Senior Software Engineer, Platform

About Zenbundle

Zenbundle is an Enterprise Ireland–backed High Potential Start-Up. We help independent specialty retailers sell more online: running, footwear, pharmacy, electrical, toy and sporting goods stores across Ireland, the US and Canada, almost all of them on Shopify. We run shoppable video and retail media on their own stores, use AI to optimize their paid media, and power AI shopping assistants that know each retailer’s catalog. Increasingly, the service is agentic: AI agents do the routine work, and people approve what matters.

The opportunity

We’re hiring a senior engineer to help lead the development of the platform that powers our products.

You’ll work across the whole product, from our cloud infrastructure and data pipelines to the Shopify apps, AI features and agentic workflows behind our service. You’ll ship improvements, keep the platform fast and reliable as more retailers join, and shape how we build software as we grow. It’s a live product with paying customers. You’ll work directly with the CEO, and you’ll have a direct line to the merchants who use what you build.

This role is open to permanent or contract candidates, hybrid from our Dublin City office.

Who you are

• 4+ years building and running production web systems, with recent hands-on Python (FastAPI or similar, SQLAlchemy, Celery)
• Comfortable with production: you’ve been on call, debugged a live incident and shipped the fix
• Hands-on with AWS and Kubernetes, and infrastructure as code (Terraform)
• Solid TypeScript and React, enough to work across our Shopify apps and merchant dashboard
• Experienced with third-party APIs: OAuth, webhooks, rate limits, retries
• Independent and pragmatic, and good at explaining technical trade-offs to non-engineers
• You use AI coding tools such as Claude Code or Cursor day to day, and review what they produce with the same care as your own code

Nice to have

• Shopify app development (Admin GraphQL API, webhooks, app extensions, app review). A bonus, not a requirement
• Google Merchant Center or Google Ads API
• LLMs and agents in production: prompt testing, evaluation, guardrails, cost and latency, MCP
• Meta Marketing and Conversions APIs, Datadog or Cloudflare Workers

What you’ll do

• Build, deploy and operate services on AWS, with monitoring and alerting, and take part in on-call
• Develop our Shopify apps, including AI chat apps for different retail verticals: webhooks, authentication, extensions and app review
• Work on our commerce integrations: Google Merchant Center feeds, Google Ads, Meta and order attribution
• Improve our AI shopping assistant, including answer quality for retailers in regulated categories such as pharmacy
• Work across our agentic stack (LLMs, MCP, human-in-the-loop flows) and take new AI capabilities from prototype to production, with the guardrails that make them safe on customers’ systems
• Own code review and release practices, and strengthen automation, monitoring, testing in CI and secure-by-default practices

Why Zenbundle

You’ll shape a product merchants rely on every day, and your work will directly drive how independent retailers grow online. You’ll have real influence over our technical direction as we grow.

How to apply

Apply through LinkedIn. With your application, please include:

1. A production problem you solved: what broke, how you found it and what you changed afterwards
2. Your salary expectations, or your day rate if you would prefer a contract
3. Your notice period or earliest start date