Founding Engineer ($150k - $250k + Equity) at $6M Seed AI infrastructure startup

Job Description

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Job Title

Founding Engineer

Salary

$150k - $250k + Equity

Company Description

$6M Seed AI infrastructure startup backed by General Catalyst and Paul Graham

Job Description

As a Founding Engineer at this YC S25 startup, you will build the critical identity and communication layer for the agentic era. You will design high-throughput backend systems and APIs that serve as the inbox for AI agents, enabling them to communicate and authenticate as independent digital citizens in a rapidly expanding market.

Location

San Francisco, USA

Why this role is remarkable

Work at the frontier of AI infrastructure with $6M in funding from General Catalyst, Paul Graham, and the CTO of HubSpot.
Join a high-performance team of 8 hailing from NVIDIA, Amazon, and Optiver, currently doubling their user count every two weeks.
True founding impact with significant equity and the opportunity to define a new category of the internet where agents outnumber humans.

What You Will Do

Design and implement intuitive APIs and abstractions that allow AI agents to operate as first-class citizens of the internet.
Build and scale distributed systems and core infrastructure capable of processing over 100 million emails per day with low latency.
Own projects end-to-end, from initial system design to production rollout, while collaborating directly with the founding team and customers.

The ideal candidate

Strong backend and systems engineering background with experience shipping production-grade software at a high-growth tech company or startup.
Deep understanding of distributed systems, cloud infrastructure, or developer tools, with a preference for messaging and protocol-heavy experience.
High-velocity builder who thrives in ambiguity and obsesses over quality, detail, and solving complex problems from 0 to 1.

Who are Jack & Jill?

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

How does this work?

Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.