Job Information
System One Backend Developer in Merrifield, Virginia
Job Title: Mid/Senior Java Backend Developer
Location: Vienna, VA
Work schedule: Hybrid, onsite 2-3 days a week
Pay Rate: Open to Both W2 and established 1099/IC options
Position Type: Multiyear Contract
LOCAL CANDIDATES PREFERRED
Mid/Senior Back End Java Engineer will focus on building cloud-based, microservices-driven banking systems, with responsibilities spanning development, architecture, DevOps integration, and technical mentorship. Candidates must have a minimum of 7 years of recent, hands on Java development (versions 17+) and Spring/Spring Boot framework s.
Description:
Seeking a mid-to-senior Back-End Java Engineer to design, develop, test,
integrate, and maintain back-end services and digital systems that support mobile and online banking platforms. This role partners closely with analysts, QA testers, front-end engineers, and cross-functional teams to deliver secure, scalable, and high-quality solutions. The engineer works with minimal supervision on complex initiatives, provides technical direction, and coaches less experienced engineers. A strong commitment to collaboration, thoughtful system design, and sustainable, maintainable code is essential.
Key Responsibilities
• Design, build, and maintain back-end services and APIs supporting mobile and web applications
• Ensure performance, reliability, quality, and responsiveness of services
• Collaborate with cross-functional teams to define, design, and deliver new features
• Analyze, identify, and resolve system bottlenecks, defects, and integration issues
• Refactor and improve existing code to enhance readability, reduce complexity and improve maintainability
• Conduct peer code reviews to ensure adherence to design standards and quality expectations
• Coordinate integration of new solutions with existing applications and platforms
• Participate in Agile ceremonies including daily scrums and planning sessions
• Create proof-of-concepts and architecture documentation to evaluate proposed solutions
• Advocate for adaptive planning, continuous improvement, and automation
• Contribute to knowledge sharing and mentoring of less experienced engineers
Must have - minimum 7 years of:
Java and Spring/Spring Boot
Azure DevOps
Microservices
Qualifications/Skills
• Strong experience with Java (Java 17 and higher)
• Solid understanding of J2EE, web services, and RESTful APIs
• Experience with Spring and Spring Boot frameworks
• Proficiency with source control tools (Git preferred)
• Experience with CI/CD pipelines and related tools (e.g., Maven, Docker, Jenkins, GitHub)
• Strong understanding of databases, SQL, and data integration patterns
• Experience troubleshooting distributed and interconnected systems
• Knowledge of microservices architectures and application scalability
• Experience developing cloud-native applications (Microsoft Azure strongly preferred)
• Familiarity with AI-assisted development tools to improve productivity and code quality
• Awareness of sustainable coding practices and efficient system design
Desired
• Effective written and verbal communication skills, including the ability to explain technical concepts to non-technical audiences
• Knowledge of banking or financial services industry standards and practices
• Experience working in Agile environments and cross-functional teams
• Ability to manage multiple priorities independently or within a team
• Strong analytical, problem-solving, and system design skills
• Experience with data engineering, analytics, and visualization tools (Power BI preferred)
• Knowledge of data management, data migration, and performance optimization concepts.
Hours
• Schedule: Monday-Friday, 8:00 AM-4:30 PM
System One, and its subsidiaries including Joulé, ALTA IT Services, 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.
Ref: #851-Rockville-S1
System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services 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 full-time 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.