Founding Product Engineer

AgentMail (YC S25); San Francisco (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

AgentMail is building the communication infrastructure for AI agents in San Francisco. We’re seeking a Founding Product Engineer to define what using AgentMail feels like and own products from ambiguous problems to developer-facing solutions.

You will ship polished frontend work and robust backend services, talk directly to customers, and turn insights into shipped software while shaping the developer experience and product engineering culture.

Qualifications

• Ship polished frontend and robust backend features.
• Interview customers to understand problems.
• Turn problems into shipped product quickly.

Responsibilities

• Own end-to-end product from problem to shipped software.
• Build across frontend, APIs, data models, infra.
• Interview developers and review usage data.
• Shape developer experience: onboarding, APIs, docs.
• Prototype ideas from customer conversations quickly.
• Influence product design and interaction patterns.

Skills

Full-stack

Frontend

Backend

Customer interviews

Product mindset

Job description

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 1 billion+ 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..
• 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 Will Be a Good Fit If

• You’re a strong full-stack engineer. You can ship polished frontend work and handle the backend it needs (APIs, data models, queues) without hand-holding..
• You have sharp product taste. You notice when something feels off, whether it’s a UI, an API, a doc, or an error message, and you care enough to fix it..
• You can take a vague problems 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 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 without asking..

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.

If this sounds like you, come join us.