Senior Full Stack Engineer

ECS Federal • Work from home, VA

2d • $140,000 - $180,000 • Remote

About The Position

Everforth ECS is seeking a Senior Full Stack Engineer to work remotely on enterprise-level applications supporting the Department of Homeland Security. The role involves designing, building, and maintaining large-scale APIs, with a focus on migrating datacenter systems to a SaaS solution. The engineer will help rearchitect API infrastructure to improve scalability, reliability, and long-term maintainability, using Java, JavaScript frontend frameworks, Elastic and other data sources, and cloud DevSecOps practices.

The position also focuses on modernizing legacy systems, integrating React-based user interfaces with scalable APIs, and minimizing downtime and operational risks during migrations. The salary range is $140,000–$180,000. Applicants must be U.S. citizens and able to pass a Public Trust investigation.

Requirements

• Must be a U.S. citizen.
• Ability to pass a Public Trust investigation.
• Bachelor’s degree in a related field.
• At least 10 years of total work experience.
• At least 5 years of experience with Java 8 or later, including strong experience modernizing legacy systems.
• At least 8 years of experience with Python, including strong experience modernizing legacy systems.
• At least 5 years developing responsive web applications using React, Redux, and modern JavaScript.
• At least 5 years building RESTful microservices and service-oriented architectures.
• At least 3 years of experience with CI/CD pipelines and deploying or operating in AWS or Azure cloud environments.
• At least 3 years of experience with Spring Boot or other stateless Java frameworks.
• At least 3 years developing applications in production, troubleshooting complex issues in legacy environments, and proposing effective solutions.
• Solid understanding of Git, version-control workflows, and collaborative development practices.
• Familiarity with CX and UI/UX principles and their application in modern software design.
• Excellent communication skills, including the ability to explain technical challenges and solutions to non-technical stakeholders.

Responsibilities

• Support the design and architecture of robust, scalable APIs for large enterprise-level applications.
• Integrate and operate CI/CD pipelines used to build and release code and container images.
• Assess and refactor deprecated codebases, applying best practices for modernization and performance improvement.
• Collaborate with engineers to integrate React-based user interfaces with scalable APIs, enhance API interactions, support legacy system modernization, and ensure seamless functionality and an optimal user experience.
• Provide solutions for legacy system migration while minimizing system downtime and operational risks.
• Identify and resolve technical debt in older systems while transitioning them to modern Java frameworks and tools.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior