Senior AI Engineer at well-funded AI infrastructure startup

As a Senior AI Engineer, you will build systems where AI agents work alongside humans. You will move beyond writing manual code to designing the specs, harnesses, and evals that ensure agent reliability. Working across TypeScript and Python, you will own features end-to-end, creating high-impact tools that redefine how people and machines collaborate., * Join a forward-thinking team where AI agents write the majority of the code while you act as the architect and human-at-the-helm.

• Backed by top-tier VCs, this startup is building the essential verification layer for a future where every AI acts on behalf of an accountable human.
• You will have total autonomy to own features from wireframe to production across products focused on AI-native recruiting and professional workflows.

What You Will Do

• Own end-to-end features across a TypeScript/Node API, a Python agent runtime, and a Next.js frontend architecture.
• Build and harden agentic workflows with humans-in-the-loop, including drafting pipelines, review queues, and escalation logic to ensure output quality.
• Develop quality infrastructure including eval sets that gate CI, guardrails traced to real incidents, and regression tests that pin every fix.

• Has 5+ years of experience shipping production software across the stack with high proficiency in both TypeScript and Python.
• Has successfully shipped at least one LLM-powered system to real users, featuring robust evals, guardrails, and failure-mode management.
• Demonstrates high CLI fluency and experience building custom harnesses, such as MCP servers or context engineering tools, to direct agents effectively.

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.

About Jack & Jill