Oleksandr – Rust, Dart, Swift

A large-scale decentralized platform designed to support community-led innovation through transparent funding and collaborative development of real-world solutions.

• Owned and developed a large-scale Rust workspace with multiple purpose-specific crates, including voting logic, event bus, node communication, and data serialization;
• Integrated libp2p for peer-to-peer networking between distributed governance nodes, managing peer discovery and message propagation during live voting rounds with significant staked ADA value;
• Designed an asynchronous event-driven architecture on the Tokio runtime, ensuring consistent behavior across distributed nodes under load;
• Architected the cross-platform crate exposure layer via FFI for native platforms (iOS, Android, desktop) and wasm-bindgen for web, a single Rust codebase serving all client targets without logic duplication;
• Built and maintained a comprehensive observability stack, including OpenTelemetry instrumentation across Rust services, a metrics pipeline into Prometheus, and dashboards in Grafana;
• Maintained zero Sev-1 incidents across all production governance rounds over more than four years of live operation;
• Built and owned the CI/CD pipeline using Earthly - reproducible containerised builds across the Rust, Dart, JS/TS projects, enabling consistent release artefacts regardless of developer environment;
• Sustained a weekly deployment cadence throughout the project lifecycle, supported by the observability stack and automated release pipeline.

Developed a Rust-based P&L and fee engine, delivered as a shared library across iOS, Android, and WebAssembly, using UniFFI and wasm-bindgen for cross-platform integration.

• Designed the library architecture to support iOS, Android, and WASM from a unified Rust codebase, eliminating platform-specific business logic forks;
• Implemented FFI using UniFFI for native platforms, enabling automatic Swift and Kotlin binding generation without handwritten glue code;
• Utilized wasm-bindgen for web targets, allowing the same financial logic to run client-side in React and Next.js without reimplementation;
• Eliminated a class of bugs previously caused by duplicating calculation logic across platforms.

AI-powered productivity platform used by professionals at leading tech companies, including Google, NVIDIA, and GitHub.

• Developed a cross-platform audio recording and playback module in Rust, ensuring consistent performance across iOS, Android, Web, macOS, Windows, and Linux from a unified core implementation;
• Implemented automated, safe binding generation from the Rust audio core to platform-native languages (Swift, Kotlin, JavaScript), removing the need for handwritten FFI code across all platforms;
• Developed a dedicated Rust integration layer to access platform-specific OS features through system calls, encapsulating unsafe operations within safe Rust abstractions;
• Integrated the Rust audio module with the Flutter client using FFI for native platforms and wasm-bindgen for web deployment.

Multi-brand streaming entertainment platform deployed across mobile, web, smart TV, and embedded set-top boxes for millions of users across Europe.

• Led system architecture for a multimedia platform supporting iOS, Android, web, smart TV, and embedded devices across multiple operating systems, including Linux, Tizen, WebOS, and FireTV;
• Developed A/V streaming components in Rust for embedded hardware, meeting strict latency and memory requirements in resource-limited environments;
• Led data modeling and schema design to ensure scalability for increasing concurrent user loads;
• Established engineering standards for version control, testing, deployment, and documentation across the platform;
• Delivered full-stack features using Rust, Dart/Flutter, Swift, and TypeScript;
• Conducted architecture and design reviews, serving as the technical reference for the team;
• Contributed to the Apple TV Flutter port, targeting a platform not officially supported by Google at the time.