Full Stack Engineer

Crystal Equation Corporation; Ridgefield Park (NJ); On-site; USD 100,000 - 130,000; Full time

Job summary

A technology solutions provider in Ridgefield Park, NJ is seeking a Senior Java Full-Stack Developer with over 9 years of experience in Java development. This role involves leading Java application development, supporting existing Android Mobile Applications, and ensuring operational stability. Candidates should have strong expertise in Java and Spring frameworks. Familiarity with DevOps practices is preferred. This position offers the opportunity to work on innovative technologies in a collaborative environment.

Qualifications

• 9+ years of professional experience in Java Full-Stack application development.
• Ability to support and maintain existing Android Mobile Applications.
• Experience in application operations and incident support.

Responsibilities

• Lead and perform Java Full-Stack application development.
• Design and enhance backend services using Java, Spring, and Spring Boot.
• Provide operational support for existing Android Mobile Applications.

Skills

Java

Spring / Spring Boot

RESTful API design

Incident support

Android development (junior)

Education

Bachelor’s degree in Computer Science or related field

Tools

CI/CD tools

Monitoring tools

Job description

Overview

This role primarily focuses on Java-based Full-Stack application development, while also requiring the ability to support, maintain, and modify existing Android Mobile Applications.

The ideal candidate is a senior Java Full-Stack developer who can understand Android mobile application codebases and perform basic modification, build, and deployment tasks to ensure service continuity and operational stability.

Responsibilities

• Primary Responsibilities – Java Full-Stack Development: Lead and perform Java Full-Stack application development as the primary responsibility
• Design, develop, and enhance backend services using Java, Spring / Spring Boot
• Support existing Java-based services and develop future enhancements based on business requirements
• Secondary Responsibilities – Android Mobile App Support: Provide operational support and maintenance for existing Android Mobile Applications
• Understand Android application architecture and source code
• Perform minor code changes, bug fixes, build, and deployment for Android applications
• Support incident handling and troubleshooting related to Android mobile services
• Operations & Service Stability: Provide application-level operational support for both Java and Android systems
• Participate in incident response, root cause analysis, and corrective actions
• Ensure system stability, service continuity, and reduced operational risk
• Knowledge Continuity & Collaboration: Maintain technical documentation and support knowledge transfer
• Collaborate with cross-functional teams to ensure smooth operations and enhancement delivery

Qualifications

• Required Qualifications: Bachelor’s degree in Computer Science, Engineering, or a related field (or equivalent experience)
• 9+ years of professional experience in Java Full-Stack application development
• Strong expertise in:
• Java, Spring / Spring Boot
• RESTful API design and database integration
• Experience in application operations, maintenance, and incident support
• Android Experience Requirements (Support-Oriented): Ability to understand existing Android Mobile App source code
• Experience or capability to:
• Modify existing Android code (Kotlin and/or Java)
• Build and package Android applications
• Perform deployment and operational support tasks
• Senior-level Android development experience is NOT required
• Junior-level Android skills are acceptable, as long as the candidate can independently support maintenance, build, and deployment
• Preferred Qualifications: Experience supporting enterprise-scale or production-critical systems
• Familiarity with DevOps practices, CI/CD pipelines, and monitoring tools
• Experience working in cloud or hybrid infrastructure environments
• Background in both development-focused and operations-focused roles
• Key Competencies: Strong ownership mindset for application stability and service continuity
• Effective problem-solving and incident response skills
• Clear communication with technical and non-technical stakeholders
• Ability to prioritize Java Full-Stack development while handling Android support needs