Sr Java Full Stack Developer

System One; Reston (VA); Hybrid; USD 123,984 - 144,648; Full time

Benefits offered by this job

Health benefits

Dental

Vision

Life insurance

401(k) plan

Job summary

System One seeks a Senior Java Full Stack Developer to migrate on‑prem services to AWS EKS while supporting an Angular frontend. The role is backend‑leaning (70% backend / 30% frontend) and requires strong full‑stack capabilities across REST, Java, and cloud platforms.

Hybrid work from Reston with periodic onsite meetings. The ideal candidate has 5+ years of SDLC experience, Java 17+ with Java 21 in use, Angular 18 or newer, and hands-on CI/CD, testing, and DevOps practices.

Qualifications

• Bachelor’s degree in IT/Computer Science or equivalent experience.
• 5+ years of software engineering across the SDLC (requirements, design, build, test, support).
• Full stack experience with a backend-heavy focus (70/30 backend/frontend).
• Java 17+ required (environment currently using Java 21).
• Angular 17+ required (currently on Angular 18).
• AWS is a hard requirement, including multiple years deploying and managing EKS.
• Experience migrating/replatforming services from on‑prem to AWS.
• Strong CI/CD, automated testing, agile delivery, and code quality standards.

Responsibilities

• Perform hands-on design, coding, testing, and support of complex enterprise applications at scale.
• Migrate and modernize Java REST services from on-prem to AWS EKS.
• Build and maintain Java web services and integration layers between UI and data sources.
• Contribute to the Angular front end as needed (UI contribution required).
• Work with MongoDB and Aurora PostgreSQL databases.
• Implement automated testing and quality practices (Playwright).
• Support CI/CD, code quality, and DevOps-aligned delivery standards.
• Provide production support and mentor junior engineers.

Skills

Java

Angular

AWS & EKS

REST APIs

CI/CD

Problem solving

Team mentoring

Education

Bachelor’s degree in IT/Computer Science

Tools

Playwright

MongoDB

Aurora PostgreSQL

REST services design

Job description

SR JAVA FULL STACK DEVELOPER (AWS / EKS / Angular)

Location: Hybrid - Reston, VA (20190) (90% remote - 4 to 6 onsite meetings a year)
Type: Contract
Schedule: 40 hours/week
Pay (W2): USD $97.00/hr

JOB OVERVIEW

We’re seeking a Senior Java Full Stack Developer to a strategic cloud modernization initiative (deliverables targeted through the end of 2026). This role is focused on replatforming/migrating existing services - moving Java REST services currently deployed on-prem into AWS (EKS) - while continuing to support a modern Angular front end.

This is a backend-leaning full stack role (70% backend / 30% frontend). Pure backend candidates won’t be a fit: the team needs engineers who can flex across the stack as priorities shift and who can demonstrate real front-end experience plus strong aptitude.

WHAT YOU’LL DO

• Perform hands‑on design, coding, testing, and support of complex enterprise applications at scale
• Help migrate and modernize Java REST services from on-prem to AWS EKS
• Build and maintain Java web services and integration layers between UI and data sources
• Contribute to the Angular front end as needed (this is not a UI‑only role, but UI contribution is required)
• Work with databases including MongoDB and Aurora PostgreSQL (similar enterprise DB experience is acceptable)
• Implement and execute automated testing and quality practices (including Playwright)
• Support CI/CD, code quality, and DevOps‑aligned delivery standards
• Provide production support, troubleshoot critical issues, and drive continuous improvement
• Participate in scoping/architecture conversations and mentor junior engineers as needed

REQUIRED QUALIFICATIONS

• Bachelor’s degree in IT/Computer Science (or additional relevant experience in lieu of degree)
• 5+ years of software engineering experience across the SDLC (requirements, design, build, test, and support)
• Full stack experience with a backend‑heavy focus (70/30 backend/frontend)
• Java 17+ required (environment currently using Java 21)
• Angular 17+ required (currently on Angular 18, targeting newer versions)
• AWS is a hard requirement, including multiple years deploying and managing EKS
• Experience migrating/replatforming services from on‑prem to AWS
• Strong experience with modern engineering practices: CI/CD, automated testing, agile delivery, and code quality standards

NICE TO HAVE

• AWS certifications (especially AWS Developer or AWS Solutions Architect) - highly preferable
• Experience with AWS AI/coding assistants (e.g., Amazon Q, Kiro) and an AI‑first engineering mindset

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.

Ref: #851‑Rockville‑S1

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Ref: #851‑Rockville‑S1