During March 2025, Kondav contributed to the Hardvan/Java repository by developing a linear system solver for equations of the form Ax = b. The solution employed Gaussian elimination with partial pivoting to ensure numerical stability, followed by a back substitution phase. Kondav implemented input validation to detect singular matrices, raising an IllegalArgumentException when necessary. Comprehensive unit tests were integrated to verify solver correctness across a range of matrix scenarios. This work, written in Java and leveraging skills in algorithm implementation and numerical methods, enhanced the repository’s core linear algebra utilities and improved its reliability for mathematical and engineering applications.