Mid-Level Backend Engineer: High-Impact APIs & Data Systems

Leidos; St. Louis (MO); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos is hiring a Backend Software Engineer to support a high-visibility, data-driven application used across the organization for analytics and reporting. You will design, develop, and maintain core backend services in Java or Python, build RESTful APIs, and ensure reliability and performance in Linux environments to support mission stakeholders.

This role joins a high performing team changing how digital engineering and mission operations intelligence is enabled for our customer, with

Qualifications

• 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

Responsibilities

• Backend Development: Design, develop, test, and maintain backend application components using Java or Python
• REST API Development: Develop and maintain RESTful services to support application functionality and system integrations
• Object-Oriented Programming: Apply object-oriented design principles to build scalable and maintainable systems
• Database Development: Write and modify SQL queries to support application functionality and data retrieval
• Data Source Collaboration: Collaborate with internal and external teams to understand data sources, formats, and access methods, and support integration into backend systems
• Linux Environments: Develop and troubleshoot applications within Linux-based environments
• Data Processing & Business Logic: Implement backend logic for data transformation, processing, and system workflows
• Bug Fixing & Enhancements: Identify, debug, and resolve application-level defects and performance issues
• Code Quality: Follow coding standards, participate in code reviews, and support documentation efforts

Skills

Object-oriented programming

Java

Python

RESTful APIs

SQL

Linux

Independent work

Education

Bachelor's degree in Computer Science/Software Engineering or related field

Master's degree

Tools

Spring Boot

Django

Airflow

CI/CD (GitLab/Jenkins)

Docker/OpenShift

AWS/Azure

Job description

Leidos is hiring a Backend Software Engineer to support a high-visibility, data-driven application used across the organization for analytics and reporting. You will design, develop, and maintain core backend services in Java or Python, build RESTful APIs, and ensure reliability and performance in Linux environments to support mission stakeholders.

This role joins a high performing team changing how digital engineering and mission operations intelligence is enabled for our customer, with