I would interpret in thirty years to mean thirty years from now. I would interpret after thirty years to mean thirty years from when you started working there. If you just started working there, they would be the same.
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I would interpret in thirty years to mean thirty years from now. I would interpret after thirty years to mean thirty years from when you started working there. If you just started working there, they would be the same. If you have been working there for several years already, they would be different.