Slava Petrovets

- Owned the entire graphics layer end-to-end — a GPU-accelerated subsystem with custom GLSL shaders and a Qt/QML rendering pipeline. - Replaced the team lead's ill-fitting approach to on-device voice transcription: designed and built an offline speech-recognition feature with no external API calls, running fully local on mobile hardware. - Profiled the codebase, cut memory usage and cold-start time, and cleared long-standing rendering bottlenecks; main escalation point for the hardest Qt/C++ problems.

- Built a Telegram client for AuroraOS (embedded Linux) from scratch — solely responsible for Qt/QML UI, C++ core, networking, and architecture. - Implemented audio/video calling from zero with WebRTC and FFmpeg on a resource-constrained embedded device; wrote a custom text-rendering engine and a reusable licensing library. - Built two-way Exchange / Office 365 sync (iCalendar, vCard, email); owned secure sessions/HTTPS; ran code reviews and architecture calls.

- Part of an R&D team building a full office suite (word processor, spreadsheets, presentations) in Qt/QML for AuroraOS and KasperskyOS — platforms with almost no tooling or community support. - Wrote an RFC-compliant IMAP/SMTP email client from scratch, designed the database schema, and ported it to Android. - Built a system-level contacts/calendar sync service (WebDAV, REST, SOAP) — the main integration point with external platforms; kept UI to HIG and refactored undocumented legacy code.

- Developed and maintained a range of enterprise desktop applications in C++/Qt, including systems with no existing documentation. - Built web-based billing and VoIP management interfaces using HTML, jQuery, and PHP. - Migrated legacy applications to modern platforms and administered SQL databases.