> Markdown version of [/jobs/ext/3363603-senior-level-full-stack-software-engineer](https://www.wearedevelopers.com/jobs/ext/3363603-senior-level-full-stack-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Level Full-Stack Software Engineer - **Company:** I3, Llc - **Location:** Huntsville, AL, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** ASP.NET, JavaScript (Programming Language), Agile Methodology, C Sharp (Programming Language), Configuration Management, Linux, Human-Computer Interaction, Object-Oriented Software Development, Software Architecture, Software Tools, Next.js, Software Engineering, TypeScript, Virtualization Technology, Web Applications, Tailwind, ReactJS, Backend, Gitlab, Cloudformation, SC Clearance, Webpack, Infrastructure Automation Frameworks, Information Technology, Extreme Programming, Terraform, Docker - **Published:** September 17, 2026 - **Apply:** https://www.clearancejobs.com/jobs/9172880/senior-level-full-stack-software-engineer ## About the Role The Tactical Software and Autonomy Solutions (TSAS) team at i3 supports DoD customers in developing cutting-edge autonomy software architectures to distribute autonomous control across a diverse assortment of uncrewed air, ground, surface, and subsurface platforms. The team is seeking a senior level full-stack software engineer with 10+ years of experience to support a web-based virtual development and simulation environment. This is a new project leveraging a modern tech stack of ASP.NET Core, React, and TypeScript., * Must be a U.S. Citizen. * 10+ years of relevant experience. * Have a Bachelor of Science degree (or advanced degree) from an accredited college (ABET preferred) in computer science, engineering, mathematics, or the hard sciences. * Candidate must be a team player and be creative, adaptive, and excited to learn. * Candidate must be familiar with good configuration management practices and will be responsible for proper code maintenance, merging, and configuration management. * Active Secret Clearance or the ability to obtain and maintain an active Secret clearance or higher. * Position Location: In office in Huntsville, AL * CONUS Travel required: Less than 10% Preferred Experience/Skills: * Experience with C#, JavaScript, and TypeScript. * Experience with HTML and CSS styling. * Experience with web tools and frameworks such as ASP.NET, React, Tailwind, Vite, and NextJS. * Prefer understanding of agile software development, ideally Extreme Programming (XP). * Familiarity setting up and managing CI/CD infrastructure withing GitLab. * Experience with Linux is a plus. * Familiarity with Infrastructure-as-Code (IaC) tools such as Terraform or CloudFormation. * Experience with virtualization technologies like Docker and Kubernetes. * Experience developing software within government IL2/IL4 environments is preferred. * Any DoDD 8140/8570 certificates are beneficial. Knowledge/Skills: * Knowledge of office administration and procedures. * Exceptional judgment capabilities and relationship management skills. * Excellent communication, teamwork, and client service skills; ability to clearly communicate in discussions and written documents, and to deliver feedback clearly and tactfully. * Interact with a diverse array of customers and staff in a professional and courteous manner. * Work independently with accountability for accurate and complete results. * Be extremely organized and exceptionally detail oriented. * Work well both independently and in a team environment. * Be energized by a fast-paced work environment. * Must be able to communicate with others effectively. * Analyze information and respond appropriately. * Manage time wisely and prioritize tasks. * Provide superior customer service. * Multi-task in a pleasant manner. * Work well under pressure. Physical Demands: * The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. * While performing the duties of this job, the employee is regularly required to talk or hear. The employee frequently is required to stand; walk; handle or feel; and reach with hands and arms. * The employee is occasionally required to sit; climb or balance; and stoop, kneel, crouch or crawl. The employee must be able to lift and/or move up to 10 pounds and occasionally lift and/or move up to 25 pounds. * Specific vision abilities required by this job include close vision, distance vision, peripheral vision, depth perception and ability to adjust focus. * Regular i3 hours are 8:00 a.m. - 5:00 p.m. Monday-Friday, however, additional hours may be required on occasion. Regular and punctual attendance is required. ## Description * The candidate will work with or lead an Agile software development team delivering value to a DoD customer in small, incremental iterations. * The candidate will be responsible for developing both the user interface (UI) and backend of a large web application. * Candidate will develop software designs using best practices and object-oriented methodologies. * Candidate will develop automated unit and integration level tests. * Routine collaboration with team members in developing system capabilities is expected. * Other duties as assigned.