Founding Product Engineer

San Francisco, CA · In-person AgentMail is building the communication infrastructure for AI agents. Today, AI agents can write code, browse the internet, and take actions on behalf of people—but they still struggle to communicate and operate independently across the services humans use every day. AgentMail gives agents their own email identities and infrastructure to send, receive, and act on email programmatically. We’ve processed hundreds of millions of emails and serve developers building some of the most ambitious agentic products. We’re looking for a Founding Product Engineer to help define what using AgentMail actually feels like. WHAT YOU’LL DO You’ll own products from an ambiguous customer problem to something developers use every day. That means you’ll: - Build products end-to-end. Work across polished frontend experiences, APIs, backend services, data models, and infrastructure when the product calls for it. - Talk directly to customers. Interview developers, watch them use AgentMail, dig through support conversations and usage data, and understand where they’re getting stuck. - Turn customer problems into products. Figure out what should be built—not just how to build it—and develop conviction about which problems are actually worth solving. - Build AgentMail Studio. Help create the interface developers use to understand, debug, and interact with their agents’ email—from inspecting messages and threads to testing workflows and understanding what happened under the hood. - Shape our developer experience. Improve everything between a developer signing up and getting something useful into production: onboarding, SDKs, APIs, debugging tools, docs, and the console. - Prototype quickly. Turn an idea from a customer conversation into something they can use days later. - Sweat the details. We care deeply about how our products look, feel, and behave. You’ll have significant influence over the design and interaction patterns of AgentMail. - Help define the product engineering culture. You’ll be one of the earliest engineers explicitly focused on product and will shape how we build products as the team grows. WHO WE’RE LOOKING FOR We’re looking for an engineer who thinks about the why behind what they’re building. You might be a great fit if: - You’re an exceptional frontend engineer with strong product and design instincts. - You have strong engineering fundamentals and are comfortable going beyond the frontend—working with APIs, backend systems, databases, queues, and distributed systems when necessary. - You can take a vague problem like “developers can’t figure out why their agent didn’t respond to this email” and turn it into a product without waiting for a detailed spec. - You enjoy talking to customers and can separate what someone asks for from the underlying problem they’re actually trying to solve. - You can contextualize technical decisions in terms of customer and business impact. - You care about API design and developer experience, not just UI. - You have strong opinions about products but are willing to change your mind when the data or customer evidence says otherwise. - You’re comfortable moving quickly, shipping imperfect things, learning from usage, and iterating. - You have extremely high agency. When something is broken or missing, your instinct is to fix it. You don’t need to have been called a “Product Engineer” before. We’re much more interested in whether you’ve built things people love and whether you can independently go from customer problem → idea → product → shipped software → learning. WHAT THIS ROLE IS NOT This isn’t a role where a PM hands you a spec and a designer hands you a Figma file. You’ll be expected to participate in the entire product process: talking to users, deciding what matters, designing solutions, writing the code, shipping them, and figuring out whether they worked. You’ll have a tremendous amount of autonomy—and an equally high bar for ownership. WHY AGENTMAIL Work on a new category. We’re building infrastructure for a world where billions of AI agents need identities and ways to communicate with humans, businesses, and each other. Build for builders. Our customers are developers. You’ll work directly with highly technical users and see the impact of what you ship immediately. Own meaningful product surface area. We’re still early enough that fundamental pieces of the AgentMail experience haven’t been invented yet. You won’t be optimizing a button that’s been A/B tested for five years. You’ll help decide what the product becomes. Move extremely fast. Customer conversations can become products within days. You’ll have the autonomy and resources to build without layers of process. Have outsized influence. You’ll work directly with the founders and early engineering team and help establish how product engineering works at AgentMail. We believe the interface between AI agents and the rest of the internet is still being invented. Come help us build it.