Freelance Senior Full-Stack Dev (React + Rails) — Remote

Netenders

España

Remote

EUR 83,000 - 124,000

Full time

14 days+

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Job summary

Netenders, based in Barcelona, seeks a Senior Full Stack Developer (Freelance) to collaborate with the in-house team on long-term e-commerce CMS projects. You will architect scalable Rails backends and React frontends, focusing on supplier integrations and high-volume data flows.

You will work autonomously in a freelance capacity, with flexible remote options. Prior mentoring and sharing expertise to help internal teams grow are valued, alongside strong communication of complex technical

Qualifications

5+ years of experience with Ruby on Rails (v5+), including 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.

Responsibilities

Lead the technical evolution and optimization of the multi-brand e-commerce ecosystem.
Architect scalable React frontends and robust Ruby on Rails backend services.
Develop core CMS features focusing on complex supplier integrations and high-volume data flows.
Design high-performance APIs and back-office tools for pricing and SEO management.
Ensure code quality and architectural consistency through expert-level pull request reviews.
Collaborate with cross-functional teams to translate business requirements into clean, maintainable code.