Job Summary: We are seeking a dynamic and proactive professional to drive the modernization of technical ecosystems by migrating systems and strategically advancing technological evolution. Key Highlights: 1. Strategic involvement in modernizing technical ecosystems 2. Connecting technology, business, and results 3. Collaborative and data-driven environment Are you a dynamic, proactive, data-driven professional with a genuine desire to create impact? **Arara Tech**, the technology unit of Grupo Guanabara, is looking for a **Senior Fullstack .Net (C#) Developer** to play a strategic role within the **Smart Travel unit**, connecting technology, business, and results. Here, technology is not support—it is the engine of transformation, efficiency, and innovation. **About Arara Tech** Arara Tech is the technology unit that connects, integrates, and empowers Grupo Guanabara. We operate cross-functionally, unifying systems, data, processes, and people to transform business challenges into efficient, intelligent, and sustainable solutions. We are the bridge between business and the future. And we build this future with methodology, purpose, and real impact. **Role Overview:** You will be responsible for modernizing our technical ecosystem, leading the strategic migration of the Smartbus system (.NET/C#) to Hermes (Golang). Your challenge will be to decouple functionalities from a robust monolithic structure into a scalable microservices architecture, ensuring technological advancement and performance for the Smart Travel BU. **Responsibilities and Duties** * Develop and maintain robust applications using .NET (C#), Go, and related technologies; * Participate in analysis and definition of technical and functional requirements; * Implement solutions in monolithic and distributed architectures; * Develop RESTful APIs and integrate with external systems; * Collaborate on SQL Server database design and optimization; * Conduct unit and integration testing to ensure code quality; * Participate in code reviews and share knowledge with the team; * Identify and resolve performance and scalability issues; * Document technical solutions and development processes; * Collaborate with QA, DevOps, and other technical teams. **Requirements and Qualifications** * Extensive experience developing with .NET (C#, ASP.NET Core, JavaScript, TypeScript, Angular); * Solid experience with monolithic systems and distributed architectures; * Knowledge of RESTful API development; * Strong expertise in SQL Server (administration, optimization, and development); * Experience with both SQL and NoSQL databases; * Proficiency in version control using Git; * Knowledge of unit and integration testing; * Experience applying design patterns and SOLID principles; * Familiarity with Agile methodologies; * Strong analytical capability to decompose complex problems and propose technical solutions—even in low-definition or ambiguous scenarios. **Preferred Qualifications:** * Experience with cloud platforms (AWS, Azure, GCP); * Knowledge of containerization (Docker, Kubernetes); * Proficiency in an additional programming language (Go, Python); * Experience with CI/CD tools; * Knowledge of Event-Driven Architecture; * Experience with caching technologies (Redis, Memcached); familiarity with DevOps principles. **Additional Information** **For your well-being, we offer:** * PJ contract model * 13th-month salary * Paid vacation (30 days) * Flexible Meal Allowance (flexible for other expenses) * Health insurance with co-payment (SulAmérica) * Performance-based bonus (PLR) **Additionally, for your experience, we provide:** * Collaborative and data-driven environment * Flexible working hours * Casual dress code * Continuous learning and real business challenges **Why work at Arara Tech?** * Purpose-driven technology with real impact * Close proximity to business operations and strategic decision-making * Opportunity to drive transformation from within a large group * Culture of collaboration, data-driven practices, and continuous evolution At Arara Tech, technology and business advance together—and people sit at the heart of this transformation. **Interested?** Then join us in building the future of mobility. **Embark on this journey with Arara Tech!** **Who We Are** Arara Tech is the technology unit that connects, integrates, and empowers Grupo Guanabara. Here, technology is not support—it is strategy, the engine of transformation, and an accelerator of results. We operate cross-functionally, connecting systems, data, processes, and people to transform business challenges into efficient, intelligent, and sustainable solutions. We are the bridge between business and the future. And we build this future with methodology, purpose, and real impact. **Our Purpose** Transform technology into results, innovation into efficiency, and data into intelligent decisions. At Arara Tech, we view Grupo Guanabara as a strategic internal client. We listen, understand, and deliver solutions that generate value, strengthen competitiveness, and continuously drive digital transformation.