Senior Full Stack Engineer: Enterprise API Modernization

ECS Corporate Services; Fairfax (VA); On-site; USD 130,000 - 160,000; Full time

Job summary

Everforth ECS is seeking a highly skilled Full Stack Engineer to design, build and maintain large-scale APIs for enterprise applications supporting DHS. You will work with Java (8+), Python, React and modern JavaScript to modernize legacy code bases while ensuring scalability and reliability.

You will integrate UI with APIs, manage CI/CD pipelines, and help migrate from legacy systems with minimal downtime. Strong communication and collaboration with cross-functional teams are essential.

Qualifications

• Bachelor's degree in a related field.
• 10+ years total work experience in software engineering.
• 5+ years with Java (8 and beyond) in modernizing legacy systems.
• 8+ years with Python with legacy modernization focus.
• 3+ years building RESTful microservices and SOA architectures.

Responsibilities

• Design and architect robust APIs for enterprise-scale applications.
• Integrate and operate CI/CD pipelines and containerized deployments.
• Refactor deprecated code bases to modern Java frameworks and tools.
• Collaborate with front-end teams to connect React UIs with scalable APIs.
• Migrate legacy systems with minimal downtime and reduced operational risk.
• Identify and resolve technical debt in older systems and improve performance.

Skills

Java

Python

React

Redux

Modern JavaScript

UI/UX familiarity

Git

RESTful microservices

SOA architectures

Cloud experience

Communication skills

Education

Bachelor's degree in a related field

Tools

AWS

Azure

CI/CD

Job description

Everforth ECS is seeking a highly skilled Full Stack Engineer to design, build and maintain large-scale APIs for enterprise applications supporting DHS. You will work with Java (8+), Python, React and modern JavaScript to modernize legacy code bases while ensuring scalability and reliability.

You will integrate UI with APIs, manage CI/CD pipelines, and help migrate from legacy systems with minimal downtime. Strong communication and collaboration with cross-functional teams are essential.