Can I get an Engineer/Specialist visa for web/mobile dev in Japan with a French-style BTS diploma (2-year technical degree) ?

I'm currently studying for a BTS (Brevet de Technicien Supérieur) in web and mobile development (a 2-year post-bac technical diploma(2.5 if I add practice stage or internship), same as the French system,I'm from Algeria). I will graduate in 2027.
My goal is to move to Japan after graduation and work as a web/mobile developer with a company-sponsored Engineer/Specialist in Humanities/International Services visa.
I know the standard requirements are usually a bachelor's degree or 10+ years of experience, and that 2-year foreign diplomas like mine are evaluated case-by-case and can be scrutinized. I've seen some success stories (especially from French BTS holders), but also warnings that it's risky even with a strong job offer and portfolio.
Questions:
Has anyone here (or anyone you know) successfully gotten this visa with only a 2-year technical diploma (BTS, DUT, associate degree, etc.) in IT/web dev, especially as a relatively fresh graduate?
What made the application successful? (e.g., strong portfolio, internships, specific companies that sponsored, hiring a scrivener, etc.)
are companies more open to sponsoring juniors with non-bachelor degrees?
Any recent (2024–2025) experiences, since rules sometimes change?
I plan to build a solid GitHub portfolio, do internships/freelance work, and learn Japanese (aiming for N3/N2) in the meantime.

Thanks for the answer kind stranger :).

by taha_Cod6728