Senior Next.js (React/TypeScript) / Kotlin FullStack Developer

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Senior Next.js (React/TypeScript) / Kotlin FullStack Developer based in Brazil. We are seeking an experienced Senior FullStack Developer to design, build, and scale modern applications using Kotlin on the backend and Next.js, React, and TypeScript on the frontend. In this role, you will contribute to the entire software development lifecycle, from product discovery and architectural decisions to deployment and production monitoring. You will help build reliable, high-performing services and intuitive web experiences while maintaining strong standards for code quality, security, and accessibility. Working in a collaborative, cross-functional environment, you will partner with product teams and fellow engineers to deliver impactful technical solutions. You will also help strengthen engineering practices through code reviews, mentoring, automated testing, and observability. This opportunity is ideal for a senior engineer who combines hands-on technical expertise with a proactive mindset and a passion for continuous improvement.