Senior Software Developer Fullstack - Kotlin/Next.js (React/TypeScript)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Developer Fullstack - Kotlin/Next.js (React/TypeScript) based in Brazil. This is a senior full-stack engineering role focused on building resilient, secure, and highly scalable digital products. You will work across Kotlin-based backend services and modern web applications built with Next.js, React, and TypeScript. The role offers end-to-end ownership, from product discovery and architecture through deployment, monitoring, and continuous improvement. You will contribute to APIs, event-driven integrations, cloud infrastructure, automated testing, and observability. As a technical reference, you will influence architectural decisions, conduct rigorous code reviews, and mentor less-experienced engineers. You will also leverage AI-powered development practices to improve engineering efficiency and raise the quality bar across the team. The environment is collaborative and cross-functional, with a strong focus on engineering excellence, scalability, and continuous learning.