Senior Full-Stack Engineer (Ruby on Rails + React)

**🚀 Senior Full\-Stack Engineer (Ruby on Rails \+ React)** **🌎 Remote \| ⚙️ Full\-Time (40\+ hrs/week) \| 🔥 Fast\-Growth Startup \| 💼 Contract or Contract\-to\-Hire** **We are a fast\-growing, VC\-backed retail audit \& execution platform that helps brands diagnose planogram compliance and optimize merchandising and category management workflows. Our tools connect real\-world retail execution with an intelligent analytics backend powered by data, video workflows, and CVAI.** **We’re a small, highly collaborative, and fast\-moving team. You’ll work directly with founders, technical leadership, and product teams — influencing architecture decisions, shaping internal tools, and contributing to high\-impact product areas.** **🧩 What You’ll Work On** **Key Responsibilities:** **Core Product Development:** * Build and maintain data\-driven dashboards using Ruby on Rails \+ React * Develop backend logic, algorithms, and data pipelines in Rails * Improve and expand internal Admin tooling for operations, analytics, and sales * Work on backend components powering the mobile app used by field shoppers Ensure consistency between mobile data flows and dashboard experiences. **Collaboration \& Code Quality:** * Work closely with the CTO to ensure backend data is translated into clean, functional UX * Communicate timelines, tradeoffs, and constraints to non\-technical founders * Provide thoughtful code reviews for junior developers Mentor junior developers on architecture and best practices (not people management) **Platform \& Infrastructure:** * Build and integrate APIs between internal systems and external services * Work with third\-party tools (marketing automation, payments, workflow systems) * Improve performance, maintainability, and reliability across the codebase * Identify and fix bugs across frontend, backend, web, and mobile * Write unit tests and elevate testing best practices over time * Maintain clean, well\-structured, well\-documented code **🎯 What We’re Looking For** * Must Have 5–8\+ years of full\-stack engineering experience * Strong proficiency with Ruby on Rails (backend, APIs, logic, data flows) * Strong proficiency with React (frontend features, UI state, components) * Experience working across the stack: backend services, APIs, frontend, and internal tools * Ability to work with both new systems and existing/legacy code * Experience with data handling, scaling, and performance optimization * Startup mindset: adaptable, fast, independent, detail\-oriented Strong communication skills, especially with non\-technical stakeholders * Experience reviewing code and mentoring junior developers * Bonus Skills React Native AWS Background jobs (Sidekiq, queues, workers) Data modeling or data pipeline experience **💡 Who Thrives Here You’re a builder at heart.** You enjoy owning full features end\-to\-end — backend logic, data models, UI, APIs, integrations, dashboards, internal tools.  You like fast\-moving environments where engineering decisions directly impact the roadmap. You're comfortable collaborating with both technical and non\-technical founders.  If you want the chance to build core product DNA in an early\-stage company, this role is for you. **We Offer** * Opportunities to work on diverse and challenging projects; * Flexible working conditions; * A supportive and collaborative team environment. * 12 vacation days per year; * 5 sick days per year; * English classes. * Access to psychologist support for mental well\-being.