As a programmer that can work with FOSS software, you have now much more employment options because frameworks/etc. are not proprietary to the company you work for, and you easily transfer your knowledge to another company. If your job is "now to glue free modules together" you are also most likely responsible for a bigger part of the product due to FOSS, which could give you a better position in salary negotiations.
FOSS also gives (not just, but more so than others) developers better non-employment options. As a freelancer, you can more or less choose your software stack and then go hunting for clients, without having to worry about licencing fees limiting your client base. As a founder, you can much more cheaply found a tech-company, because there is much smaller upfront investment necessary, and when started as a side-project can be as cheap as renting a server.
As a programmer that can work with FOSS software, you have now much more employment options because frameworks/etc. are not proprietary to the company you work for, and you easily transfer your knowledge to another company. If your job is "now to glue free modules together" you are also most likely responsible for a bigger part of the product due to FOSS, which could give you a better position in salary negotiations.
FOSS also gives (not just, but more so than others) developers better non-employment options. As a freelancer, you can more or less choose your software stack and then go hunting for clients, without having to worry about licencing fees limiting your client base. As a founder, you can much more cheaply found a tech-company, because there is much smaller upfront investment necessary, and when started as a side-project can be as cheap as renting a server.