Build and extend GNSS signal generation software using working prototypes as the foundation. Implement core modules for real-time GNSS simulation, including signal timing, PRN encoding, and data modulation. Refactor, optimize, and productionize prototype code for maintainability and performance. Integrate observation and navigation data (RINEX) into the simulation pipeline. Collaborate with signal processing and research teams to validate correctness of generated outputs. Use open-source GNSS tools and Linux-based development practices to deliver a reliable software-only solution. Ensure deterministic execution under real-time conditions in a modular, extensible architecture.