I am a PhD student in cybersecurity. I am close to finishing my PhD. I need to submit one paper to a journal and write one conference paper, then I am ready to write my thesis.
I got a postdoc position in a great research lab. The tentative start date is the beginning of May. They asked for a letter from my supervisor, stating that I am going to defend before the beginning of May. However, my supervisor keeps on telling me he can only state that I can submit my thesis before that date. He wrote a letter for that. I am worried that I may miss the opportunity because of my supervisor. I am not happy in the country in which I am doing my PhD. So, I want to get out of this country, too.
My question: can postdoc offers usually be delayed for a short time? Do they allow the student to start working after they submit their thesis even if they did not defend yet?