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Replit is the agentic software creation platform that enables anyone to build applications using natural language. With millions of users worldwide, Replit is democratizing software development by removing traditional barriers to application creation. About The Role As a Senior Product Engineer on Replit’s Product Platform team , you’ll build the shared product systems and primitives that power Replit’s core experiences — enabling product teams to ship faster and helping users (and agents) build better software. The nature of software development has changed and Replit is at the forefront of that revolution. The product platform team builds and scales the primitives that Replit Agent uses to empower over 40 million users to build anything they want. This role is ideal for a senior platform-minded web engineer who’s shipped at scale, thrives in high-ownership environments, and can define what “good” looks like across reliability, performance, and developer experience. We’ve hit a significant scale and have escape velocity. A number of our systems need to be scaled and rebuilt, so you’ll get to build these out for 0 → 1 → huge scale quickly. You’ll work closely with product other engineers, platform engineers, designers, product managers, and go-to-market partners to deliver foundational capabilities that unlock entire categories of product development. This is why we require product engineers with a strong product sense and past distributed systems experience that are excited about building at scale platform primitives! What you’ll do Lead major cross-team platform initiatives , taking foundational systems from 0 → 1 and scaling them to support millions of users Build shared, extensible Agent primitives that Replit Agent can reuse safely and consistently (Meta Programming) Identify the highest-leverage technical bottlenecks (performance, reliability, correctness, abuse, observability), then design and ship solutions for our scale Raise the bar for engineering excelle