During February 2026, Dr. Sharp focused on backend development for the rails/rails repository, addressing a nuanced bug in JSON encoding for custom object keys within hashes. By ensuring the original key’s string representation was used during encoding, rather than the as_json result, Dr. Sharp resolved an issue that previously led to malformed JSON output and compatibility concerns. This fix required a deep understanding of Ruby, Rails internals, and JSON serialization. Through careful debugging and precise version control practices, Dr. Sharp improved API reliability and output correctness, demonstrating technical proficiency and attention to detail in maintaining robust backend systems.