Integrations Engineer

About the product:

Our client is a US-based product company building a lifecycle marketing platform for ecommerce brands: behavioral event tracking, on-site personalization, and email/SMS automation. Integrations are the front door of the product, not a side feature.

The role:

You will own the layer connecting ecommerce platforms and third-party marketing tools to the product: building and maintaining connectors (Shopify, Adobe/Magento, Meta, Zapier), keeping data syncs (customers, orders, products, reviews, opt-ins) fast and reliable, and shipping the merchant-facing apps that install the tracking.

Tech stack:

• Go & Node.js microservices (chi, Express, gRPC, MongoDB, PostgreSQL).
• Embedded Shopify app: TypeScript, Remix on Cloudflare Workers, Polaris; platform plugins for WooCommerce & Adobe/Magento (PHP), Zapier (JavaScript).
• Event pipeline: Kafka, GCP Pub/Sub, protobuf contracts; Kubernetes (GKE) + Helm.
   

Responsibilities:

• Build and maintain platform connectors: OAuth install flows, webhook subscriptions, HMAC signature validation, rate-limited API clients, ETL-style backfills.
• Extend the connector registry with new third-party integrations (review platforms, subscription apps, ESPs, ad platforms) using schema-driven configuration.
• Keep high-volume webhook ingestion and queue-based sync workers healthy: idempotency, retries, backpressure; monitoring with Prometheus, Sentry, OpenTelemetry.
• Ship merchant-facing install and settings UIs in the connector dashboard.
• Debug production issues across platform APIs in a multi-tenant environment.
   

Requirements:

• 4+ years of backend engineering with real production experience integrating third-party APIs.
• Strong English speaking skills.
• Strong Node.js/TypeScript plus working Go (or strong Go plus working Node).
• Hands-on experience with at least one major ecommerce platform API, ideally Shopify (Admin GraphQL API, webhooks, app OAuth, embedded apps).
• Event-driven systems: message queues (BullMQ, Pub/Sub, Kafka or similar), worker patterns, rate limiting, idempotent processing.
• Auth for integrations: OAuth 2.0, JWT, webhook HMAC verification.
• MongoDB or PostgreSQL, Redis, Docker, Kubernetes deployments.
• Clear written communication and the judgment to work autonomously in a small team.
   

Nice to have:

• Marketing/ESP APIs (Klaviyo, Mailchimp), review platforms (Yotpo, Okendo), or subscription platforms (Recharge, Stay Ai, Ordergroove).
• PHP (WordPress/WooCommerce or Adobe/Magento 2 module development).
• gRPC and protobuf, schema-first API design.
• Cloudflare Workers, Remix or Next.js, Shopify Polaris.
• GCP (Pub/Sub, Cloud Run, GCS, Dataflow) and Helm.
• Zapier or similar iPaaS integration development.
• Experience building with LLMs: prompting, agentic workflows, evaluating and iterating on model output.
   

How the team works:

Small team, high ownership, minimal process. You will ship to production in your first weeks and own your services end to end, including observability and on-call for what you build, with your scope expanding as fast as you are ready for it.
 

LLM agents (Claude/Codex) are a first-class part of how the team works: agentic workflows encode the shape of a connector (auth, sync, webhooks, error handling) and specialize it per platform. Comfort collaborating with LLMs is part of the job.