
Aleksandr Shefer developed and stabilized cross-language interoperability features for Kotlin’s WebAssembly (Wasm) backend, focusing on both the JetBrains/kotlin and google/kotlin repositories. He implemented Wasm-specific export safety mechanisms, such as JsExport name clash detection, and introduced the nativeInvoke annotation to enable direct native function calls from Kotlin/Wasm. His work involved refactoring annotation logic into reusable modules, optimizing code generation for primitive types, and expanding end-to-end test coverage to ensure reliable interop behavior. Using Kotlin, Java, and advanced compiler development skills, Aleksandr addressed artifact hygiene, improved error handling, and strengthened the maintainability and correctness of Wasm-targeted compiler infrastructure.

October 2025 monthly summary focused on advancing Kotlin's Wasm JS interop and stabilizing the nativeInvoke annotation lifecycle. Key refactor moved nativeInvoke to a reusable module, introduced a deprecation path while the stable design is developed, and expanded end-to-end test coverage to validate interop behavior (including the KT-79937 case). Test environment adjustments ensured compilation with opt-in usage suppression where needed, and CI/test suites were aligned for reliability.
October 2025 monthly summary focused on advancing Kotlin's Wasm JS interop and stabilizing the nativeInvoke annotation lifecycle. Key refactor moved nativeInvoke to a reusable module, introduced a deprecation path while the stable design is developed, and expanded end-to-end test coverage to validate interop behavior (including the KT-79937 case). Test environment adjustments ensured compilation with opt-in usage suppression where needed, and CI/test suites were aligned for reliability.
September 2025 performance summary: Delivered cross-target Wasm quality improvements and backend optimizations across JetBrains/kotlin and google/kotlin. Key features and refactors enhanced maintainability and correctness, while targeted tests improved Wasm interoperation reliability. The work reduces interop-related issues, streamlines Wasm code generation, and strengthens compiler infrastructure for Wasm targets.
September 2025 performance summary: Delivered cross-target Wasm quality improvements and backend optimizations across JetBrains/kotlin and google/kotlin. Key features and refactors enhanced maintainability and correctness, while targeted tests improved Wasm interoperation reliability. The work reduces interop-related issues, streamlines Wasm code generation, and strengthens compiler infrastructure for Wasm targets.
August 2025 monthly summary: Focused on stabilizing Kotlin/Wasm artifacts and expanding interop capabilities across Google Kotlin and JetBrains Kotlin repos. Delivered Wasm-specific export safety and improved artifact hygiene, enabling safer cross-language interop and cleaner build outputs.
August 2025 monthly summary: Focused on stabilizing Kotlin/Wasm artifacts and expanding interop capabilities across Google Kotlin and JetBrains Kotlin repos. Delivered Wasm-specific export safety and improved artifact hygiene, enabling safer cross-language interop and cleaner build outputs.
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