INTERNSHIP DETAILS

Software Engineer Intern

CompanyModern Technology Solutions Inc
LocationSt. Louis
Work ModeOn Site
PostedJanuary 15, 2026
Internship Information
Core Responsibilities
The Software Engineer Intern will collaborate with developers to design and implement software features for modeling and simulation tools. They will also assist in developing scripts for data processing and contribute to the maintenance of existing software applications.
Internship Type
full time
Company Size
2179
Visa Sponsorship
No
Language
English
Working Hours
40 hours
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About The Company
Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and technology solutions company delivering first-choice capabilities to solve problems of global importance in the critical mission areas of missile defense, cyber security, intelligence, unmanned/autonomous systems, aviation, space, and homeland security. The MTSI mission is to make important and lasting contributions to the nation's defense and security by providing leadership and best- value solutions to solve America's most technically challenging strategic problems. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide. For more information about MTSI, please visit www.mtsi-va.com. For current MTSI job openings, please visit www.mtsi-va.com/careers.
About the Role
Modern Technology Solutions currently looking for an Software Engineer Intern to join our team in St. Louis, MO. Responsibilities: Modern Technology Solutions, Inc. (MTSI) is seeking a Software Development Intern to support the development and enhancement of tools and models that assist in Department of Defense (DoD) analysis studies. You will work alongside software developers and analysts to create and optimize software solutions for mission-level simulations and modeling applications. Your essential job functions will include but may not be limited to: ·        Collaborating with other developers to design and implement new software features for modeling and simulation tools. ·        Developing scripts and tools to automate data processing and post-processing tasks for analysis studies. ·        Assisting in the development and testing of models that replicate systems or concepts for military applications. ·        Contributing to the maintenance and optimization of existing software applications, including debugging and performance improvements. ·        Supporting customer decision-making by developing presentations and reports that process and visualize output data. ·        Supporting the creation of general-purpose tools that assist in model execution, data analysis, and reporting. ·        Participating in the code review process and contributing to team discussions about software development best practices. Qualifications: ·        Actively enrolled in an accredited undergraduate program in Computer Science, Engineering, Mathematics, or a related field. ·        GPA of at least 3.0 on a 4.0 scale. Desired Skills: ·        Proficiency or familiarity with programming languages such as: ·        Python ·        C++ ·        C# ·        Experience with version control systems (e.g., Git). ·        Knowledge of software development methodologies (Agile, Scrum, etc.). ·        Strong problem-solving skills and an interest in developing software tools for real-world applications. ·        Familiarity with simulation or modeling software. ·        Ability to communicate technical concepts effectively to both technical and non-technical audiences. Clearance:  Ability to obtain/maintain a US government security clearance. Please note: US Citizenship is required for this position.
Key Skills
PythonC++C#GitAgileScrumProblem-SolvingSimulationModelingData AnalysisSoftware DevelopmentDebuggingPerformance ImprovementTechnical Communication
Categories
TechnologySoftwareEngineeringGovernment & Public Sector