Senior Full-Stack Developer (Java & React)

Job Title : Senior Full-Stack Developer (Java & React)
Location: 3 days/week onsite in Trenton, NJ
Duration: 12+ Months + probable extension
Rate: $45-47/hr on W2 or $55-57/hr on C2C or 1099- MAX
Local candidates only, Interview will be onsite
10+ years Java & React development experience, system refactoring, spring frameworks, relational databases.

Job Description

We are looking for a Senior Full-Stack Developer (Java & React) to design, develop, modernize, and support enterprise web applications for our client. This position will be a full-time contract and hybrid, requiring candidates to work onsite in the Trenton, NJ office three days per week.

What You’ll Do

• Refactor and modernize legacy Java-based applications into scalable, maintainable Spring Boot microservices
• Design, develop, and maintain responsive user interfaces using React, JavaScript, CSS, and Bootstrap
• Develop and consume secure RESTful APIs to support enterprise application integrations
• Analyze business requirements and translate them into technical solutions that align with standards and best practices
• Design, optimize, and maintain relational database structures, with a strong focus on Oracle database performance and SQL optimization
• Perform unit, integration, and component testing using JUnit, Mockito, and React Testing Library
• Troubleshoot application issues and provide production support for enterprise systems
• Implement software builds, deployments, and release management through CI/CD pipelines
• Collaborate with business stakeholders, analysts, architects, and development teams throughout the software development lifecycle
• Enforce coding standards, development best practices, and application security requirements
• Support application enhancements, bug fixes, and ongoing modernization initiatives
• Participate in code reviews, technical design discussions, and knowledge-sharing activities

What You’ll Need

Required:

• Bachelor’s degree in Computer Science, Information Technology, or a related field
• 10+ years of experience with Java development (Core Java and modern Java frameworks)
• 7+ years of experience with system refactoring and monolithic application modernization
• 7+ years of experience with Spring Framework technologies including Spring Boot, Spring MVC, and Hibernate
• 7+ years of experience working with relational databases and data analysis
• 5+ years of experience developing applications with JavaScript and React
• 5+ years of experience with CSS and Bootstrap
• 5+ years of experience designing and developing RESTful APIs
• 5+ years of experience performing developer-level testing using JUnit, Mockito, and React Testing Library
• 5+ years of experience with software deployment processes and CI/CD tooling
• Strong understanding of software development lifecycle (SDLC) methodologies
• Experience supporting enterprise-level web applications throughout the full application lifecycle
• Ability to work effectively in a hybrid team environment

Preferred:

• 7+ years of Oracle Database management and SQL performance optimization
• Experience with application modernization and cloud-ready architecture design
• Experience implementing microservices-based architectures
• Experience supporting public sector or education-related enterprise applications
• Strong analytical, troubleshooting, and problem-solving skills
• Experience working in Agile/Scrum development environments