Developed a performance-optimized Dijkstra shortest path algorithm for the Hardvan/Java repository, focusing on improving pathfinding efficiency and scalability for large graphs. The implementation replaced the naive approach with a TreeSet-based priority queue, leveraging advanced data structures and algorithm optimization techniques in Java. Comprehensive unit tests were written to validate correctness across a variety of graph scenarios, ensuring reliability and maintainability. All work during the period was feature-driven, with no major bugs addressed, and included thorough documentation updates. The project demonstrated strong skills in graph algorithms, Java development, and unit testing, resulting in measurable improvements to core algorithm performance.