Java Backend Engineer - Onsite Interview required

System One; Vienna (VA); Hybrid; USD 83,000 - 124,000; Part time

Job summary

System One in Vienna, VA is seeking a Java Backend Engineer for a contract, long-term role with hybrid work (3 days onsite, 2 remote). The position requires strong Java (preferably Java 17+), Spring/Spring Boot, RESTful APIs, and cloud experience (Azure preferred).

On-site work in Vienna, VA with a 40-hour week. Responsibilities include designing and maintaining secure backend services, ensuring performance and reliability, and collaborating across teams.

Qualifications

• Strong Java experience, with Java 17+ or newer preferred.
• Spring, Spring Boot, web services, and RESTful APIs knowledge.
• Experience with JUnit and Mockito testing frameworks.
• Proficiency with Git and CI/CD tools (Maven, Docker, Jenkins, GitHub, Azure DevOps).
• Strong understanding of databases, SQL, and data integration patterns.
• Experience troubleshooting distributed systems and designing scalable microservices.
• Experience developing cloud-native applications, Azure preferred.
• Effective communication and collaboration skills.

Responsibilities

• Design, build, and maintain secure backend services and APIs for mobile, web, and partner systems.
• Focus on performance, reliability, observability, quality, and responsiveness.
• Collaborate with cross-functional teams to deliver technical solutions.
• Develop and maintain unit, integration, and automated tests.

Skills

Java 17+

Spring/Spring Boot

RESTful APIs

JUnit/Mockito

Git/CI-CD

Azure Cloud

Distributed Systems

Communication

Tools

Maven

Docker

Jenkins

GitHub

Azure DevOps

Git

Job description

Job Title: Java Backend Engineer
Location: Vienna, VA ONSITE INTERVIEW REQUIRED
Type: Contract, long term expected
Compensation:W-2 or C2C, H1B ok, no OPT
Work Model: Hybrid - 3 days onsite and 2 days remote
Hours: 40 hours a week

Responsibilities

• Design, build, integrate, and maintain secure backend services and APIs supporting mobile, web, enterprise, and partner systems.
• Design for performance, reliability, resiliency, observability, quality, and responsiveness.
• Collaborate with cross-functional teams to define, design, and deliver sustainable technical solutions.
• Develop and maintain unit, integration, and automated tests to support reliable delivery.
• Apply secure coding, data protection, and engineering standards.
• Troubleshoot production defects, performance bottlenecks, integration issues, and complex service dependencies.
• Refactor code and conduct peer reviews to improve security, quality, readability, and maintainability.
• Contribute to solution design, technical documentation, and proof-of-concepts that support architectural decisions.
• Support services across testing, deployment, production troubleshooting, and continuous operational improvement.
• Participate in Agile ceremonies and advocate for adaptive planning, automation, reusable solutions, and continuous improvement.
• Share knowledge and support the development of less experienced engineers.

Requirements

• Strong Java experience, with Java 17 or newer preferred.
• Solid knowledge of enterprise Java, Spring, Spring Boot, web services, and RESTful APIs.
• Experience with automated testing frameworks and practices, such as JUnit and Mockito.
• Proficiency with Git and CI/CD tools such as Maven, Docker, Jenkins, GitHub, or Azure DevOps.
• Strong understanding of databases, SQL, and data integration patterns.
• Experience troubleshooting distributed systems and designing scalable, resilient, observable microservices.
• Experience developing cloud-native applications, with Microsoft Azure strongly preferred.
• Effective communication, independent prioritization, and collaboration skills, including the ability to explain technical concepts to non-technical audiences.

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.

#M1 #LI-CB3

Ref: #851-Rockville-S1