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Ruben Pieters

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Understanding the Kotlin to Dalvik bytecode translationdroidcon London 20252025-10-30
Walks through a Dalvik recompiler project that uncovers concrete translation bugs and debugging steps: builds go from Kotlin/Java → class files → D8 → DEX →…
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Understanding the Kotlin to Dalvik bytecode translationdroidcon Berlin 20252025-09-24
Kotlin/Java compiles to class files, D8 produces .dex, and ART may interpret, JIT or AOT compile — and concrete surprises happen: an overloaded method invoked…
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App Security from Necessary Evil to Performance Advantagedroidcon Berlin 20252025-09-24
Explains a concrete three-step flow: R8 minify for shrinking and basic name obfuscation, running baseline profiles to get about a 30% startup improvement via…
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Impact of Framework Choice on your Application: A Reverse Engineering PerspectiveAndroid Worldwide July 20232023-07-25
Builds a toy "coffee→apps" APK in plain Android, Jetpack Compose, React Native (Hermes), and Flutter, then actually modifies each build to make the counter…
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Impact of framework choice on your application: A reverse engineering perspectivedroidcon Berlin 20232023-07-05
Reverse engineering compares frameworks by doing real edits: decompiled Kotlin APKs with JEX and uses Frida hooking to change the increment method so a button…
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