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

About the role

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.

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.

Location

San Francisco, USA

Pay

$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.