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

Job description

**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. ### Accountabilities - Design, develop, and evolve backend services using Kotlin and Spring, building REST and gRPC APIs and integrations with messaging systems such as Kafka and Amazon SQS. - Build and maintain modern web applications using Next.js, React, and TypeScript, following established frontend engineering standards and best practices. - Contribute across the full software development lifecycle, from product discovery and technical design to implementation, code review, testing, deployment, and production monitoring. - Develop scalable, maintainable backend architectures using principles such as Clean Architecture, Hexagonal Architecture, and Domain-Driven Design (DDD). - Ensure software quality through automated unit and integration testing, adequate test coverage, and reliable CI/CD pipelines. - Implement observability practices across services and applications, including metrics, logs, and distributed tracing, to support production reliability and performance monitoring. - Collaborate across engineering squads and disciplines to align technical solutions with product requirements and business objectives. - Conduct thorough code reviews, share technical knowledge, and mentor junior and mid-level developers to strengthen team capabilities. - Contribute to continuous improvement initiatives focused on application performance, scalability, maintainability, and development efficiency. ## Requirements - Strong professional experience as a senior FullStack Developer, with the ability to contribute confidently to both backend and frontend development. - Advanced knowledge of **Kotlin**, ideally with production experience using Spring. Strong Java experience combined with a clear willingness to work extensively with Kotlin may also be considered. - Solid backend development skills, including API design, data modeling, software architecture, and established engineering best practices. - Experience with architectural approaches such as Clean Architecture, Hexagonal Architecture, and Domain-Driven Design (DDD). - Hands-on experience with **Next.js, React, and TypeScript**, including server-side rendering (SSR), static site generation (SSG), data fetching, styling, and accessibility. - Experience with cloud platforms such as AWS or equivalent, containerization technologies, and CI/CD workflows. - Strong understanding of automated testing and a commitment to software quality throughout the development lifecycle. - Familiarity with relational and/or NoSQL databases and messaging technologies such as Kafka or Amazon SQS. - Strong analytical, problem-solving, and communication skills, with the ability to collaborate effectively across teams. - A proactive approach to technical challenges, code quality, knowledge sharing, and continuous improvement. **Nice-to-have qualifications:** - Previous experience in food technology, payments, fintech, or related industries. - Production experience with Kotlin and Spring Boot or Ktor. - Familiarity with Next.js App Router, React Server Components, and edge rendering. - Experience with observability platforms such as Datadog, service-level objectives (SLOs), and on-call practices. - Knowledge of event-driven architecture, Kafka-based systems, and high-scale applications. ## Benefits - **Healthcare coverage:** Health and dental insurance. - **Meal and food allowances:** Benefits to support everyday food expenses. - **Childcare assistance:** Financial support for eligible childcare needs. - **Extended parental leave:** Additional time and support for new parents. - **Health and wellness partnerships:** Access to fitness facilities and health and wellness professionals through programs such as Wellhub and TotalPass. - **Performance incentives:** Participation in a profit-sharing and results-based compensation program (PLR). - **Life insurance:** Coverage to support employees and their families. - **Continuous learning:** Access to a dedicated learning platform with professional development opportunities. - **Discount programs:** Access to a range of partner offers and discounts. - **Physical and mental well-being:** Access to an online platform dedicated to health and wellness. - **Parenthood support:** Courses focused on pregnancy and responsible parenting. - **Online learning resources:** Partnerships with online course providers. - **Language development:** Access to a language-learning platform. - **Inclusive workplace support:** Dedicated health and well-being professionals, inclusion specialists, and employee affinity groups. - **Accessibility and accommodations:** Support for candidates with disabilities throughout the recruitment process, including assistance with obtaining the required documentation when needed. - **Work arrangement:** The role is remote in Brazil. Candidates residing in the Campinas metropolitan area should note that office attendance is required under the applicable workplace attendance policy. - **Compensation details:** The specific salary range is not provided and should be confirmed during the recruitment process.