• Scala, Akka and Spray (which became Akka-Http) provided the building blocks for the menu service.
    Akka's actors and finite-state machine were a natural way to model a USSD menu (a series of stateful interactions between a subscriber and the USSD gateway).


  • I used Play to build a configuration UI for the service, which let you create and manage the menus (a hierarchical tree of options and actions).


  • I initially used MySQL as the database backend for the service. Thanks to JDBC (and some discipline), it was easy to swap in Oracle during deployment.


  • I used Redis to store subscriber preferences (such as language), for which a database would have been overkill.


  • Lightweight, no-fuss project management...just what the Doctor ordered :-)


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