To the original poster,
The Regional Head of Operations and middle office is a guy called Peter C. He used to work for BT but then joined Deutsche when the 2 banks merged. He has had about 6 HR Managers in the last 4 years. No one ever lasts because they can't stand working with him. He thinks HR's crap and basically yells at everyone all the time including his HR Generalist. Two of my friends used to be his HR Manager. One found it impossible to work with him so left Deutsche and joined a US Bank. The other person was a lovely Singaporean lady who just couldn't cope with his demands or bad temper. She has also left the bank. The other thing that you need to be aware of is that none of these HR people could work with the Regional Head of HR who looks after IT & Ops. She has a very difficult personality and treats her subordinates pretty badly. She is an expat from Australia.
The person who heads up middle office is a Kiwi guy called Andrew L.
There are a lot of HR opportunities right now in Singapore. A number of banks are actively recruiting - StanChart, Citibank, DBS & Deutsche are all looking for good HR people. They are also open to expats.
Don't feel pressured to take the job at Deutsche. They are really in a mess.
Good luck!