Ask HN: Who is building “long lived” software?

As a web e-commerce developer, I'm tired of building software that feels like it has a lifespan of 6 months before the next framework/business model/org change comes along. Is anyone building software with a lifespan of greater than say 5 years? Would I need to get into hardware/embedded systems if I wanted to build something that was longer lasting? Any other developers that have made the switch?