That's not really latchkey's problem. It's different for big companies (Google, Microsoft etc.) that have to hire by truckloads, but small, startup companies (

That's not really latchkey's problem. It's different for big companies (Google, Microsoft etc.) that have to hire by truckloads, but small, startup companies (say, <40 people), only need to hire a couple of good people and therefore can be selective and therefore can use a filter that rejects "majority of people" (especially given that filter also strongly correlates with "people they wouldn't want to hire anyway"). Now, I'm not saying it's your problem, as you also need to be hired by only one of many companies so it's perfectly valid to ignore companies that have a strong preference for open-source contributions. However, if you do want to be considered by such companies, it's a small investment to build a portfolio of open-source code on github. I believe this is becoming more and more important because more and more startups are founded by people who grew up in a world where open-source projects and github are a norm, not some extraordinary event as it used to be just a few years ago.