Job Title: Senior Backend Engineer

Company Name: Stay AI

Job Url: https://jobs.ashbyhq.com/stayai/84e18af1-e5c7-44d5-a147-22e933932002

Job Description: As a Senior Backend Engineer at Stay AI, you will architect and build the core systems that ensure Stay operates seamlessly within Shopify’s ecosystem to serve hundreds of subscription brands and millions of subscribers. You’ll partner closely with Product, Design, and Engineering to deliver reliable, maintainable, and performant solutions that set us apart in the subscription ecosystem.

This is a high-impact role focused on execution, strong engineering craftsmanship, and collaboration — while also providing opportunities to influence architecture and technical direction.

In a typical day, you might:

Redesign the webhook processing architecture to support 10x growth.

Architect a new abstraction layer that decouples internal subscription models from Shopify order primitives.

Lead a technical deep-dive on Shopify GraphQL bulk operations and performance tradeoffs.

Write an RFC defining the next generation of Stay’s integration framework.

Review critical infrastructure PRs and guide engineers on distributed systems design.

Implement new APIs and services to unlock the next generation of subscription management and analytics features for merchants.

Design and develop internal tooling when you see opportunities to better enable yourself and other engineers.

Collaborate with your teammates on Eng, Design and Product Management to plan and execute on new projects.

What You’ll Bring:

4+ years of experience developing large-scale, resilient services with well-defined APIs that interact with synchronous and asynchronous data processing pipelines.

Experience with Nest.js and Kubernetes and supporting highly available and reliable cloud based services.

Experience defining API schemas and working with REST APIs to communicate with the server

Experience with AWS (Kubernetes, SQS, Postgres, RDS), including the application of security best practices.

Experience working with the Shopify platform and APIs, especially around subscription or recurring payments.

Experience leveraging AI tools to improve productivity and quality.

Ability to thrive in a dynamic startup environment, demonstrating adaptability, curiosity, and a willingness to take initiative.

A deep passion for crafting delightful experiences and learning new skills.

Excellent problem solving skills and the ability to effectively communicate complex concepts across cross-functional teams.

Nice to Haves

Experience working with Snowflake and dbt on high-volume data pipelines.

Prior experience mentoring or leading engineers.

Fullstack React experience. While this is a backend role, understanding how the frontend works is always a plus.

Why Join Us?

Make a meaningful impact at a high-growth startup

Work alongside exceptional Stayers who value rigor and velocity as well as serious fun

Solve complex, high-leverage problems that power hundreds of subscription brands

Learn from veteran platform engineers while solving complex, high-impact problems