications: Core T24, Middleware System (ESB, Integration, Payemnt Gateway), Card (Way4), ECM/BPM, UIUX…
Establishing a detailed program specification through discussion with Business/System Analysist even Business team.
Doing unit test and make the release note document
Make the deploy package to implement into other environment (test, pilot, production) and check list to deployment