Reflection in Kotlin is a powerful mechanism to introspect the program behavior during its execution at run-time. However, among the variety of practical task involving reflection, there are scenarios for which poor performance of the runtime approach becomes a significant disadvantage. This problem manifests itself in Kotless, a popular framework for developing serverless applications, because the faster the applications launches, the cheaper their cloud infrastructure costs. %Nevertheless, the run-time reflection approach has been used in Kotless due to the lack of alternatives, that combine the concise way of their usage with the overall efficiency. In this paper, we present Reflekt — a compile-time reflection library to perform the search among classes, object expressions (which in Kotlin are implemented as singleton classes), and functions in the Kotlin source code based on the given search query. It comes with a convenient DSL and much better performance comparing to the existing run-time reflection approaches. Our experiments show that replacing run-time reflection calls to the Reflekt approach in the Kotless source code resulted in a significant performance boost in the start-up time of the applications.