Working for small companies. They tend to invent new things, instead of trying to leverage existing off-the-shelf products into synergy, and other market-speak that just means they put libraries together and call it a product.

There's plenty of untapped stuff out there, and some fields are so crazy about business logic that there's no way to re-use anyone else's, so you have to write it yourself.

I also develop random things that suit my fancy in my free time.

I have yet to feel like I was just putting Lego blocks together.