Senior Software Engineer (Java/GraphQL)

Following the acquisition of Tooploox, a premier AI and product development company, Confidencial (Apenas para Cadastrados) now offers true end-to-end delivery—from strategic advisory and solution design to custom AI development and enterprise-scale implementation. Our capability centers combine deep technical expertise, proven delivery methodologies, and sector-specific knowledge to address complex business challenges quickly and effectively.

We are looking for a Senior Software Engineer with experience in Java, GraphQL, and Kafka clusters to join our team. The ideal candidate will have experience developing scalable Java applications.

About the project: We are developing a data retrieval and operations platform for a next-generation customer support system for a global e-commerce leader. The platform will provide a federated GraphQL interface that unifies access to multiple backend services, enabling low-latency, real-time data retrieval and transactional operations to support AI-driven workflows.

The role will focus on designing, building and optimizing the platform to ensure scalability, reliability and test automation. This is a multi-team, collaborative initiative that requires close coordination with other delivery teams, adherence to high engineering standards and a strong focus on integration and architectural alignment.

What you will do:

• Develop and maintain the server-side logic of our applications using Java
• Implement efficient and performant backend code for high-volume production applications
• Monitor application health, identify related risks, and ensure reliability in production environment
• Contribute to all phases of the development lifecycle, from concept to deployment
• Review and refactor code, establishing best practices for code hygiene and organization

Experience and skills you need to join us:

• 5+ years of backend development experience in Java and Spring Framework
• Proficient in RESTful API design, experience with GraphQL APIs
• Experience with message brokers (e.g., Kafka, RabbitMQ, ActiveMQ) and caching (e.g., Redis, Memcached)
• Proficient with authentication and authorization mechanisms, especially OAuth 2.0
• Experience with containerization and orchestration tools like Docker and Kubernetes
• Knowledgeable in performance troubleshooting, profiling, and debugging tools
• Capable of solving complex challenges related to latency, data consistency, and performance in distributed systems
• Understanding patterns of distributed systems design; resilience patterns such as circuit breakers, retries, and timeout
• Proficient with code versioning tools, such as Git
• Skilled in CI/CD tools and practices
• English: B2+ (Written and Oral)
• Experience working in a lean agile process
• Proactive approach in understand the customer’s business and refining business requirements into technical requirements

It would be great if you also have:

• Experience with API contract testing
• NoSQL (e.g., MongoDB, Cassandra)
• Prompt engineering and experience with integration of GenAI LLMs into productions (ideally) or pet projects at least (OpenAI, Azure OpenAI, Bard, Llama)
• Familiarity with federated Graph architectures
• Experience mentoring less experienced colleagues is a strong advantage
• Team leader experience is a strong advantage
• Hands-on experience with Google Cloud Platform
• ReactJS experience

The ideal candidate would have:

• Strong communication skills with experience in direct customer interactions.
• Ability to engage with clients on technical issues, gather requirements, manage expectations and provide updates on project status
• Ability to learn quickly, adapt to new technologies, and perform tasks independently
• Passion for writing clean, efficient, and maintainable code (and encouraging others to do so)

When you join Confidencial (Apenas para Cadastrados), you'll…

• Shape real-world AI-driven projects across key industries, working with clients from startup innovation to enterprise transformation.
• Be part of a global team with equal opportunities for collaboration across continents and cultures.
• Thrive in an inclusive environment that prioritizes continuous learning, innovation, and ethical AI standards.

Ready to make an impact?

If you're excited to build things that matter, champion responsible AI, and grow with some of the industry’s sharpest minds. Apply today and let’s innovate together.