I had never heard of humblebragging until I read this piece on it. Apparently it's a backhanded complaint combined with some level of bravado about your life. You should read the piece, and make sure you aren't using too much in your public persona.
I've noted that humility is important, but not in a job interview. That's certainly true, but make sure when you talk about yourself in a positive way, you do so with confidence and authority. I'll include honest as well, and don't humblebrag. It's a turn off, or maybe a sign that you are either covering something up or you don't really believe in yourself.
Prepare for the interview. Talk about yourself openly, emphasize what you do well, with confidence, and admit what you don't know.
Above all, make sure you are using "The Test" in your public writing and posting about your career. You never know when the interviewer will have researched your posts and have doubts or concerns about the way you portray yourself. Be careful what you post, and temper your honesty with some good judgment about what you disclose about how you conduct yourself, as well as what you know about your particular field.
This sounds like you're managing your life by being careful about posts, but it's really managing your career. If you want to be free about all of your life, I really, really encourage you to have a separate account or blog for your career.