Lost in the fog between idea and product?
We help ambitious teams turn bold ideas into products people love.
From early-stage hypotheses to development-ready experiences, we bring clarity, speed, and human-centered design to your most important innovations.
We've worked with
Who we are
mountaineer.studio is Sarah Mennicken & Karl Humphreys. While we're wanna-be mountaineers in the actual Alps, we've been navigating uncertain terrain together for 7+ years, including on three of Spotify's ambitious zero-to-one "Mountain Bets."
Sarah's deep expertise in emerging tech and human-centered research meets Karl's design leadership at scale and a track record of shipping products that reach millions. Together, we give teams the clarity, speed, and confidence to move from rough idea to MVP.
mountaineer.studio means we guide you there. We help you define what to build, prototype rapidly, and ship with conviction, using sharp thinking, smart experiments, and pragmatic tech choices that let you learn fast and build momentum.