Founding AI Engineer at Pingo AI

We’re hiring a Founding AI Engineer to build the intelligence layer for the leading AI companion for language learning. You’ll own the core AI systems powering personalized conversations for millions of users. Language learning shouldn’t feel like an app — it should feel like talking to someone who knows you: remembers what you struggled with last week, adapts in real time, and responds instantly. Building that means solving hard systems problems at consumer scale: long-term memory, real-time speech, sub-second latency, adaptive dialogue, and personalized content. About Pingo Pingo helps 3,000,000+ users build fluency through real conversations. Since launching in January 2025, we’ve grown to $6 million ARR with ~50% MoM growth. Backed by Y Combinator and top investors, we’re building a small, talent-dense team obsessed with product quality and engineering rigor. What You’ll Do In one sentence: Build the systems that make Pingo the default way people learn languages. Define and own our AI architecture and roadmap, and build the AI team as we scale. Architect memory & personalization — design scalable long-term memory and retrieval, build a content engine that generates structured,