Your use of time travel as a plot device to make us follow the life of this lead designer, Elena Sommer is a genius move. Even though Ian was able to predict her future with his machine, he had other issues he could not solve, so I guess, Elena being able to rewrite his code, made them the power couple.
Now, you left me wondering what they did with the device they made powerful by coming together. Did they change the world with it? Did they use it to save people from tragic events? All in all, it was a beautiful read.
Thank you so much for your insightful comment, @iskawrites. The topic of time traveling is mind-vexing.
Elena actually did not rewrite the code. She just passed on the message that came from the other Ian on the phone. So, the story implies that Ian from the future sent the code to Ian from the present.
I was thinking about this too. In my mind, they are about to embark in a grand time-traveling adventure, like lovers in dangerous times.