I’m collecting evidence for my exceptional promise (technical) endorsement and I have a question related to the recommendation letters. I would really appreciate it if someone could advise me based on their knowledge or experience. For one of my recommendation letters (or reference letter for optional criteria 3), I was going to ask my former line manager who doesn’t work there anymore. Currently, he is a co-founder of a different start-up.
As he was my line manager, I am not sure if I should ask him for the recommendation letter (or reference letter for optional criteria 3). Any advice?