New

Software Engineer Intern

Modern Technology Solutions, Inc.
401(k)
United States, Missouri, St. Louis
Jan 12, 2026
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. Interesting Work:* Our co-workers support some of the most important and critical programs to our national defense and security. Values: Our first core value is that employees come first. We challenge our co-workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry. 100% Employee Owned: We have a stake in each other's success, and the success of our customers. It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year. Great Benefits - Most Full-Time Staff Are Eligible for: Starting PTO accrual of 20 days PTO/year + 10 holidays/year Flexible schedules 6% 401k match with immediate vesting up to $9k annually Semi-annual bonus eligibility (July and December) Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account Up to $10,000 in annual educational reimbursement Other company funded benefits, like life and disability insurance Optional zero deductible Blue Cross/Blue Shield health insurance plan Track Record of Success: We have grown every year since our founding in 1993. Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and solutions company that provides high-demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity and Mission Assurance MTSI delivers capabilities to solve problems of global importance. 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 MTSI embraces nine core values including our first core value of Employees come first. Consistent with our Core Values, we are committed to Equal Opportunity, making decisions without regard to race, color, religion, sex, national origin, age, military/veteran status, disability, or any other characteristics protected by applicable law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities.