• Design, implement, and maintain software modules for production cost planning, including generation, storage, and transmission operating decisions • Support multi-region and inter-regional planning with long-term temporal and spatial resolution • Implement and improve large-scale optimization models, develop approaches for scenario analysis, sensitivity analysis, and long-horizon uncertainty • Build maintainable, well-tested, and well-documented code for production-grade planning tools • Design modular architectures that allow new technologies, policies, and constraints to be added over time • Improve runtime performance and memory efficiency for large datasets and long planning horizons • Integrate capacity expansion results with downstream models, Ensure data traceability and reproducibility of planning results • Collaborate with domain experts to validate model behavior and assumptions • Clearly communicate technical concepts and modeling results to both technical and non-technical stakeholders • Contribute to documentation and user-facing explanations of model logic and limitations