AI Agent Engineer

AI Agent EngineerConsumer AI Start UpREMOTE (US ONLY – PST HOURS)Up to $250K + Equity My client is building the TikTok of interactive mini-apps — a consumer social platform where users scroll a feed of playable experiences and create their own simply by describing what they want. Our AI-powered creation flow turns natural language into shareable, interactive content. Backed by a16z, Mayfield, and Khosla, founded in 2024, and already at 5M+ MAUs. About This RoleWe are looking for an AI Agent Engineer to own and set the technical bar for our coding agent — the core engine that turns natural language into working, shareable interactive mini-apps. This is a high-ownership role where you will lead architecture decisions end-to-end and directly shape the creation experience for our 1M+ monthly active users. Responsibilities • Design and own the agent runtime and orchestration layer for our coding agent • Build long-horizon agent workflows: prompt → plan → generate → run/validate → repair → publish • Develop robust evaluation and quality loops including eval harnesses, regression testing, and failure taxonomy • Design model strategies including routing, benchmarking, reliability improvements, and cost/latency optimization • Create debuggable agent systems with tracing, metrics, alerts, and observability Role requirements • 1 - 8 years of experience in production AI agentic systems or AI/ML engineering. • Experience building agentic systems OR AI/ML engineering in a production environment. • Shipped in large, shared codebases at scale. • Experience at a VC- backed AI startup — coding agent or developer tool company strongly preferred. • Experience building a coding agent, devtool, or IDE assistant. • Bachelor's degree in Computer Science or related field. • Strong proficiency in Python. • Experience building agent evaluation frameworks including eval harnesses, A/B testing agent changes, and statistically grounded model measurement. • Familiarity with modern agent frameworks, specifically LangGraph and Pydantic AI. • Experience in async programming and distributed systems – Kafka, Spark, Flink, or equivalent. • Communicates impact in business terms — resume should reflect measurable outcomes on users/product, not just technical metrics. • Must be able to work remotely in PST, with a Sunday evening standup. • AI- native — actively follows latest agent framework releases, open source updates, and eval tooling. Why candidates should join • Rare consumer social bet: One of the only US consumer social startups in the AI era — building the TikTok of interactive mini-apps. 1M+ MAUs with real product-market signal. • Hypergrowth: $30M raised from a16z, Mayfield, and Khosla. $150M post-money valuation with a Series A actively closing. • Exceptional founder pedigree: CEO is a former Director of Product Management at ByteDance — deep consumer social DNA from day one. • Own the core engine: The coding agent is the product's moat — you're designing the system that turns natural language into playable experiences for 1M+ monthly active users. Why this Role? • End-to-end ownership: Design the runtime, own the eval framework, make model strategy calls. Tech lead scope from day one. • Greenfield architecture: We built our own agent framework from scratch. You're setting the technical bar, not inheriting legacy decisions. • Comp: $150K–$250K base + equity in a $150M valuation company.