# Backend Engineer, API

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

> Builds and maintains a production GraphQL API modeling complex, nonlinear mortgage processes. Designs event-driven systems, semantic models, and developer-friendly abstractions using TypeScript, NestJS, and Temporal.io.

## Job Description

## Responsibilities
- Define semantic models for mortgages in code, expanding what a mortgage can be — product design at the API layer.
- Build toward an event-driven API that responds to requests and proactively informs about events, reasons, and next actions.
- Make complex mortgage processes feel simple through thoughtful abstractions, clear documentation, and focus on developer experience.
- Design for nonlinearity, encoding choice, branching, and path-dependence natively for guided experiences.
- Treat the API as a product surface: manage breaking changes, versioning, onboarding, and full lifecycle.

## Tech Stack
- **TypeScript**
- **GraphQL** (core product)
- **NestJS**
- **SQL (PostgreSQL)**
- **Temporal.io** (workflow orchestration)
- **Event-driven architecture**
- **AI-driven development tooling and agentic infrastructure**

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

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**Apply:** https://hotfix.jobs/jobs/7a84fe03-10ed-4a3f-a833-bc6038338ed8
**Canonical:** https://hotfix.jobs/jobs/7a84fe03-10ed-4a3f-a833-bc6038338ed8