[Remote] Senior Full- Stack Engineer, Shopify & E-Commerce
Note: The job is a remote job and is open to candidates in USA. Javvy Coffee is a better-for-you beverage company expanding from a direct-to-consumer brand into an omnichannel business with major retail growth. The Senior Full-Stack Engineer will build and maintain Shopify and custom ecommerce systems, including frontend and backend applications, checkout and subscription flows, experimentation infrastructure, analytics, and production quality processes.
Responsibilities
- 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
Skills
- 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
- 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
- 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
- Full-time, fully remote, EST working hours, US-based.
- 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 Overview