Netenders is an international e-commerce group based in Barcelona, operating several leading online stores in Europe and North America. As we continue to grow and innovate, we are developing our own cutting-edge e-commerce Content Management System (CMS) to revolutionize the online shopping experience across our brands. We are looking for a Senior Full Stack Developer (Freelance) to collaborate with our in-house tech team on high-impact, long-term projects.This is a freelance position, with versátil remote work (Barcelona-based candidates are a plus).Your Role: Leading the technical evolution and optimization of our multi-brand e-commerce ecosystem.Architecting scalable React frontends and robust Ruby on Rails backend services.Developing core CMS features,



specifically focusing on complex supplier integrations and high-volume data flows.Designing high-performance APIs and back-office tools for pricing and SEO management.Ensuring code quality and architectural consistency through expert-level pull request reviews.Collaborating with cross-functional teams to translate business requirements into clean, maintainable code.About you: You are a self-driven developer with a consultant mindset. You don’t just write code; you design solutions that consider the long-term health of the product. You enjoy the autonomy of freelance work but understand the importance of mentorship and sharing your technical expertise to help internal teams grow.Requirements: 5+ years of experience with Ruby on Rails (v5+), including successful version migrations.3+ years of professional experience building modern interfaces with React.Deep understanding of software design patterns and RESTful API architecture.Proven track record in e-commerce or handling complex, data-heavy backend systems.Strong proficiency with Docker and GIT-based workflows.Ability to work autonomously and communicate complex technical concepts clearly.Nice-to-have: Experience with Hotwire Native, ElasticSearch, Redis, or Googl

📌 Senior Full Stack Developer (Madrid)
🏢 Netenders
📍 Madrid