Pulled open requisitions from public job board endpoints across 72 tech companies to see what people are actually listing.

The interesting part is that practice words and concepts totally dwarf individual tech stacks. Scalability shows up in about 53 percent of postings, mentoring is in 47 percent, and distributed systems and system design sit right around 47 percent as well. Mentoring specifically surprised me because it's higher than Kubernetes at 31 percent, React at 21 percent, or TypeScript at 20 percent.

For languages, Python leads at 44.8 percent, followed by Java at 35.4 and Go at 31.1. Everything else drops off from there, with TypeScript, C++ and SQL sitting in the high teens. On the frontend side, React is in about one in five postings while Vue and Angular barely register around 3 percent. For cloud, AWS is at 41 percent and Kubernetes is at 30.

Sample skews heavily toward US tech companies.…