Sofia Hartmann joined PlayOnStake as a slots specialist after studying mathematics and probability at the University of Vienna. Her analytical background gave her a unique edge: where others see a slot game, Sofia sees a probability model — one she systematically tests across hundreds of real-money spins before publishing any review.
Every week, Sofia tests new slot releases across 40+ crypto casinos — analysing RTP accuracy, actual hit frequency, bonus feature trigger rates, and max win potential so players know exactly what they're spinning before they stake a single coin. She has reviewed over 1,200 titles to date across all major providers.
Sofia is a strong advocate for accurate RTP disclosure and calls out providers whose published figures don't hold up under real-session testing. Outside of work, she is an avid poker player and regularly contributes to probability discussions in crypto gaming communities.
