FTS has an opportunity for a Visualization & Simulation Software Engineer (Geospatial/RF Systems) in Chantilly, VA. The Visualization & Simulation Software Engineer (Geospatial/RF Systems) will develop advanced 3D visualization and simulation tools for geospatial, satellite, and RF-based systems. **Responsibilities** - Design and develop real-time 3D visualization platforms using Three.js for: - Satellite orbits and trajectories - Antenna cones, beam patterns, and coverage volumes - Line-of-sight and obstruction modeling - Build full-stack systems connecting Python-based simulation engines to webbased visualization clients (WebSockets, APls, streaming pipelines) - Develop and optimize geometry and spatial algorithms, including: - Coordinate transforms (ECEF, ENU, azimuth/elevation) - Volume intersection - Visibility and occlusion detection - Handle large-scale, time-dependent datasets (interpolation, streaming, preloading strategies) - Optimize rendering performance for high object counts and real-time updates - Architect backend services for simulation, data ingestion, and preprocessing - Guide system design decisions and mentor junior engineers **Required Skills/Qualifications** - US Citizen - Ability to obtain a TS/SCI with polygraph - BS STEM (Science, Technology, Engineering, or Math) in engineering discipline - 5+ years of software development experience - Strong expertise in JavaScript/Typescript and Three.js (WebGL) - Strong proficiency in Python for simulation, numerical computation, or backend services - Deep understanding of 3D math and spatial reasoning, including: - Vector math, coordinate systems, transformations - Spherical geometry and geospatial calculations - Experience building real-time or near-real-time systems - Strong algorithm development and problem-solving skills, especially for geometry-heavy problems - Experience with full-stack development (REST APls, WebSockets, client-server architecture) **Desired Skills/Qualifications** - TS/SCI with polygraph - Experience with: - Satellite systems, orbital mechanics, or geospatial platforms - RF/antenna modeling or signal propagation - Scientific visualization or simulation systems - Familiarity with: - PyVista, VTK, or similar for backend 3D processing - GPU concepts (shaders, GLSL, WebGPU) - Experience with Dockerized deployments and production systems - Background in physics, aerospace, or related technical domains