Senior Full-Stack Engineer

Role Description

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.

Qualifications

• 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.

Requirements

• 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).

Benefits

• 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

Company Description

Javvy is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All employment decisions are made based on qualifications, merit, business needs, and applicable laws.