HackerRank link with the specific two problems and two phone interviews using HackerRank.

They replied to email very fast and rescheduled one interview because there was some signal issue with my phone.

1st phone interview:

• Two problems: reverse the order of words in a sentence, and for the second one, four numbers were missing, and you had to find them.

2nd phone interview:

• Traverse a binary tree and append the values to a string.
• Use the string from part 1 to reconstruct the tree.
• Unfortunately, it's impossible to reconstruct a binary tree with only post-traversal, however, you can reconstruct a binary search tree.

At the end, I received an email telling me that they were looking only for seniors.