Bruno Vieira developed advanced solver configuration and integration features for large-scale energy system optimization projects. In open-energy-transition/pypsa-eur, he enabled both default and GPU-accelerated Xpress solver modes, exposing barrier method settings to improve performance and scalability for linear programming tasks. His work emphasized configuration-driven design and reproducibility, using Python and YAML to streamline scenario analysis workflows. In cvxgrp/cvxpy-ipopt, Bruno updated the XPRESS solver interface for compatibility with Xpress 9.8 and introduced bounded variable support, enhancing modeling flexibility while maintaining API stability. His contributions demonstrated depth in solver development, optimization, and integration, addressing complex requirements with robust, maintainable solutions.