Full Stack Developer (Java & React)

Mbi Llc; Trenton (NJ); On-site; USD 120,000 - 180,000; Full time

Job summary

Mbi Llc in New Jersey is hiring a Senior Full-Stack Developer to own hands-on development and modernization of enterprise web apps. You will refactor legacy systems into modular microservices, build responsive front-ends with React, and implement CI/CD with automated tests.

The role requires strong Java/Spring Boot experience and Oracle SQL optimization, with a focus on scalable, cloud-ready solutions across the full stack.

Qualifications

• Senior full-stack developer responsible for hands-on development and lifecycle support.
• Experience refactoring legacy apps into modular microservices and cloud-ready services.
• Proficient across full stack, with emphasis on Java/Spring Boot and React.
• Strong DB skills including Oracle and SQL optimization.
• Experience with CI/CD and automated testing.

Responsibilities

• Application Modernization: refactor legacy Java apps into Spring Boot microservices and build front-end with React/Bootstrap.
• API & Database: design RESTful APIs and optimize Oracle SQL and schemas.
• Requirements & Design: translate business needs into clean technical implementations.
• Testing & Quality: perform JUnit/Mockito/React Testing Library checks for reliability.
• Deployment & Maintenance: manage builds and CI/CD pipelines and provide post-launch support.

Skills

System Refactoring / Monolith Moderniz

Relational Databases & Data Analysis

Oracle Database Management

RESTful API Development

Software Deployment & CI/CD Tooling

React

Spring Boot

Bootstrap

Education

Bachelors in Computer Science or related field

Tools

React

Spring Boot

Bootstrap

Job description

- Senior Full-Stack Developer responsible for the hands-on development, refactoring, and full-lifecycle support of enterprise web applications.

- This role balances day-to-day feature development with system modernization—decoupling legacy architectures into clean, modular, cloud-ready services.

- The developer works across the full software stack to deliver performant solutions, optimize existing database structures, and enforce engineering best practices through automated testing and clean CI/CD deployment workflows.

Key Responsibilities

- Application Modernization & Development: Refactor legacy Java applications into modular Spring Boot microservices while building responsive front-end components using React and Bootstrap.

- API & Database Engineering: Design secure RESTful APIs and execute database schema changes and performance tuning within relational databases (Oracle preferred).

- Requirements & Design: Convert complex business needs into clean, maintainable technical implementations while following departmental standards.

- Testing & Quality Control: Execute thorough developer-level testing using JUnit, Mockito, and React Testing Library to maintain system reliability.

- Deployment & Ongoing Maintenance: Manage application builds, deploy software through CI/CD pipelines, and provide post-launch operational support.

- Bachelors in Computer Science or related field required. LinkedIn Profile required.

Fill the skill matrix below:

Skill

Amount

Candidate's No. of years of experience

Required

10

System Refactoring / Monolith Modernization

Required

7

Required

7

Relational Databases & Data Analysis

Required

7

Oracle Database Management & SQL Optimization

Highly desired

7

Required

5

Required

5

RESTful API Development

Required

5

Required

5

Software Deployment & CI/CD Tooling

Required

5