Senior Full-Stack JS Engineer - AI-Powered, Serverless TS

Relay Commerce, Inc.; Funchal; Remote; EUR 70,000 - 100,000; Full time

Benefits offered by this job

Flexible Time Off

Public Holidays Off

Paid Parental Leave

Work From Home Stipend

Therapy/Mental Health Reimbursement

Co-working Space Allowance

Company Swag

Job summary

Relay Commerce is seeking a Senior JavaScript Engineer to design and evolve TypeScript services powering replenishment, cross-sell, and subscriptions for Shopify stores. You’ll own features end-to-end, propose architecture, implement with AI assistance, and monitor live production systems.

A strong front-end contribution will also be expected in a fully remote, AI-driven environment. You will collaborate with a Senior Product Manager, leverage AI agents, and contribute to scalable, observable,

Qualifications

• 8+ years of senior JavaScript/TypeScript experience across multiple companies.
• Experience designing REST APIs for third-party integrations.
• Deep TS expertise with class-oriented design, strong typing, SOLID, and TDD.

Responsibilities

• Design and evolve serverless TypeScript services on AWS Lambda.
• Build React front-ends integrated with backend APIs.
• Own features end-to-end from idea to delivery with AI support.
• Ensure reliability, observability, security, and performance in production.
• Collaborate across a multi-disciplinary team including Product and SRE.

Skills

JavaScript

TypeScript

REST APIs

React

SQL/MySQL

AWS

DataDog

Shopify

AI/LLMs

Tools

AWS Lambda

Prisma ORM

Claude/Codex

Job description

Relay Commerce is seeking a Senior JavaScript Engineer to design and evolve TypeScript services powering replenishment, cross-sell, and subscriptions for Shopify stores. You’ll own features end-to-end, propose architecture, implement with AI assistance, and monitor live production systems.

A strong front-end contribution will also be expected in a fully remote, AI-driven environment. You will collaborate with a Senior Product Manager, leverage AI agents, and contribute to scalable, observable,