Unreal Engine Developer Jobs in St Louis, MO (NOW HIRING)

Build More Than Just a Career. Build Your Future. At Vailexa, we’re not just hiring — we’re building thinkers, creators, and future leaders. We believe in giving people the space to grow, the freedom to think, and the opportunity to create real impact from day one. If you’re someone who wants to learn fast, take ownership, and grow beyond limits, you’ll feel right at home here. Overview We are supporting a flight simulation and pilot training initiative focused on high-fidelity mission visualization and real-time simulation environments. This role is for a software engineer specializing in Unreal Engine (C++), not a designer or artist. The developer will be responsible for implementing core simulation logic, system integrations, and real-time application functionality to support training, sensor visualization, and mission scenarios. Key Responsibilities Unreal Engine Development (C++ Focus) Develop and implement application logic using Unreal Engine with C++ (not Blueprint-only) Load and manage DLC/plugins containing large 3D asset libraries (aircraft, naval systems, civilian models, etc.) Optimize and manage rendering of large-scale environments and dynamic assets Implement level-of-detail logic (e.g., converting MASS entities to full actors based on range/visibility) Simulation & Systems Integration Implement and integrate simulation protocols including: DIS (Distributed Interactive Simulation) CIGI (Common Image Generator Interface) OMS (Open Mission Systems) Use protocol inputs to drive: Actor positioning Animation triggers Real-time simulation behavior Support proof-of-concepts and production implementations for simulation interoperability User Interface & Data Visualization Develop UI components to support: Sensor data visualization Lat/Lon grid overlays on 3D globe environments User selections and highlighting Implement multiple camera modes (e.g., cinematic, tracking, cockpit perspectives) Build integrations to: Export simulation data to external data science platforms Consume input from external remote control/configuration systems Networking & Multiplayer Systems Implement Unreal Engine networking features: Multiplayer replication State synchronization across multiple simulation instances Support real-time, synchronized simulation environments (e.g., multi-cockpit scenarios) Simulation Features & Enhancements Contribute to development of advanced simulation capabilities including: Photogrammetry-based environments and 3D terrain (Cesium) Building and infrastructure data integration IR (infrared) sensor simulation and dynamic material responses SAR (synthetic aperture radar) simulation Weather systems and synchronized multi-environment conditions Time-of-day and control integrations (e.g., HOTAS via CIGI) Enhance realism and fidelity (lighting, shadows, materials, environmental effects) Required Qualifications Must be a U.S. citizen 3+ years of hands-on experience with Unreal Engine development using C++ Strong proficiency in C++ programming Experience building interactive, real-time 3D applications Understanding of: Game engine architecture Actor systems and scene management Performance optimization in real-time environments Ability to work as a software engineer (not a 3D artist or designer) Preferred / Differentiating Experience Experience with simulation standards: DIS, CIGI, OMS (or similar) Background in: Aerospace, defense, or simulation environments Real-time data integration or visualization Familiarity with: Unreal networking and multiplayer systems Sensor simulation or physics-based modeling Large-scale geospatial environments (Cesium, GIS, etc.) Ready to take the next step? If you’re excited about this role and ready to grow with a team that values ambition, ideas, and impact — we’d love to hear from you. Apply now and start building your journey with Vailexa.