She took on the position as a spring board into further careers and only wanted to work there for two years.

Thanks :)

Google prefers career stepping stone, so I'll use that.

I much prefer spring-board and Liz's translation. Sounds more idiomatic (but maybe in BE).

And our old careers magazine at school was called Spring Board, so maybe I'm biased!

frei übersetzt

also career booster hört sich nicht sehr ernsthaft an :)