How to go about Negotiating salary with a past employer?

First of all, I'm really grateful for this sub for all the helpful information and discussions. Learned a lot and finally able to get a few Data Scientist roles after 2-3 months of interviewing.

I wanted some advice on salary negotiation - I'm considering joining my previous firm where I worked as Data Analyst in Analytics Team. Now I've been offered a Data Scientist role in the Science Team after my Masters in Analytics and Data Science.

They've already given …

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