Mid-Level Backend Software Engineer

Leidos•Gaithersburg, MD

8d•Onsite

About The Position

This role is for a Mid-Level Backend Software Engineer who has experience in backend development, object-oriented programming, and mission-driven engineering. The engineer will support a high-visibility, data-driven application used across the organization for analytics and reporting. Responsibilities include building and maintaining core backend services, developing RESTful APIs, supporting data-driven functionality, and contributing to system enhancements within a Linux-based environment. The work directly supports system reliability, performance, and data accuracy for mission stakeholders. The primary development team is in Gaithersburg, MD, with support for onsite engineers in Chantilly, VA, Alexandria, VA, Aurora, CO, St. Louis, MO, and Tucson, AZ. This position offers high impact, high visibility, career growth opportunities, and challenging work on complex backend features.

Requirements

Bachelor’s degree in Computer Science, Software Engineering, or a related field with 4–8 years of experience; or a Master’s degree with 2–6 years of experience
US Citizenship
Active TS/SCI with the ability to successfully pass a Polygraph
Professional experience developing object‑oriented applications in Java or Python
Hands‑on experience building and maintaining RESTful APIs
Basic to moderate experience with SQL capability, including writing queries and working with relational databases
Working knowledge of Linux‑based environments
Ability to work independently on defined tasks within established technical frameworks and deliver reliable results

Nice To Haves

Experience with Apache Airflow or similar workflow orchestration technologies
Experience with Spring Boot, Django, or similar backend frameworks
Exposure to CI/CD pipelines (GitLab, Jenkins, etc.)
Familiarity with containerization (Docker, OpenShift)
Exposure to cloud environments (AWS or Azure)
Experience working in Agile development environments

Responsibilities

Design, develop, test, and maintain backend application components using Java or Python
Develop and maintain RESTful services to support application functionality and system integrations
Apply object-oriented design principles to build scalable and maintainable systems
Write and modify SQL queries to support application functionality and data retrieval
Collaborate with internal and external teams to understand data sources, formats, and access methods, and support integration into backend systems
Develop and troubleshoot applications within Linux-based environments
Implement backend logic for data transformation, processing, and system workflows
Identify, debug, and resolve application-level defects and performance issues
Follow coding standards, participate in code reviews, and support documentation efforts