This is absolutely amazing, the fact that you can click on text and it takes you immediately to the part of the audio where that text is being said is great.
I wish the video was shown as well, but other than that, excellent work!
I'm a Software Engineer from Argentina, strongly experienced in algorithms and data structures (from programming competitions like IOI and ICPC), and web development in general.
I'm open to chat in general about your company to see if there is a good match. In the worst case, having an extra connection is always beneficial for both.
I wish the video was shown as well, but other than that, excellent work!