[Job-30394] Senior Fullstack Developer (Java / React), Brazil

CI&T; United States; Remote; USD 120,000 - 160,000; Full time

Benefits offered by this job

Health and dental insurance

Meal and food allowance

Childcare assistance

Extended paternity leave

Partnership with gyms and health and/w

Profit Sharing and Results PARTICIP

Job summary

CI&T is seeking a Senior-Master Full-Stack Developer to design, build, and support enterprise-scale web applications and microservices. You’ll work with React on the frontend and Java 21 / Spring Boot on the backend in an Agile environment.

You’ll collaborate across UX/UI, product, architecture, and QA teams to ensure secure, performant solutions, including OAuth2, OIDC, JWT, and robust monitoring. Remote-friendly EST work hours are common.

Qualifications

• Solid experience with full-stack development.
• Strong hands-on experience with React, modern JavaScript (ES6+), DOM APIs, and JSON.
• Proficient in backend development with Java, including older versions, and Spring Boot; recent hands-on experience required.
• Experience with microservices and enterprise integration patterns.
• Solid experience with RDBMS (MySQL or similar) and SQL.
• Good understanding of web security standards including JWT, authentication, and other security concepts.
• Excellent problem-solving, debugging, and communication skills.
• Candidates should demonstrate a structured approach to problem-solving and clarity in communication.
• Comfortable working in the EST time zone.
• Production support experience, including a strong understanding of application error handling and standard practices.

Responsibilities

• Design, develop, unit test, and integrate full-stack application components.
• Build scalable web applications using React frontend and Java 21 / Spring Boot backend.
• Implement RESTful APIs, microservices, and integrations with enterprise systems.
• Collaborate with UX/UI, product, architecture, and QA teams within an Agile environment.
• Create and maintain architecture, design, and system documentation.
• Ensure code quality, performance, and security (OAuth2, OIDC, JWT).
• Work with MySQL, Hibernate, Spring Data, and Spring Security.
• Provide production support and participate in on-call rotation; monitor and troubleshoot applications.

Skills

Full-stack development

React.js

Java/Spring Boot

Microservices

SQL/MySQL

Web security JWT

Problem solving

Communication

EST timezone

Production support

Tools

Hibernate

Spring Data

Spring Security

Job description

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’re looking for a talented Senior-Master Full-Stack Developer with strong expertise in React and Java (Spring Boot). You’ll play a crucial role in designing, building, and supporting enterprise-scale web applications and microservices that are performant, secure, and user-centric.

What You’ll Do:

• Design, develop, unit test, and integrate full-stack application components.

• Build scalable web applications using React on the frontend and Java 21 / Spring Boot on the backend.

• Implement RESTful APIs, microservices, and integrations with enterprise systems.

• Collaborate with UX/UI, product, architecture, and QA teams within an Agile environment.

• Create and maintain architecture, design, and system documentation.

• Ensure code quality, performance, and security, including OAuth2, OIDC, and JWT.

• Work with MySQL, Hibernate, Spring Data, and Spring Security.

• Support production systems using Kibana and APM tools, and participate in on-call rotation when needed. Demonstrated experience in monitoring and troubleshooting applications is essential.

What We’re Looking For:

• Solid experience with full‑stack development.

• Strong hands‑on experience with React, modern JavaScript (ES6+), DOM APIs, and JSON.

• Proficient in backend development with Java, (including old versions), and Spring Boot; recent hands‑on experience is required.

• Experience with microservices and enterprise integration patterns.

• Solid experience with RDBMS (MySQL or similar) and SQL.

• Good understanding of web security standards including JWT, authentication, and other security concepts.

• Excellent problem‑solving, debugging, and communication skills;

• Candidates should demonstrate a structured approach to problem‑solving and clarity in communication.

• Comfortable working in the EST time zone.

• Production support experience, including a strong understanding of application error handling and standard practices.

Nice to Have:

• Familiarity with micro‑frontend architecture and component libraries (e.g., Storybook, styled‑components).

• Knowledge of event‑driven architecture and Kafka; experience is preferred.

#LI-TO1

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.