Fullstack AI Engineer for Shopify SaaS (Remote)

Upsellplus; New York (NY); Hybrid; USD 55,000 - 70,000; Full time

Job summary

UpsellPlus is seeking a skilled fullstack developer to own complete features across frontend, backend, data, and third‑party integrations. You will work directly with the CTO and have substantial ownership over what you build and how it reaches production.

This role requires delivering end‑to‑end features, including design, implementation, testing, release, and monitoring, with minimal overhead and strong customer focus.

Qualifications

• Experience delivering fullstack web applications in production.
• Experience with Shopify APIs, webhooks, themes, and checkout extensions is valuable.
• Ability to design, implement, test, release, and monitor features end-to-end.

Responsibilities

• Own complete features across frontend, backend, data, and integrations.
• Ship production features with testing, monitoring and rollback planning.
• Work closely with CTO and founder to align with customer needs and product goals.

Skills

Fullstack development

Shopify APIs

Webhooks

Themes

Checkout extensibility

App extensions

Merchant data

Job description

UpsellPlus is seeking a skilled fullstack developer to own complete features across frontend, backend, data, and third‑party integrations. You will work directly with the CTO and have substantial ownership over what you build and how it reaches production.

This role requires delivering end‑to‑end features, including design, implementation, testing, release, and monitoring, with minimal overhead and strong customer focus.