Founding Engineer ($170k-$200k + Equity) at Proximitty
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.
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.
Responsibilities
- 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.
Requirements
- 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.
Pay
$170k–$200k + equity
Location
San Francisco, USA