This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Full Stack Engineer (Elixir Backend Focus) based in Brazil. Join an international, AI-first team building the infrastructure that connects loyalty programs and transforms reward points into a practical payment method. As a Full Stack Engineer with a strong backend focus, you will take ownership of core services, partner-facing APIs, and dashboards that support reliable loyalty transactions. You will work extensively with Elixir, Phoenix, PostgreSQL, React, and TypeScript to deliver scalable, secure, and well-documented solutions. From architecture and development to deployment, monitoring, and continuous improvement, you will contribute throughout the entire software lifecycle. AI-powered coding tools will be central to your daily workflow, helping you accelerate delivery while maintaining high standards of code quality and system correctness. Collaborating closely with product and infrastructure teams, you will help strengthen a platform where reliability, clear technical reasoning, and continuous learning are essential.