Freelance Senior Software Developer Jobs in Minnesota

Leidos is seeking Senior Software Developers to join the Air Traffic Business Area within the Homeland Sector, supporting the development of the Alaska Automation Capability (AAC). AAC is part of the FAA’s broader initiative to modernize legacy flight service systems, replacing aging infrastructure with a scalable, cloud‑based platform designed to improve safety and operational efficiency—particularly in remote and high‑dependency aviation environments like Alaska. AAC is a mission‑critical, future‑ready, cloud‑based solution providing safety‑critical flight services to the pilot community.

As a member of a Scaled Agile software development organization, you will contribute to the technical execution of a program that integrates proven, globally deployed technologies with modern cloud‑native capabilities. You will work alongside cross‑functional teams and technical leaders to deliver predictable outcomes in a highly regulated, safety‑critical environment.

In this position, you will design and implement software solutions independently while working closely with systems engineering, product delivery, and DevSecOps teams. The primary focus is on developing containerized applications within an Agile/SAFe environment. This position supports government programs and requires the ability to obtain and maintain a favorable Public Trust investigation.

• Responsible for software development activities both individually and as a member of a team including writing, testing, debugging, and maintaining source code within an Agile environment.
• Use AI-assisted development tools to accelerate coding, refactoring, debugging, and test creation.
• Develop solutions to complex issues and problems that impact multiple areas or disciplines.
• Actively participate in Agile scrum ceremonies and other related team activities.
• Troubleshoot and participate in the resolution of technical issues in lab and operational environments.
• Provide support as needed for system engineering, test engineering, and system owner teams.
• Communicate with internal team members across multiple areas and client team members. May communicate with parties external to the organization.

• Bachelor’s degree in Computer Science or a related field with 8–12 years of relevant experience, or a Master’s degree with 6–10 years of experience. May also possess a Doctorate.
• Expert knowledge of Java with substantial hands‑on programming experience
• Extensive experience with Web development and commonly used front‑end tools and languages (React, HTML, CSS, JavaScript)
• Extensive experience with unit testing tools such as Junit and Mockito
• Significant experience with RESTful API, JSON, XML, XSD
• Significant experience with Spring Framework, Spring Security, and Spring Boot
• Significant experience with Linux
• Significant experience with version control systems such as Git or Subversion
• Experience with common development tools and IDEs (Eclipse, VS Code, etc.)
• Experience working within the Agile Scrum framework
• Understanding of sound software development principles and practices
• Ability to effectively communicate verbally and in writing
• Ability to obtain SF‑85 Public Trust (Tier 2) suitability determination
• US citizenship required

• Experience with AI-assisted coding (Claude Code, Codex etc.)
• Experience with microservices and cloud‑based environments
• Knowledge of or experience with Python programming language
• Knowledge of or experience with Ansible playbooks and YAML
• Knowledge of or experience with Linux shell scripting
• Knowledge of or experience with MongoDB
• Knowledge of air traffic control and flight services

Pay Range: $107,900.00 – $195,050.00. The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement, or other law.

Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.