I'm twelve years out of college and I wrote a BTree for the first time since college this year. It'd been primarily CRUD up until this year, I've been with this job for upwards of six years, but it's been shifting into more hardcore data stream processing and I've been getting to write a lot of multithreaded high performance code utilizing cool things like hyperloglog's and cuckoo filters. It took twelve years but I'm finally getting to use a little of my comp-sci.