Java Mainframe Developer
Vienna , VA
Experience: 0
Category: Information Technology
Contractor Work Model: Remote
Brand: System One
Job ID: 350416
Date Posted: 05/06/2026
Shortcut: http://jobs.systemone.com/RD42rl
Job Title: Java Developer
Location: Remote
Type: Contract
Responsibilities
- Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on integrating distributed applications with the organization's Core Banking platform.
- Translate business and platform requirements into secure, scalable, and reliable solutions throughout the full software development lifecycle.
- Operate with minimal supervision while exercising strong technical judgment.
- Collaborate with Core Banking, testing, middleware, and platform teams to manage dependencies, mitigate risks, and meet aggressive delivery timelines.
- Design, develop, and optimize high-quality software applications using advanced programming languages and frameworks that meet business needs.
- Gather and analyze requirements, translate into technical specifications, propose solutions, and ensure timely task completion.
- Write clean, scalable, and maintainable code adhering to best practices and organizational standards.
- Implement data structures and algorithms efficiently to optimize performance and user experience.
- Identify, troubleshoot, and resolve application errors.
- Conduct code reviews, provide feedback, and learn from colleagues to maintain high-quality codebase.
- Lead small efforts, fostering relationships with stakeholders and team members.
- Contribute to development policies, standards, and procedures for applications and software.
- Continuously learn and improve through collaboration and feedback.
- Bachelor’s degree in Computer Science, Information Systems, or a related field, or equivalent experience.
- 0 or more years of experience in application or software development.
- Proficiency in software development principles, methodologies (including Agile), pipelines, and version control systems (Git and GitHub).
- Expertise in Java, XML, Open API, Maven, and ANT, with knowledge of modern frameworks and libraries.
- Strong understanding of web technologies and capacity to design scalable solutions.
- Excellent problem-solving, analytical, and troubleshooting skills.
- Effective written and verbal communication skills for technical and non-technical stakeholders.
- Experience with incident tracking, project management, and change control tools.
- Understanding of data structures and algorithms for application performance and scalability.
- Experience developing web services, microservices, REST and SOAP APIs, and implementing REST principles.
- Ability to write and maintain unit and integration tests and troubleshoot software defects.
- Familiarity with CI/CD pipelines and web APIs like Apache HTTP Client, JAX-WS, JAX-RS.
System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.
System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.
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Ref: #851-Rockville-S1
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