Founding Engineer ($170k-$200k + Equity) at Proximitty

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Job Title

Founding Engineer

Salary

$170k-$200k \+ Equity

Company Description

Proximitty is a YC W26-backed fintech building autonomous AI operating systems for the $3T commercial lending market. Founded by veterans from McKinsey and Bloomberg, the company is backed by CRV and angels from Stripe and OpenAI, already tracking toward seven-figure ARR by automating legacy banking workflows for major US financial institutions.

Job Description

As the first Founding Engineer at Proximitty, you will architect and ship frontier AI agents that automate complex commercial loan lifecycles. You’ll own the product end-to-end, from document ingestion to real-time credit decisioning. This role involves working directly with founders and banking clients to deploy autonomous infrastructure in high-stakes, regulated environments.

Location

San Francisco, USA

Why this role is remarkable

• Work on frontier agentic architecture involving long-horizon reasoning and self-healing systems that solve real-world problems in a $3 trillion market.
• Join a high-traction team backed by top-tier investors like Y Combinator and CRV, with a direct path to seven-figure ARR.
• Enjoy a high-trust, low-overhead culture with no standups, fully expensed meals, and a culture that prioritizes physical health and wellbeing.

What You Will Do

• Build and own the core infrastructure for autonomous lending agents using TypeScript, Next.js, and Mastra.
• Deploy code live on client systems by flying to major banks and iterating based on direct feedback from credit officers.
• Create self-evolving agents and evaluation frameworks that ensure reliable performance in high-stakes, regulated financial environments.

The ideal candidate

• Strong background in full-stack and distributed systems engineering, specifically using TypeScript and AWS for production applications.
• Deep curiosity for frontier AI agentic architectures and the ability to build reliable "computer-use" agents for brittle legacy systems.
• A founding-engineer mindset that thrives on ownership, customer empathy, and shipping fast without over-engineering or premature optimization.

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.