Backend Engineer, Underwriting

Overview

America’s $13T mortgage market is a vital financial system that underwrites the middle class, enabling millions of families to build wealth. While other financial instruments have been simplified to an API call, mortgages remain largely assembled by hand. Pylon is building the first vertically integrated mortgage platform that turns origination into a single API.

Publicly traded companies and the country’s largest originators are already building on Pylon. Revenue is compounding monthly, and we are backed by Peter Thiel, Conversion Capital, QED, Citi, Fifth Wall, and the founders of Ramp, Blend, and Mercury.

We’re looking for Back End Engineers to join our Underwriting team. This team takes human judgment out of mortgage origination, replacing it with systems that are faster, more consistent, and more accurate than any human process could be.

• Encode natural language rules into code, working with DSLs and novel techniques—including AI—to translate dense regulatory guidelines into executable logic.
• Pair with mortgage experts to understand nuance, exceptions, and the "it depends" that makes this domain hard.
• Build systems where correctness is paramount: design for precision, develop robust test coverage, and consider failure modes deeply.
• Push into uncharted territory by applying AI in ways the mortgage industry has not seen, helping define what's possible rather than just implementing what already exists.
• Automate complex, regulated processes, bringing mortgages closer to a world where they are faster, cheaper, and more accessible.

• Type Script
• Custom DSLs for rule encoding
• AI/ML tooling and agentic infrastructure
• NestJS with GraphQL
• SQL (Postgre
  
  SQL)
• Temporal.io for workflow orchestration

• Is deeply curious.
• Wants to own features from design through deployment and maintenance.
• Is willing to put in the work to solve the hardest problems.

Location:

Palo Alto, CA
Base Salary Range: $140,000/yr to $220,000/yr + Equity + Benefits
Compensation Range: $130K – $220K