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Sr Backend Engineer (Node.js) at Workana. We are building a new, large-scale . multi-tenant healthcare platform. designed for therapists to manage and document session notes securely and efficiently.. The product is currently in development (not a migration), with . Figma designs already completed. and a Flutter-based frontend in place. The system is being architected for scalability and long-term growth, with plans to expand the backend team after the first successful hire.. This is a high-impact opportunity to shape the backend architecture of a healthcare application from an early stage while collaborating directly with technical and business stakeholders.. About the Role. We are looking for a . Senior Backend Developer. to partner closely with the frontend lead (Flutter).. You will be the primary backend expert, working on a multi-tenant architecture and contributing to key decisions around scalability, performance, and infrastructure.. This role requires strong autonomy, clear communication skills, and comfort interacting directly with internal stakeholders such as supervisors and coordinators.. The development approach is . design-driven. , prioritizing product clarity and execution over strict adherence to Agile or Waterfall frameworks.. Key Responsibilities. Design and implement a scalable . multi-tenant backend architecture. . Develop and maintain APIs using . Node.js and Nest.js. . Work with . Prisma. as the ORM layer . Architect and manage cloud infrastructure in . AWS. . Set up and maintain . CI/CD pipelines. . Ensure best practices in security, performance, and maintainability . Collaborate closely with the frontend developer (Flutter) . Contribute to architectural decisions and backend standards . Communicate directly with internal stakeholders to clarify requirements and ensure alignment . Strong experience with . Node.js + Nest.js. . Experience working with . Prisma. . Proven experience with . AWS. (architecture-level understanding preferred) . Experience implementing and maintaining . CI/CD pipelines. . Ability to work independently with high ownership . Experience in the . healthcare, education, or medical industry. . Fluent English (written and spoken) . Experience contributing to architectural decisions in complex systems . Nice to Have. Experience working alongside Flutter teams . Experience designing multi-tenant systems from early-stage architecture. What Success Looks Like. You take ownership of backend development and proactively propose scalable solutions. . You collaborate effectively while working autonomously. . You help lay the technical foundation for future backend hires. . You bring clarity to architectural decisions in a regulated industry environment. . Company Location: Brazil.