# Software Engineer, Payment Interfaces at Block

- Company: Block
- What the company does: Backed by 500 Global.
- Company website: https://blockblock.io
- Type: Startups (AI role)
- Level: Mid level
- Location: Bay Area, CA, United States of America
- Work setup: On-site
- Posted: 2026-09-18
- Apply by: 2026-11-02
- Apply: http://block.xyz/careers/jobs/5426213008?gh_jid=5426213008
- Page: https://www.1752.vc/careers/jobs/block-software-engineer-payment-interfaces/

## About the role

Payment Interfaces builds and operates the APIs and services that power payment experiences across Block, including Square, Cash App, and Afterpay. Our systems process payment traffic worldwide, helping sellers accept payments and customers move money reliably and securely.

## What they're looking for

- Experience building, maintaining, and scaling customer-facing financial or payment APIs, together with a strong understanding of payments. This is a requirement for the role
- Experience designing and operating high-volume, highly available distributed systems where correctness, security, and reliability matter
- An understanding of payment API concerns such as idempotency, retries, asynchronous processing, backward compatibility, and handling partial failures without compromising financial correctness
- A record of leading complex engineering projects from unclear requirements through production, making technical trade-offs, and coordinating work with partner teams
- Experience diagnosing production issues and improving systems through monitoring, incident response, and preventive engineering
- Fluency with AI-assisted engineering tools and the judgment to validate generated code, protect sensitive data, and recognize when deeper investigation is needed

Tags: Engineering - Fintech Platform