Senior Full-Stack AI Product Engineer Cross-Platform

HappyScribe in Barcelona is looking for an experienced engineer to join the Engagement pod. You’ll own a product area from day one across Rails backend and React web, React Native mobile, and Electron desktop apps. Work with a designer to decide what to build, prototype it, ship it with coding agents, and validate it with evidence. You’ll grow the design system, contribute to architecture decisions, and help the team balance speed with rigor in a hybrid, English‑fluent environment. J-18808-Ljbf…