[Matthias247]

I worked at one of these OEMs for nearly 10 years - and have contact to the others. Believe me, I know something about the industry. All these companies have big engineering departments - even for mostly software related topics like Infotainment). However most engineers there will be mainly responsible for writing specifications and project management. Implementation is done by suppliers. E.g. Audi Infotainment -> Mainly implemented by E-Solutions. It's similar for VW, Porsche, BMW and Mercedes - I'm aware of their external partners, but as that is partly confidential I won't go into detail. Of course there are also some research projects and departments and cooperations with universities, but they are only a tiny fraction compared to series development efforts. In resarch and predevelopment projects you might find more inhouse engineers, mass production software is however mostly contracted.

And regarding outsourcing to India: If you read through the software related job postings of Bosch you will quite often find the phrase: "You are the Software Architect and are responsible for coordinating our Indian implementation team". When I looked last time there were a lot more of these postings than "we are looking for an excellent software engineer with skills in X/Y/Z".