Join a small founding team to build and ship a cross-platform iOS/Android social marketplace app. Implement JS-based mobile features, photo filters and video editing, translate designs to production, integrate with backend and AI services, and own the full development lifecycle in a fast-moving startup aiming to launch in 4–6 months.

Design, build, and maintain scalable backend services and APIs; implement authentication and secure session flows; develop real-time data pipelines and media handling; architect and migrate database schemas (Postgres to DynamoDB); collaborate with mobile/frontend teams to deliver low-latency consumer experiences; participate in full SDLC in a fast-moving startup environment.