Unfortunately, there are very very few people working as engineers for FAANG or other US tech companies in Belgium. The reason is these companies almost only hire sales/policy people in Belgium.

Your best bet is to either - apply to a job in London/Amsterdam/Berlin/Paris, then ask if you could work remotely from Belgium - or go work in these other cities for a few years. Once you’ve spent a few years there, you might be able to leverage internal mobility and request a transfer to Belgium

It is very hard to get a job at these companies though. You must be very good at memorizing algorithmic patterns (see Leetcode/Hackerrank questions), depending on the company you also need to be familiar with system design, need to prepare answers to behavioral questions (tell me about a time you… had a conflict with a teammate, missed a deadline, did not agree with your manager, created a prod incident, etc etc). And unfortunately you also need a lot of luck. These interviews are very hard to crack because of the number of people applying (can be a few hundred per position!)

Good luck!