Full-Stack Engineer (Lead Product Engineer)

Activate Talent; Pakistan; Remote; PKR 8,479,000 - 16,959,000; Full time

Job summary

A marketing agency specializing in e-commerce is looking for a full-time independent contractor to build an AI-powered Marketing Intelligence Layer. You will be responsible for developing a robust web application that integrates with Shopify and Klaviyo. The ideal candidate has a strong background in full-stack development, experience with APIs, and knowledge of marketing KPIs. This position allows for remote work.

Qualifications

• 3–5 years building production SaaS applications with multi-tenant architecture.
• Experience with API integrations and marketing KPIs.

Responsibilities

• Design, develop, and maintain the main app (front-end + back-end).
• Integrate with Shopify Admin API, Klaviyo API, and future partner APIs.
• Implement data ingestion flows and user authentication (OAuth 2.0).
• Build dashboards and insight views that deliver actionable recommendations.
• Work closely with the CTO and AI team to implement API endpoints for LLM interaction.
• Set up CI/CD pipelines, testing, and documentation.

Skills

React

Next.js

TypeScript

TailwindCSS

Node.js

Express

PostgreSQL

Docker

AWS

Shopify GraphQL Admin API

Klaviyo REST API

Tools

GitHub Actions

Job description

Type: Full-time | long-term independent contractor Reports to: CTO Location: Remote / (EST, CST) time zone

About the client

A marketing agency specializing in e‑commerce growth and conversion optimization, they help brands streamline the customer journey to boost sales and lifetime value. Their services focus on improving site conversion, reducing cart abandonment, and increasing repeat purchases through targeted creative and technical strategies. With an emphasis on data‑driven impact, they present clear metrics like higher conversion rates, more repeat buyers, and stronger LTV growth.

About the role

You’re the one in charge to build and scale the first production version of our AI‑powered Marketing Intelligence Layer for Shopify brands. You’ll turn prototypes into robust, secure, and fast web applications that integrate deeply with Shopify, Klaviyo, and future MarTech tools.

Responsibilities

• Design, develop, and maintain the main app (front‑end + back‑end)
• Integrate with Shopify Admin API, Klaviyo API, and future partner APIs
• Implement data ingestion flows and user authentication (OAuth 2.0)
• Build dashboards and insight views that deliver actionable recommendations
• Work closely with the CTO and AI team to implement API endpoints for LLM interaction
• Set up CI/CD pipelines, testing, and documentation

Required Skills & Experience

• Frontend: React, Next.js (or Remix), TypeScript, TailwindCSS
• Backend: Node.js + Express or NestJS, PostgreSQL (via Prisma ORM)
• DevOps: Docker, GitHub Actions, AWS (Lambda, ECS, or Amplify)
• Integrations: Experience with Shopify GraphQL Admin API and Klaviyo REST API
• Data: Understanding of marketing KPIs (LTV, CAC, ROAS, retention); 3–5 years building production SaaS applications with multi‑tenant architecture
• Bonus: Experience with Stripe Billing, Auth0, or Supabase Auth

What Success Looks Like

• V1 of the product deployed to real Shopify stores
• <1s API response time for recommendations
• Stable connection with Shopify/Klaviyo even under heavy usage