sermah

_Largest Russian tech company. Worked on the video player SDK used across the company's apps, including Kinopoisk (video streaming service)._ - Built a network and data-loading analytics solution *from scratch*, including the specification and backend contract; *adopted in production by Kinopoisk* - Implemented a *Kotlin Multiplatform* bandwidth estimator, *reducing playback interruptions by 5–30%* and significantly improving estimation accuracy and stability - Migrated the SDK to *Kotlin Coroutines*, *cutting app startup time by 100 ms* - Added the option to skip audio preloading for muted videos, *reducing data usage by 5–10%* - *Sped up video start* by introducing player instance reuse - Developed and maintained the *short-video feed SDK* and the core video player library in a multi-module architecture - Maintained and extended a demo app, making short-video feed testing faster and more reliable - *Automated* versioning, builds and artifact publishing for all video player libraries - *Stack:* Kotlin, Coroutines, ExoPlayer, Kotlin Multiplatform, MockK, Robolectric

_Smart devices division building SaluteOS, an Android-based OS for TVs and smart speakers._ - Developed *system services and apps* for SaluteOS in a multi-module codebase - Built *services and APIs/SDKs* for remote control input, running-app tracking and detection of specific installed apps - Implemented *inter-process communication with AIDL*, including backward compatibility between service versions - Optimized JSON parsing of system app configs, *reducing processing time from 4 s to 200 ms* - *Investigated Android (AOSP) source code* to understand the behavior of system network settings - Wrote unit tests with MockK and *raised coverage of a 2,000+ line module from 40% to 80%+* - *Automated unit test coverage reporting* with Kover, giving every developer instant coverage insight - Wrote custom *Detekt* static analysis rules, including one that prevents oversized log messages - *Stack:* Kotlin, Dagger, Coroutines, AIDL, MockK, Robolectric, Kover, Detekt