That is the page where you find jobs for 18F, nothing there indicates anyone at 18F is not on the GS scale.
It's important to note that that is GS15, step 10, with the maximum locality adjustment (which I think is just Alaska but California is not far behind). GS15 step 1 is going to be $123k before any locality adjustment so still very likely under $150k/yr unless you're in one of the highest cost areas. Alaska is 32%; most midwest states are 17%.
> https://join.tts.gsa.gov/compensation-and-benefits/
That is the page where you find jobs for 18F, nothing there indicates anyone at 18F is not on the GS scale.
It's important to note that that is GS15, step 10, with the maximum locality adjustment (which I think is just Alaska but California is not far behind). GS15 step 1 is going to be $123k before any locality adjustment so still very likely under $150k/yr unless you're in one of the highest cost areas. Alaska is 32%; most midwest states are 17%.