Full Stack Engineer - Founding Engineer

Join Hire Hangar and work with fast-growing global companies while building a long-term, remote career. Job Title: Founding Software Engineer (Full-Stack) Location | On-Site — San Francisco, CA Time Zone | PST Role Overview: We are seeking a Founding Software Engineer to join one of the earliest technical teams at a fast-moving AI video infrastructure startup. The company's first product turns prompts and documents into whiteboard-style explainer videos in seconds, with a broader vision to make video generation fast, cheap, and programmable enough for AI to use video anywhere it uses text today. This is one of three founding engineering hires, and the role involves owning major parts of the core product experience across frontend, backend, user workflows, and developer-facing surfaces. The ideal candidate can take ambiguous product goals and turn them into polished, reliable software, shipping across the full stack without needing narrow boundaries or someone to hand them a spec. You will work directly with the founder, make real technical decisions, and help define how engineering works at the company from the ground up. Key Responsibilities: - Build and ship user-facing product features from idea to production - Design backend APIs and product flows for accounts, projects, jobs, assets, usage, billing-related workflows, and collaboration - Build frontend experiences that fee...