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I am a master CS student who just graduated and is trying to find job. I have no prior work experience and I am in a pretty confused state about what I should be doing

1. I was told to do leetcode by a lot fellows and was suggested that it is the only technical stuff I should be preparing. I have been doing leetcode for a pretty long time and finished 500 ones, proficient in around 300 questions. However because my resume does not goes through HR most of the times and the question base grows day by day, it depletes my stamina to continue solving algorithm questions.




2. I have been applying jobs online through glassdoor/indeed and the response rate is low, and I do not know how HR filters the resume. Is it necessary to network with the people in the group relevant with the job position before I apply?




3. I have a friend who plans to open a restaurant and she wants me to write a online ordering system for her. I feel it could be a good plus on my resume and I accepted that. However I feel it could take me a lot time and energy to build a full-stack commercial app and doubt if it is worth it.




4. Is there any other technical stuff I should be learning? or I should just be sticking on algorithm questions?

I was told to do leetcode by a lot fellows and was suggested that it is the only technical stuff I should be preparing. [...]

Is there any other technical stuff I should be learning? or I should just be sticking on algorithm questions?

You say you are a CS Masters graduate. I think that you should by now already know a good deal of technical stuff.

Of course, continue pursuing your interests, but with a Master in CS you already should have good skills that should enable you to perform well on a CS job.

Furthermore, you should try to learn or strengthen topics that are valuable in the industry and kinds of job you want. It's very different what is required for a, say, Deep Learning developer than a Frontend Developer. Decide what you want to work on and focus on strengthening skills relevant to that.

I have been applying jobs online through glassdoor/indeed and the response rate is low, and I do not know how HR filters the resume. Is it necessary to network with the people in the group relevant with the job position before I apply?

I've heard that those sites do not have the fastest response rates out there. Even if they did, it's expected that sometimes response rates are slow.

Networking always helps. It's not the only thing that matter, but it does help.

I have a friend who plans to open a resturant and she wants me to write a online ordering system for her. I feel it could be a good plus on my resume and I accepted that. However I feel it could take me a lot time and energy to build a full-stack commercial app and doubt if it is worth it.

If it's going to (1) give you some income, (2) let you hone your dev skills further, and (3) give you some experience you can put on your resume (which you currently lack), then I say it's worth it.

I suggest you at least consider meeting with this friend, so you can get into more detail on the idea. That way you will get a better idea of the extent and feasibility of doing it, and be able to decide if you take it or not.