Łukasz Kubok — Product Engineer & System Architect

Bielsko-Biała, PL / Remote · High-frequency biometric companion app

• ▸Architected offline-first React Native telemetry companion client streaming 60fps real-time ECG/HRV sensors via custom C++ JSI host objects and WatermelonDB/SQLite.
• ▸Reduced p99 frame latency from 42ms to 14.2ms with zero thread-bridge drops; maintained 99.98% crash-free session rate across 450k+ active biometric monitoring devices.
• ▸Mentored a cross-functional squad of 6 engineers; established automated end-to-end regression suites with Maestro and deterministic profiling pipelines.

Warsaw, PL / Remote · Cloud telemetry and observability console

• ▸Led web console rewrite to Next.js and Tailwind, boosting Core Web Vitals to 98+ and slashing initial bundle payload by 54%.
• ▸Implemented real-time telemetry stream ingestion rendering 40,000 events/sec using canvas-based virtualization and WebSocket buffer multiplexing.
• ▸Authored company-wide headless design system library adopted across 4 internal engineering teams and public customer dashboards.

London, UK / Remote · Crypto-fiat POS terminal & institutional custody

• ▸Delivered high-assurance point-of-sale terminal client executing offline NFC EMV card emulation on hardened Android hardware.
• ▸Integrated hardware-backed MPC cryptographic key verification with Android Keystore and iOS Secure Enclave.
• ▸Automated end-to-end CI/CD fastlane pipelines, reducing enterprise store release verification cycles from 4 hours to 18 minutes.

Kraków, PL · Web applications & microservice integrations

• ▸Developed modular React single-page interfaces and RESTful Node.js APIs for enterprise logistics and B2B clients.
• ▸Introduced containerized local Docker environments and Redis caching tiers, decreasing peak server response times by 40%.