HackerRank's open-sourced ATS (Applicant Tracking System) has been tested and found to have inconsistent scoring due to its reliance on Large Language Models (LLMs). The system's grading rubric has been criticized for prioritizing open source contributions and personal projects over work experience. The author's resume scored differently each time it was run through the system, highlighting the non-determinism of the LLMs. This inconsistency raises concerns about the effectiveness of AI-powered hiring tools.