Senior Full Stack Engineer

Javvy is on a mission to set a new standard for café favorites with better-for-you beverages that are craveable, convenient, and without compromise. Positioned at the intersection of café culture, convenience, and functional nutrition, we’re reimagining the drinks people buy every day — proving you don’t have to compromise between great taste and quality ingredients. What began as a cult-favorite DTC brand has rapidly scaled into an omnichannel business, now expanding into major retail while building a loyal community around better-for-you café favorites. 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 Equal Opportunity Employer 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. This job description is not intended to be an exhaustive list of duties, responsibilities, or qualifications and may be modified as business needs evolve.