Senior Full-Stack Engineer, Shopify & E-Commerce, Remote Job

The Opportunity We're hiring a Senior Full-Stack Engineer to help us build that engine faster, cleaner, and with fewer surprises after launch. This is a true full-stack role — spanning Shopify, custom frontend/backend systems, checkout and cart flows, subscriptions, experimentation infrastructure, tracking, and AI-assisted engineering workflows. It's built for someone who's already owned this kind of work as a Senior Full-Stack Engineer, Shopify/Ecommerce Engineer, or Lead Engineer at a DTC brand or agency, and wants to do it with more ownership and less red tape. What You’ll Own

• 40% — Shopify, cart, checkout, and ecommerce funnel work
• 25% — Custom web apps and services (React, Next.js, occasionally Vue)
• 15% — Cloudflare Workers, reverse proxy, and split-testing infrastructure
• 10% — Recharge / subscription and customer portal work
• 10% — QA, release process, code review, and technical standards

What You’ll Do

• Build and maintain high-quality ecommerce experiences across Shopify and our custom infrastructure
• Work with Shopify APIs, product/variant data, cart behavior, checkout constraints, and webhooks
• Ship frontend experiences in React, Next.js, and occasionally Vue
• Build backend services, integrations, and internal tools
• Extend our Cloudflare Workers and reverse-proxy/split-testing infrastructure
• Support A/B testing and experimentation across the ecommerce funnel
• Improve subscription experiences — Recharge/customer portal flows, cancellations, product swaps, rebill logic, and retention features
• Implement and validate tracking across experiments, attribution, and analytics (Amplitude, Elevar, PostHog, server-side tracking, or similar)
• Use AI coding tools as leverage — to move faster, explore approaches, debug, and check your own work
• Own pre-launch QA for high-impact launches: pricing tests, checkout changes, subscription changes, tracking updates
• Catch edge cases before customers or the business do, and monitor launches after release
• Communicate early and clearly — especially when something's risky, under-scoped, or likely to break

What You Bring Required

• Production experience with Shopify — Admin API, Storefront API, webhooks, product/variant/cart/checkout logic
• Strong React and/or Next.js, plus TypeScript or strong modern JavaScript
• Node.js (or similar) backend experience and solid API design chops
• Comfort integrating third-party APIs, using Git/GitHub PR workflows, and owning production deployments
• A track record of debugging production issues and building software that's fast, reliable, and maintainable
• Sound judgment using AI dev tools — as an accelerant, not a substitute for engineering fundamentals

Strongly Preferred

• Recharge or a similar subscription platform (Skio, Stay.ai, Smartrr, Ordergroove, Loop, etc.)
• Subscription flows: skips, delays, swaps, rebills, save offers
• Shopify Functions / Checkout Extensibility
• Cloudflare Workers, reverse proxies, or edge infrastructure
• A/B testing or experimentation systems
• Ecommerce analytics and tracking tools (Amplitude, Elevar, PostHog, server-side tracking)
• Performance optimization for high-traffic ecommerce pages
• Building internal tools for ecommerce, ops, or catalog management
• Real, hands-on experience with AI-assisted coding workflows (Cursor, Claude Code, GitHub Copilot, ChatGPT, or similar)

What Success Looks Like

• Ecommerce launches ship faster, with fewer post-launch fire drills
• High-impact Shopify, checkout, subscription, and tracking work needs less manual oversight from the CTO
• A/B tests, pricing changes, and checkout updates are implemented cleanly and measured correctly
• AI tools boost velocity without ever lowering the quality bar
• The rest of the engineering team levels up from working alongside you

Who Thrives Here

• You ship quickly without being sloppy, and you test your own work before handing it off
• You think in edge cases, not just happy paths — because you know ecommerce bugs cost real revenue
• You can take a business problem, not just a polished ticket, and run with it
• You push back — clearly and early — when something's risky or under-specified
• You debug deeply instead of guessing, and you leave every system better than you found it
• You care about conversion and customer experience as much as clean code
• You raise the bar for everyone around you

How We Think About AI We believe AI is a serious engineering advantage when it's used well. We want someone who uses it to explore approaches faster, write boilerplate, generate tests, debug, and review code — not someone who ships code because it appeared to work once. You should be able to look at AI-generated code and know immediately whether it's wrong, insecure, unscalable, or under-tested. No vibe coding. Use AI aggressively — but keep your engineering judgment firmly in the driver's seat. Logistics

• Full-time, fully remote, EST working hours, US-based
• Strong written and verbal English communication
• Comfortable in a fast-moving startup environment where priorities shift fast

Why This Role Rocks

• Competitive Salary
• 100% Company-Paid Health, Dental, Vision & Life Insurance for employees (Family coverage available at employee cost)
• 401(k) Retirement Plan
• Parental Leave
• Free Access to Javvy Products
• Career Growth Opportunities
• Collaborative, Fast-Paced Start-Up Environment