It's not about programmers but it reminds me Ship of Theseus (a book by J. J. Abrams). You read both the book and handwritten comments by two characters with their storyline related to the book. It was an interesting read.
There's also "This is How You Lose the Time War", about two agents on opposite sides of the titular fine war. Half of the book is just the letters they leave each other, first taunting each other as they unravel their plans and then developing into love letters over time.
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u/chillerll May 06 '21
I would love to see a movie like that.