I am a web developer and sometimes I work in GIS Applications using ESRI products Such as ArcGIS Server (and previously ArcIMS).
I work in two companies, the one in the morning is pure Microsoft Windows, SQL Server and .NET Applications and the one in night is Pure Open source Linux, Python, Postgre SQL Applications, and I'm the Senior developer in both of them. Very Very Exhausting but I'm having fun and gaining many knowledge from the two fields