# Backend Engineer, Underwriting

**Company:** [Pylon](https://hotfix.jobs/companies/pylon)
**Location:** Palo Alto, CA, San Francisco, CA
**Role:** Backend Engineering
**Salary:** $130k – $220k/yr
**Skills:** TypeScript, Nestjs, GraphQL, Postgres, Temporal.Io, Dsls, AI/ML, SQL
**Posted:** 2026-04-13

> Builds backend systems to automate mortgage underwriting by encoding regulatory rules into precise, AI-enhanced code. Collaborates with experts using TypeScript, NestJS, GraphQL, and custom DSLs for high-stakes lending decisions.

## Job Description

## Responsibilities
- Encode natural language rules into code using DSLs, novel techniques including AI, to translate regulatory guidelines into executable logic.
- Work side-by-side with mortgage experts to understand nuances, exceptions, and domain complexity.
- Build systems prioritizing correctness, precision, robust test coverage, and failure mode analysis.
- Push into uncharted territory with AI applications in mortgage underwriting.
- Automate complex, regulated processes to make mortgages faster, cheaper, and more accessible.

## Tech Stack
- **TypeScript**
- Custom DSLs for rule encoding
- AI/ML tooling and agentic infrastructure
- NestJS + GraphQL
- SQL (PostgreSQL)
- Temporal.io (workflow orchestration)

## Requirements
- Deeply curious
- Owns features from design to development, deployment, and maintenance
- Willing to solve the hardest problems

## Compensation
Base Salary Range: $140,000/yr to $220,000/yr + Equity + Benefits

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**Canonical:** https://hotfix.jobs/jobs/dbcd03c9-9876-4066-af0e-125530a61a43