Desenvolvedor(a) Sênior Full Stack (Node.js / React) — PJ in Brazil at Jobgether

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Desenvolvedor(a) Sênior Full Stack (Node.js / React) — PJ based in Brazil.

We are looking for a senior full-stack developer to contribute directly to the evolution of a B2B SaaS product operating at scale. You will work on a production environment with high traffic, real-world external integrations, and strong requirements for performance, stability, and scalability. The role combines backend and frontend development with architecture, quality, and long-term maintainability. You will have autonomy to make technical decisions and contribute to solutions that support real business operations. Refactoring, architecture, observability, and continuous improvement are part of the day-to-day engineering culture. This is an opportunity for a hands-on professional who combines strong technical expertise with product vision and a sense of ownership.

• Develop, evolve, and maintain a B2B SaaS product using Node.js, NestJS, React, TypeScript, and PostgreSQL.
• Build scalable, reliable, and high-performance backend and frontend solutions designed for production environments.
• Design and implement well-structured application architectures, applying principles such as Clean Architecture, DDD, and TDD where appropriate.
• Develop and maintain integrations with external systems, including fiscal platforms, municipalities, RFB-related workflows, and other business-critical services.
• Contribute to the implementation and adaptation of fiscal integrations in response to changes introduced by the Brazilian Tax Reform.
• Identify opportunities for refactoring, technical improvements, and architectural evolution while maintaining application stability.
• Work with event-driven architectures and Spec-Driven Development practices when applicable.
• Contribute to CI/CD pipelines, cloud infrastructure, observability, logging, metrics, and production monitoring.
• Develop and maintain integrations with financial services such as PIX, boletos, and CNAB as needed.
• Leverage AI tools throughout the development lifecycle to improve productivity, quality, and engineering workflows.
• Collaborate with stakeholders and technical teams to translate business requirements into robust, maintainable solutions.
• Take ownership of delivered solutions and ensure that production code remains healthy, reliable, and aligned with product needs.

• Proven senior-level experience developing and maintaining production applications.
• Strong professional experience with Node.js and NestJS in production environments.
• Solid experience with React, with an emphasis on well-structured and maintainable applications.
• Advanced day-to-day experience with TypeScript.
• Strong experience working with PostgreSQL in real-world production scenarios.
• Previous experience developing or maintaining B2B SaaS products.
• Practical experience with Brazilian fiscal integrations, including NFSe, municipal systems, RFB-related flows, and the ability to adapt solutions to changes resulting from the Tax Reform.
• Experience applying software engineering practices such as Clean Architecture, DDD, and TDD.
• Knowledge of event-driven architecture and Spec-Driven Development.
• Experience using AI tools as part of the software development lifecycle.
• Experience building and maintaining CI/CD pipelines.
• Hands-on experience with AWS in production environments.
• Familiarity with observability practices, including logs, metrics, monitoring, and production troubleshooting.
• Experience with financial integrations such as PIX, boletos, and CNAB is a strong advantage.
• Strong autonomy, organization, communication, adaptability, and product-oriented thinking.
• A strong sense of ownership and accountability for technical decisions and delivered results.

• 100% remote work model.
• PJ contractor engagement.
• Monthly compensation of R$ 8,000.
• Education incentive through partnerships with educational platforms.
• Monthly Culture Package incentive that can be used for education and cultural activities.
• TotalPass benefit for physical activities, exercise, and other wellness modalities.
• iFood Office voucher for use within the app on your birthday.
• Opportunity to work on a production-scale B2B SaaS product with challenging technical and business requirements.
• High level of autonomy and exposure to modern software architecture, cloud, observability, automation, and AI-assisted development practices.