Every company is different in terms of how they handle the interview process, but when it comes to companies like Facebook and Google, I have heard that knowing current employees is a big help especially if they have worked with you before. Besides that, I would say their process is differently not systematic enough that you can check off all the boxes and expect to get a job. There are many stories of people that are more than qualified than most people that did not land a job. They are large enough that they have that luxury.

I don't know your specific situation, but I would start talking ALOT with current employees, perfect your specific skills (be great at 1 thing, not ok at a lot), and keep trying :)

If you want to hop on a call I can help you with your specific situation. I have gotten pretty far in the interview process at Google, before I decided not to proceed and instead started my current startup Due.com.

The winning strategy to get an interview is to emerge from the hundreds or thousands applications the company receives for the same job. Such companies could receive even up 300-500 applications in one day, so how could you get your application noted by the HR team?
1- You might want to include a summary in your CV, and a cover letter to accompany your application, that contains the magic words, crystal clear those skills that are requested: the recruiter will not spend more than 20-30 seconds on your CV, be sure he can read what he is looking for. Only if you obtain his interest he would move forward to read the rest of your CV.
2- Networking. This is a MUST. Try to reach out other employees (directly or through other contacts), get them linked to you on LinkedIn (send requests to 4-5 employees, only 1 or 2 would accept), participate to events where you will find other employees of the company. The most effective way to present your application is through an employer of the company (referrals).
3- Unfortunately, remember that when you see a job posting that has been published, it means that the company already tried to cover the position using all its direct contacts (see point 2 above).

Very short Answer experienced Job searcher: Connection! Online portal are b"""t. Just focus on making strangers frieds (working in your dream company) and asking for referrals, that s the corporate world sadly. Regular 10 min Coffee and then next. Never speak about job the first interaction. Always being interested about the matter, product, the dream behind. Let me know if i am resuming enough.

The most effective way to reach you target is to circle the wagons. My name is Vincent Gomory and I have 30 years of career coaching experience. First, do a detailed Linkedin analysis of contacts/employees related to the person you want to reach. Analyze their chronologies. Is there a pattern? Do you fit the profile of a person who works on that team? If so, make contact through in-mail, phone, and personal email to obtain informational interviews. I recommend Get Five (formerly The 5 O'Clock Club) books and tapes which provide an effective strategy for approaching your target's key influencers (the team members). The most important aspect of networking with these people is to find out what the culture is like at these companies. Many people have professional experience - but its the cultural fit that drives the interview to the next step. This article may help: https://www.thebalancecareers.com/assess-cultural-fit-when-interviewing-candidates-1918087. I am available for calls to answer any questions and provide a strategy for you to move forward.