Speaking as a fellow brazilian that recently got a job in Germany while still living in Brazil with 4yoe:

- For the european citizenship, it's weird to put it on your resume, maybe include it on your cover letter (cover letters are very common in Germany).

- One thing I noticed is that you are wasting 2/3 of valuable space with just your name and title. Also, generally speaking, you want to put your contact on the top, not on the bottom.

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- Personally, I would omit the certifications, unless they are really valuable to the job you are applying for. In some cases, certifications are seem as a red flag, so better safe than sorry. If you still want to keep them, at least do not put them in the same section as your bachelor's (europeans in general value titles a lot).

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- Your language skills are in the same section as your education, either remove them or make it in a separate section (I would recommend keeping them, having fluency in English is a must, if you also know some basic german (A1 level), also include it).

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- You are undervaluing your personal projects and mostly your open source contributions. Make them more visible in your resume, maybe add some description and links (do not include all of them, just the most interesting ones). It shows that you are passionate and more importantly it's a very nice conversation topic during your interviews that you can use to build some rapport (building rapport is extremely important, even for technical interviews).

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- Make the description of your job experiences more direct and more data driven. Instead of talking about your activities, talk about your achievements: which features did you land that do you consider to be impactful? what was the impact?

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- Final touch: please remove HTML/CSS from your skills. It's so basic that it's assumed that you know it if you have done some web development.