I'm not a designer; I build systems that are functional, that will work today, tomorrow and in 5 years.
The skills to develop a bespoke internal system to enhance productivity should focus on pragmatic development rather than pixel perfection.
This involves extracting current business processes, analysing then building systems to remove waste, keeping head count low whilst allowing a company to grow.
Yes ... User Interface is important; but delivering cost-effective business benefit more so.