Applied online. Two interviews, one coding test. Took about 3-4 weeks. Needed to remind about myself to go to next stage every time. The coding test is very weak, some tasks are too easy, some are too far from reality. No technical questions on technical interview, only about my background, the stack i was working with. Though my primary stack (last years of experience) meets exactly 100% their needs: language, framework(s), database(s), type of project, and salary expectations were reasonable (as recruiter said), i got rejected without a bit of feedback. The development team seems to be good, but recruiting process looks very unprofessional. Very disappointed in Mozilla.