[Job-00024] Senior Fullstack Engineer, Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.

With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.

We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.

We are looking for a Senior Full-stack Engineer to help evolve a web application, build reliable enterprise integrations, and scale document processing capabilities.

In this role, you will work across front-end and back-end development, translating design specifications into high-quality user experiences while developing versioned APIs and scalable processing workflows. You will contribute to integrations with enterprise platforms such as SAP S/4HANA and Ivalua, helping deliver robust and maintainable solutions.

Responsibilities

• Rebuild and enhance the web application based on the Design team's mockups, using Next.js, React, and TypeScript.
• Develop user-facing features, including PDF grounding views that help users review and validate information extracted from documents.
• Design, develop, and maintain versioned APIs using Python and Django REST Framework.
• Build and maintain integrations between Pegasus, SAP S/4HANA, and Ivalua, ensuring reliable data exchange across systems.
• Scale asynchronous batch processing with Celery to support workloads involving up to 10,000 PDF documents.
• Work with PostgreSQL to support application data management and persistence.
• Implement user metrics to provide insights into application usage and support data-driven improvements.
• Ensure application quality through automated testing, code reviews, documentation, and engineering best practices.
• Identify and resolve performance bottlenecks across the application, APIs, integrations, and background processing workflows.
• Collaborate with design, product, and engineering teams to deliver scalable solutions aligned with business needs.

Requirements for this challenge

• Strong professional experience in full-stack software development.
• Hands-on experience with Next.js, React, and TypeScript.
• Strong proficiency in Python and experience developing APIs with Django REST Framework.
• Solid knowledge of PostgreSQL, including data modeling and database interactions.
• Experience building and maintaining RESTful APIs and integrating external enterprise systems.
• Experience with asynchronous task processing and background jobs, particularly Celery.
• Understanding of scalable application architecture, performance optimization, and reliable data processing.
• Experience translating design mockups into responsive, user-friendly interfaces.
• Knowledge of software testing, version control, code reviews, and maintainable coding practices.
• Strong analytical and problem-solving skills.
• Ability to collaborate effectively with cross-functional teams and take ownership of technical solutions.

Nice to Have

• Experience integrating with SAP S/4HANA and procurement or enterprise platforms such as Ivalua.
• Experience processing large volumes of documents, particularly PDFs.
• Familiarity with document preview, annotation, grounding, or validation interfaces.
• Experience implementing product analytics, user metrics, and usage tracking.
• Knowledge of cloud-based deployments, CI/CD pipelines, and application observability.
• Experience improving the performance and reliability of distributed processing workflows.

#LI-GP1 Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; - Profit Sharing and Results Participation (PLR); -Life insurance - Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here. This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.