Junior Java Microservices Developer Jobs in Wisconsin

Position: Junior Java Developer

Experience: 1–4 Years
Employment Type: Full-Time

Job Summary

We are seeking a highly motivated Junior Java Developer with 1–3 years of professional experience in designing, developing, and maintaining enterprise-grade Java applications. The ideal candidate should have hands-on experience with modern Java technologies, backend development frameworks, RESTful APIs, relational databases, and version control systems. The candidate will collaborate with cross-functional teams to build scalable, secure, and high-performance applications while following industry best practices and software development standards.

Key Responsibilities

• Develop, test, and maintain robust Java-based backend applications using Java 8/11/17 and the Spring Boot framework.

• Design and implement RESTful APIs for integration with web, mobile, and third-party applications.

• Participate in application architecture discussions and contribute to technical design decisions.

• Write clean, reusable, and well-documented code following SOLID principles and design patterns.

• Optimize application performance, scalability, and reliability through efficient coding practices.

• Develop database objects, write complex SQL queries, and optimize database performance.

• Collaborate with UI developers, QA engineers, DevOps teams, and business analysts to deliver high-quality software.

• Perform unit testing, integration testing, debugging, and root cause analysis of production issues.

• Participate in code reviews to ensure coding standards, maintainability, and security compliance.

• Work with Git for source code management and CI/CD pipelines for automated deployment.

• Create technical documentation, API specifications, and deployment guides.

• Support production releases, monitor application performance, and resolve application defects within SLA timelines.

• Continuously learn and adopt new technologies, frameworks, and development methodologies.

Required Technical Skills

• 1–4 years of professional experience in Java application development.

• Strong proficiency in Core Java, including Collections, Multithreading, Exception Handling, Generics, Streams, and Lambda Expressions.

• Hands-on experience with Spring Boot, Spring MVC, Spring Data JPA, and Spring Security.

• Experience developing RESTful web services using JSON and HTTP protocols.

• Knowledge of Hibernate/JPA ORM frameworks.

• Strong understanding of Object-Oriented Programming (OOP), Design Patterns, and SOLID principles.

• Experience with relational databases such as MySQL, PostgreSQL, Oracle, or SQL Server.

• Ability to write optimized SQL queries, stored procedures, joins, indexes, and views.

• Experience with Git, GitHub, or GitLab for version control.

• Familiarity with Maven or Gradle build automation tools.

• Basic knowledge of Docker, Kubernetes, and cloud platforms such as AWS, Azure, or Google Cloud.

• Understanding of CI/CD tools including Jenkins, GitHub Actions, or Azure DevOps.

• Knowledge of messaging systems such as Kafka or RabbitMQ is an advantage.

• Familiarity with unit testing frameworks such as JUnit and Mockito.

• Basic understanding of Microservices architecture and API Gateway concepts.

• Knowledge of application security practices including authentication, authorization, and OWASP guidelines.

Preferred Qualifications

• Bachelor''''s degree in Computer Science, Information Technology, Software Engineering, or a related discipline.

• Experience working in Agile/Scrum development environments.

• Strong analytical, debugging, and problem-solving skills.

• Excellent communication and collaboration abilities.

• Ability to work independently while contributing effectively within a team.

• Exposure to SonarQube, Swagger/OpenAPI, Redis, Elasticsearch, or monitoring tools is considered an added advantage.

Key Competencies

• Backend Application Development

• REST API Development

• Microservices Development

• Database Design and Query Optimization

• Performance Tuning

• Code Quality and Best Practices

• Debugging and Troubleshooting

• Secure Coding Practices

• Agile Software Development

• Continuous Integration and Continuous Deployment (CI/CD)

Nice to Have

• Experience with containerized application deployment.

• Exposure to event-driven architecture.

• Knowledge of caching frameworks and distributed systems.

• Understanding of software performance monitoring and logging tools.

• Familiarity with Test-Driven Development (TDD) and Behavior-Driven Development (BDD).

What We Offer

• Opportunity to work on enterprise-scale applications and modern Java technologies.

• Collaborative and innovation-driven work environment.

• Professional growth through technical mentorship and training.

• Exposure to cloud-native development, DevOps practices, and scalable architecture.

• Career advancement opportunities based on technical expertise and performance.