Founding Engineer

AgentMail is building an API designed to give inboxes to AI agents and be the sole identity + communication provider. It isn't AI for your email, it's email for your AI. We're looking for a founding engineer with strong backend and infra instincts to help build the primitives agents will use to communicate, authenticate, and operate in the real world. This is a role for someone who likes systems work: APIs, distributed infrastructure, reliability, developer tooling.

Company highlights:

• World-Class Team: Founded by a team of experts (Quant, SWE, Private Equity), with backgrounds from Optiver, NVIDIA, Amazon, Modern Treasury, KKR.
• Hypergrowth: We've doubled our user count every 2 weeks since January.
• Competitive-edge: We are the sole identity provider for agents.

What you'll do:

• Design APIs and abstractions that are intuitive for both humans and AI Agents
• Build high-performant, low-latency systems with the idea that agents are the end-users in mind
• Get your hands dirty by touching our core infrastructure that processes hundreds of thousands of emails per day
• Think creatively about being the bridge between cutting edge AI capabilities with email
• Own projects end-to-end, from system design to production rollout

What we're looking for:

• Want to solve problems end-to-end across frontend, infrastructure, backend, and UX
• High bar for quality
• Clear thinker and communicator
• Highly technical, prior experience shipping production software

Bonus: Cloud infrastructure, distributed systems, developer tools experience; messaging, email, auth, or protocol-heavy systems; AI/LLM use cases.

Compensation:

• $150k-$250k base
• 0.5%-1.5% equity
• Medical, dental, and vision insurance
• Equinox memberships
• Free Doordash for breakfast/lunch/dinner

Location: San Francisco, CA (on-site).