: What language should I write my programming blog post in? My background I'm a native French speaker and a software engineer, I studied in French and grew up speaking French. My Question is: which

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There is no definite answer - you already mentioned the most important points
English means a bigger audience. Most of the world can speak English and can therefore understand you, which leads to a far bigger audience. The bigger audience also means that the quality is potentially higher - more people interacting with your stuff means that more people will voice their opinions about style, preferences, tips, ...
French may be easier for you and therefore you might be able to post more.
Depending on your goal you should think about what is important: do you have something to say where it's important that many people interact with your Blog or do you for example view this as a little pet project?
To make this a bit more explicit: I have a few hobbies where I don't really care about how many people interact with me. Jogging is such a hobby. It doesn't matter to me if people even know that I have this hobby. I am doing this solely for myself. If you want to write a Blog to improve your writing techniques in general, or because you like the idea of being able to say "I have written a tech-blog once!" or you think that it's important to regularly post something so that you will stay motivated - then you might want to go with writing in French.
If your goal on the other hand is to help as many people as possible because you want to write about a difficult topic or because you want to write about something that only a handful of people are doing all over the world or because you feel that the wider audience will help you stay focused - then you might want to go with English. If you are worried about your English (which, by the way, is quite good) you might want to see if you know someone who is willing to help you with copy-editing. Or you could mention that on your Blog so that people reading your Blog might help you. This could further improve your English and might be another motivator - other people mean that you might have to discuss your schedule with others. Don't be afraid that the English language will hold you back too much - just write and ask for a bit of help, it won't be a show-stopper for you.
But in the end it's up to you - what do you feel comfortable with?

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