olenadomchevska

Saga: Original History, an iOS app that narrates history as short audio stories. - Built and shipped the Expo/React Native app solo, from architecture to App Store release. - Integrated RevenueCat subscriptions with a paywall driven by live App Store pricing. - Designed an anonymous-first identity model with Supabase (Postgres, RLS) and Sign in with Apple. - Built a Contentful content pipeline localized in English, Spanish and Portuguese; persistent audio player with lock-screen controls; Maestro E2E tests.

Synth is a decentralized price-forecasting network on Bittensor (SN50). - Built Synth Terminal, a production LLM chat interface on the Anthropic Claude SDK: multi-turn tool use, SSE streaming, sandboxed code execution (E2B), file attachments (Files API), MCP server integration. - Cut LLM token costs by 30% with prompt caching and keyword-filtered retrieval; routed requests between Claude Haiku and Sonnet/Opus by complexity; built per-generation cost and token-usage telemetry in PostHog. - Built and shipped Synth Dashboard (dashboard.synthdata.co), a Next.js subscription analytics platform for crypto market data (volatility, options, LP analytics, liquidations, prediction markets) with ~1,000 monthly active users. - Designed an end-to-end Stripe billing pipeline synced to Supabase; built ECharts visualizations over Synth API, Deribit, Polymarket and Limitless feeds; integrated wagmi wallet connectivity.

Keabank is a global crypto-friendly neobank: SWIFT and SEPA payments, IBANs, crypto exchange and custody, FX. - Owned the KYC onboarding flow end to end and released it to production (~70% onboarding completion). - Built the client banking dashboard (dashboard.keabanking.com), the internal admin panel, and the React Native mobile app in parallel. - Shaped technical architecture and UX decisions; conducted technical interviews. Stack: React, Next.js, React Native, TypeScript, Tailwind CSS, Storybook, Jest, Turborepo, Vercel

Mode is an Ethereum Layer 2 built on the OP Stack for AI-native DeFi. - Built and shipped Mode Trade (trade.mode.network), a non-custodial perpetual-futures DEX in Next.js on Orderly Network's hybrid order book (100+ pairs, up to 50x leverage, USDC margin, on-chain settlement); $50M+ trading volume. - Built AI trading agents that execute strategies autonomously using Synth price forecasts (Vercel AI SDK, OpenAI, GOAT SDK, E2B). - Engineered multi-chain wallet auth unifying Privy, wagmi/viem, RainbowKit and Solana adapters across EVM and Solana. - Built portfolio, leaderboard, referral and affiliate dashboards (D3/Visx/ECharts); cross-chain bridging (Li.Fi) on Mode Dashboard; Contentful CMS and PostHog feature flags.

Odesa, Ukraine. - Articulate (Team Leader, 2020-2022): led a team of 4 engineers (Kanban) building a browser-based video and audio recording and editing platform on native Web APIs; ran performance reviews and worked directly with the client and their engineers. - CDX Credit Union Service (2020): built a car-loan simulator with complex calculations for vehicle price, term, monthly payment and trade-in; wrote unit tests. - Network Services Connect (2019-2020): developed the web admin panel, mobile app and Node.js backend of an enterprise single-sign-on app launcher; integrated Stripe and Apple Pay. Stack: React, Redux, Redux Saga, TypeScript, Vue.js, Vuex, Node.js, Stripe, Apple Pay, Jest, Storybook