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Senior Fullstack Developer (RoR + React) at Workana. We are looking for a . Senior Fullstack Developer. with strong expertise in . Ruby on Rails. and proven experience in . React.js. . This is a long-term, full-time role where you will contribute to the development of a scalable marketplace platform with a clear social impact.. You’ll be part of an international team, collaborating directly with global stakeholders, and will play a key role in building new features, integrating third-party services, and improving application performance.. . . 5+ years of experience with Ruby on Rails. in production environments. . . . 2+ years of hands-on experience with React.js. in production. . . Strong knowledge of PostgreSQL and cloud environments (AWS is a plus). . . . Advanced English – C1 or higher (mandatory). to interact with international stakeholders. . . Current residence in . Argentina. (mandatory). . . Strong problem-solving skills, attention to detail, and focus on high-quality code. . . Responsibilities. . Design, develop, and maintain scalable web applications using . Ruby on Rails. . . . Build and optimize . modern user interfaces. with . React.js. . . . Create and integrate . REST APIs. and third-party services. . . Ensure clean, maintainable code through testing and debugging. . . Collaborate in an . Agile. environment with distributed teams. . . Participate in code reviews, contribute to architectural decisions, and propose improvements. . . Tech Stack. . . Languages:. Ruby, JavaScript, HTML, CSS . . . Frameworks:. Ruby on Rails, React.js . . . Database:. PostgreSQL . . . Infrastructure:. AWS (active migration) . . . Methodology:. Agile . . Company Location: Argentina.