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Senior Backend Developer (Ruby on Rails) at Workana. About the Role. We are looking for a . Senior Ruby on Rails Developer (Backend Focus). to join a talented international team and contribute to the development of a scalable platform that connects families with educational providers.. This is a . direct hire opportunity with the client’s payroll. , offering long-term stability and professional growth.. Responsibilities. . Design, develop, and maintain scalable backend solutions with Ruby on Rails. . . Solve complex technical challenges related to performance, concurrency, and distributed architecture. . . Lead technical initiatives and mentor other team members. . . Collaborate with cross-functional teams (Product, Frontend, DevOps) in an Agile environment. . . Participate in architectural decisions and support the migration of infrastructure to AWS. . . Contribute to improving scalability, reliability, and performance of the platform. . . . Proven experience with . Ruby on Rails in main projects in recent years. (not only side projects). . . Strong track record building and scaling . large, complex products. (high concurrency, millions of users, critical integrations). . . Expertise in . performance optimization, architecture design, and scalability. . . . Experience leading projects or technical teams in . e-commerce, marketplaces, or large-scale digital platforms. . . . General frontend knowledge (React, HTML, CSS, JavaScript) is a plus. . . . Advanced English (C1 or higher, mandatory):. you will work closely with international stakeholders. . . Current residence in Argentina (mandatory). . . Tech Stack. . . Languages:. Ruby, JavaScript, HTML, CSS . . . Frameworks:. Ruby on Rails, React (in some areas of the project) . . . Database:. PostgreSQL . . . Infrastructure:. Active migration to AWS . . . Methodology:. Agile . . Company Location: Argentina.