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Senior Full-Stack Engineer at Exec. Our Mission: Scale Excellence. At Exec, we believe excellence should not be a rare achievement. It should be an everyday habit.. We exist to help companies scale excellence across their teams. We do this by combining the tireless precision of AI with the irreplaceable guidance of human expertise. Our platform gives employees real practice, real feedback, and real proof they can perform when it matters.. Our clients trust us with their most valuable asset — their people. We do not take that responsibility lightly.. If you are looking for work that matters, where quality is a moral duty and speed is a competitive advantage, you might be a fit.. The Role. We are looking for a Senior Full-Stack Engineer to join our small, senior team. You will own end-to-end feature development across our stack. You will help us deliver products that are as reliable and sharp as the teams we help build.. You must love building fast and building well. You must be energized by owning problems all the way from concept to deployed solution. You must care about testing your work thoroughly. Bugs erode the trust we work so hard to earn with our customers.. We are a company that expects craftsmanship, but not perfectionism. We believe the right way is the fast way that is also the right way.. What You Will Do. . Build high-quality, scalable front-end experiences in React and TypeScript. . . Build and maintain reliable back-end systems with Django and Python. . . Own the full development lifecycle. You will scope, build, test, deploy, and maintain the systems you create. . . Set a high bar for code quality, automated testing, and observability. . . Collaborate deeply with product managers, designers, and other engineers to create intuitive and durable products. . . Continuously improve our codebase, architecture, and engineering culture. . . Move fast without breaking trust. Catch problems before customers ever see them.. . . Five or more years building production SaaS applications. . . Expertise in TypeScript and React. You understand hooks, state management, testing libraries, and modern best practices. . . Expertise in Django and Python. You are comfortable with the ORM, GraphQL, and background task queues like Celery. . . A track record of taking full ownership of complex features or systems. . . Strong commitment to thorough testing. You believe catching bugs early is a professional obligation. . . Experience with modern DevOps tools like Docker and GitHub Actions. . . Clear and direct communication skills. You know how to give and receive feedback well. . . A bias toward action. You prefer delivering solutions over admiring problems.. . Nice to Have. . Experience working with large language models or real-time audio/video systems. . . Familiarity with education or training technology standards. . . Data visualization skills. . . Prior experience in a high-growth B2B SaaS company.. . Company Location: Argentina.