Nikita Zalevskii

=== Atomic Wallet — React Native rebuild (May 2025 – Present) === Core developer in a 3-person team rebuilding the production mobile crypto wallet (Vue 3 + Cordova → React Native). Own client UI, key user flows, infrastructure integration, and performance engineering. Product work: — Built UI Kit from scratch with on-device Storybook, custom theming, consistent patterns for 85+ screens — Own key user flows: onboarding, send/receive, wallet creation and recovery with BIP32/BIP39 validation — Integrated push notifications (Firebase), deep linking, biometric auth (Keychain) Performance & native layer: — Cut first wallet load time ~2x vs the public Vue 3 + Cordova version — moved hot computations to native layer via JSI, replaced 4-layer data shim with a direct native driver. Login on modern devices: 2.5–3 seconds — Built production JSI (HostObject) module react-native-secp256k1 — native wrapper over libsecp256k1 and OpenSSL P-256 for BTC/ETH/P-256 signing. Elliptic operations reduced from ~55ms to ~0.1ms — Migrated data layer from legacy 4-layer shim (Dexie → indexeddbshim → react-native-sqlite-2 → SQLite) to direct JSI layer via op-sqlite — Moved heavy JS crypto calls (PBKDF2, HMAC, secp256k1) to native JSI and @noble/curves via custom Metro interceptors Also: long list virtualization, React.memo with custom comparators, Reanimated 3 for gestures, native-driver Animated in parallel with heavy JSI crypto (bypassing Hermes mutex contention). Stack: React Native, TypeScript, Redux Toolkit, MMKV, op-sqlite, Reanimated 3, Firebase, JSI (C++), Fabric, Hermes, Storybook === Atomic Wallet — Polymarket integration (Vue 3 + Cordova) === — Built Portfolio section: claim winnings, history sync, active bets, balance with 24h change — Built multi-step onboarding from scratch: navigation, form validation, app flow integration Stack: Vue 3, Cordova, JavaScript

Professional training program in frontend development. Completed 10+ projects, including: — SkyWell: React SPA for weather tracking (Redux Toolkit, TypeScript, React Router, Axios, SCSS, REST API). City search with autocomplete, theme switching, data caching. github.com/nikzalevskii/skywell — ItStorm: IT services site with blog platform on Angular (RxJs, TypeScript, Angular Material). Registration/auth, comments, likes, dynamic content management. github.com/nikzalevskii/bitstorm — GreenStore: SPA plant store on Angular. Product catalog, cart, wishlist, auth. github.com/nikzalevskii/im More projects at github.com/nikzalevskii Stack: React (Redux Toolkit, React Router), Angular (RxJs, Angular Material), TypeScript, JavaScript, HTML, CSS/SCSS, responsive design, REST API, ESLint, Postman, Git

Led project teams in CAE computational simulations (mechanical engineering, fluid dynamics). Managed scope, deadlines, and cross-functional delivery; communicated with clients and stakeholders. Delivered projects across energy, mechanical engineering, and road safety certification. This engineering and leadership foundation is why I'm comfortable going deep into native layers and performance work in my current React Native role.