Senior Full-Stack Engineer — Remote Federal Modernization

Jobs in JS; Alexandria (VA); Remote; USD 90,000 - 115,000; Full time

Job summary

LightFeather is seeking a Senior Full Stack Engineer to support a federal government client in modernizing critical mission systems. You will own full stack delivery, translating legacy behavior into clean, scalable software, remotely (EST hours). The role emphasizes experience with Java, Spring Boot, React, and RESTful APIs.

The environment includes large legacy systems and complex workflows. You will design, develop, and maintain applications, integrate legacy environments with modern

Qualifications

• Bachelor's degree in Computer Science or related field (or equivalent experience).
• 7+ years of hands-on full stack software development experience.
• Experience with Java and Spring Boot.
• Experience designing RESTful APIs and front-end technologies (React, HTML, and CSS).
• Experience with relational databases and data access patterns.
• Ability to troubleshoot across multiple layers of an application stack.
• Experience working in Agile or iterative delivery environments.
• Strong systems thinking and ownership mindset.

Responsibilities

• Design, develop, and maintain full stack applications supporting modernization of systems.
• Analyze legacy systems and workflows to identify core functionality vs. unnecessary process overhead.
• Translate operational requirements into scalable, modern application designs.
• Develop backend services, APIs, and integration layers connecting legacy environments to modern platforms.
• Build and enhance user-facing components using modern front-end technologies.
• Support the full SDLC: analysis, design, development, testing, deployment, and maintenance.
• Troubleshoot issues across application, integration, and data layers.
• Collaborate with stakeholders to clarify requirements and improve system behavior.
• Participate in code reviews and uphold engineering best practices.

Skills

Java

Spring Boot

React

JavaScript

HTML/CSS

RESTful APIs

SQL

Agile

Systems thinking

Education

Bachelor's degree in Computer Science or related field

Job description

LightFeather is seeking a Senior Full Stack Engineer to support a federal government client in modernizing critical mission systems. You will own full stack delivery, translating legacy behavior into clean, scalable software, remotely (EST hours). The role emphasizes experience with Java, Spring Boot, React, and RESTful APIs.

The environment includes large legacy systems and complex workflows. You will design, develop, and maintain applications, integrate legacy environments with modern