Mid-Level Backend Software Engineer

Leidos

Backend Software Engineer developing core backend services and RESTful APIs for data-driven analytics and reporting. Collaborating across teams to ensure system reliability and performance.

Posted 4/17/2026full-timeGaithersburg • Arizona, Colorado, Maryland, Montana, Virginia • 🇺🇸 United StatesMid-LevelSenior💰 $87,100 - $157,450 per yearWebsite

Tech Stack

Tools & technologies

JavaLinuxPythonSQLTypeScript

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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

Benefits

Comp & perks

competitive compensation
Health and Wellness programs
Income Protection
Paid Leave
Retirement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaPythonRESTful servicesSQLobject-oriented designLinuxdata transformationapplication debuggingperformance optimizationcoding standards

Soft Skills

collaborationindependenceproblem-solvingcommunicationattention to detail

Certifications

Bachelor’s degreeMaster’s degreeTS/SCI clearance