Mid-Level Backend Software Engineer

The role of Mid-Level Backend Software Engineer at Leidos focuses on designing, building, and maintaining backend services, REST APIs, and data-driven logic within a Linux environment. The core team operates from Gaithersburg, MD with onsite support across multiple cities, and this position is based onsite in Tucson, AZ.

Location

Tucson, AZ (onsite)

Salary

USD 87,100 - 157,450 per year

Responsibilities

• Design, develop, test, and maintain backend components using Java or Python
• Develop and sustain RESTful services to support application functionality and system integrations
• Apply object oriented design principles to create 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
• Adhere to coding standards, participate in code reviews, and support documentation efforts

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, 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

Technologies

• Java
• Python
• RESTful APIs
• SQL
• Linux
• Apache Airflow
• Spring Boot
• Django
• GitLab
• Jenkins
• Docker
• OpenShift
• AWS
• Azure

Benefits

• Competitive compensation
• Health and Wellness programs
• Income protection
• Paid leave
• Retirement benefits

Why this role stands out

• High impact: Contributes to a widely used application that informs real time decision making
• High visibility: Works with engineering teams and mission stakeholders across programs
• Career growth: Deepens expertise in backend development, API design, and scalable systems
• Challenging work: Engages with complex backend features beyond routine maintenance