Mid-level Java Developer

Nuclea

full-time

Posted on: 10/14/2025

Location Type: Hybrid

Location: São Paulo • 🇧🇷 Brazil

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Mid-LevelSenior

AWSDynamoDBJavaJUnitKafkaLinuxMavenMockitoPostgresSpringSpring BootSpringBootSQL

About the role

Ensure the use of development best practices, including object-oriented programming, SOLID principles and design patterns to create scalable and maintainable solutions;
Design and implement microservices using Spring Boot and modern distributed architecture patterns;
Participate in system modernization, including migrating monolithic applications to AWS using managed services and refactoring strategies;
Manage the source code lifecycle, including versioning, code reviews and continuous integration, ensuring clean and well-documented code;
Implement automated tests (unit, integration and performance), and use tools such as SonarQube for code quality and security analysis;
Apply secure development practices, including vulnerability analysis and best practices to protect APIs and sensitive data;
Ensure application stability by fixing bugs, monitoring logs and applying continuous improvements;
Configure, maintain and optimize Linux-based development and production environments;
Use GitHub Actions for deployment automation and software lifecycle management;
Work with AWS services such as Lambda, API Gateway, RDS, S3, ECS, EKS, CloudWatch, among others, for deployment, scalability and observability of applications.

Bachelor's degree completed.
Java SE, Java EE;
Experience with Java 8 and later (experience with Java 21 is a plus), including Lambdas, Streams and the Date API, etc.;
Spring Framework;
Spring Boot, Spring MVC, Spring Data, Spring Security;
Building RESTful APIs and web services;
Microservices and software architecture;
Service communication patterns (REST, messaging — MQ and Kafka, event-driven);
Experience migrating monoliths to microservices on AWS is a plus;
PostgreSQL;
Data modeling, SQL and query optimization;
DynamoDB;
Infrastructure and DevOps;
Application servers: JBoss;
Linux: basic administration and scripting for automation;
Maven, Nexus, SonarQube: build management, repositories and code quality;
GitHub and CI/CD: experience with GitHub Actions and CI/CD pipelines;
Automated testing: JUnit, Mockito;
System security and communications;
Application security: encryption, digital certificates, banking protocols (SPB);
Web services: REST, JSON, XML, XSD;
File transfer: Connect Direct and CFT.

Benefits

Tip: use these terms in your resume and cover letter to boost ATS matches.

Java SEJava EEJava 8Spring FrameworkSpring BootMicroservicesRESTful APIsPostgreSQLAutomated testingApplication security

communicationproblem-solvingcollaborationattention to detailadaptability

Bachelor's degree