During October 2025, Sheepmaster developed a feature for the ktorio/ktor repository focused on improving HTTP cache reliability. They addressed the challenge of case-insensitive varyKeys by implementing logic in Kotlin to lowercase varyKeys during deserialization, ensuring consistent cache behavior regardless of header casing. This approach preserved backward compatibility with existing cache data and included comprehensive tests to validate both uppercase and lowercase scenarios. Sheepmaster’s work demonstrated a strong grasp of backend development and testing practices, providing end-to-end traceability by linking changes to a specific commit and issue. The solution enhanced cache consistency while maintaining compatibility and robust test coverage.