Questions & Answers about Надеюсь, мы увидимся в выходные.
Yes. Надеюсь is the 1st person singular form of the verb надеяться (to hope), so the subject я is already built into the verb ending.
- Надеюсь = I hope
- Я надеюсь = I hope too, but with the pronoun stated explicitly
Russian often omits subject pronouns when they are clear from the verb form. So Надеюсь, мы увидимся в выходные is completely natural.
The comma is standard here because Надеюсь is functioning a bit like an introductory phrase, similar to I hope at the beginning of an English sentence.
So Russian writes:
- Надеюсь, мы увидимся в выходные.
This punctuation helps separate the speaker’s attitude (I hope) from the main statement (we’ll see each other on the weekend).
You may also see other similar sentence-openers set off by commas, such as:
- Думаю, ... = I think, ...
- Кажется, ... = It seems, ...