Java software developer Jobs in Lowell, MA

Job#: 3012633

Job Description:

Location: Andover (Hybrid — once a week onsite minimum)

Clearance: Citizenship required. Ability to obtain Secret clearance.

Job Type: 1 Year Contract to Hire

Experience Level: 5–10 years

Position Summary

We are seeking a Full-Stack Developer with 5–10 years of professional experience in Java and ReactJS to support mission-critical software systems. The ideal candidate will design, develop, and maintain scalable web applications that integrate secure backend services with dynamic, responsive front-end interfaces. The role requires strong problem-solving skills, attention to detail, and the ability to collaborate effectively in a structured, security-conscious environment.

Key Responsibilities

·Develop, test, and maintain full-stack applications using Java (Spring Boot) and ReactJS.

·Design RESTful APIs and ensure secure, efficient communication between front-end and back-end components.

·Collaborate with UI/UX designers, systems engineers, and database administrators to implement robust software solutions.

·Participate in code reviews, integration testing, and deployment pipelines.

·Write clean, maintainable code adhering to project-specific security and coding standards.

·Troubleshoot and resolve issues across the stack to ensure application reliability and performance.

·Support migration of legacy applications to modern web architectures where required.

Required Qualifications

·5–10 years of experience in full-stack development using Java (Spring Boot) and ReactJS.

·Strong understanding of object-oriented programming, RESTful API design, and secure web application development.

·Proficiency with JavaScript, HTML5, CSS3, and modern frameworks such as Redux or

·Experience with relational databases (MySQL, PostgreSQL, or Oracle).

·Familiarity with Git, CI/CD tools, and Agile development practices.

· Citizenship (mandatory for access to defense-related systems).

Preferred Qualifications

·Experience in a DoD or aerospace/defense environment.

·Working knowledge of containerization and orchestration (Docker, Kubernetes).

·Familiarity with DevSecOps pipelines and secure coding practices.

·Experience integrating APIs with identity management systems (OAuth2, SAML, etc.).

Work Environment & Expectations

·May require working in secure facilities or with sensitive defense data systems.

·Flexibility to collaborate across time zones and travel occasionally for project needs.

·Adherence to project-specific documentation, cybersecurity, and compliance standards is mandatory.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.