I am a Senior Software Developer at Famcon Developers Group and a Software Engineer at Ethiopian Electric Utility. In practice that means the work spans the whole system: the schema and its migrations, the API over them, the web interface, the mobile client where there is one, and the server it ships to.
The work below runs across agriculture, energy, commerce and pharmacy. The OACF platform serves 66 cooperative unions and over 5,400 primary cooperatives across the Oromia Regional State. The TopMera applications put a commerce, pharmacy, grocery and parcel-delivery business on Android. The two EEU systems cover planned outages and power-distribution management for the state utility, where the data model carries the weight: regions, substations and feeder lines, with access control that has to agree with all three.