[Job-31173] Senior/Master Fullstack Developer (Python/React), 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 or Master Full Stack Developer who can take product requirements, design the technical solution, and build it. You will own features end to end on a cloud enterprise platform: backend services, APIs, integrations, and React interfaces that support complex business workflows. You will also support the live project — investigating issues, fixing bugs, and keeping the platform running. This role uses AI intensively in day-to-day work, with judgment: you decide when it helps, review the output, and remain accountable for the result. What you will do: - Work with product to understand requirements, then design and implement the solution; - Build backend services in Python and frontend applications in React; - Design and maintain REST APIs, data contracts, and integrations with external systems; - Build resilient systems (async processing, retries, fault tolerance); - Contribute to the design system, reusable components, and Storybook; - Use PostgreSQL, Temporal, Docker, and AWS Bedrock; - Write tests, follow accessibility standards, and keep the UI maintainable; - Investigate and fix bugs in production and in development; - Add observability with OpenTelemetry and Grafana; - Work with Terraform and GitHub Actions for CI/CD; - Contribute to architecture decisions and help raise engineering standards; - Use AI tools heavily to speed up design, coding, and troubleshooting — always with review and sound engineering judgment. Required Qualifications: - Advanced English; - Hands-on production experience with both backend and frontend technologies; - Python (production), REST APIs, Docker, API Gateway, PostgreSQL; - Event-driven / async processing, message queues, workflow orchestration (e.g. Temporal); - GitHub Actions, observability (OpenTelemetry, Grafana, or similar); - React, JavaScript or TypeScript, HTML/CSS, responsive UI, REST integration; - Storybook, frontend testing with Playwright, Git; - Knowledge of Terraform and design systems; - Ability to turn product requirements into a technical design and working software; - Distributed systems, resilience patterns, auth (OAuth, OIDC, SSO, RBAC); - Production troubleshooting and bug fixing, accessibility, clear communication; - Comfortable using AI as a core part of the workflow, with the judgment to validate, correct, and own the output. Nice to Have: - AI/LLM integrations, enterprise SaaS, Jest/Cypress, design systems at scale, cloud frontend deploys, mentoring. #LI-TO1