Beyond the resume.

Full-Stack Web3 Developer

On-chain fund administration platform enabling crypto fund managers to create, operate, and report on tokenized investment vehicles across EVM chains (Ethereum, Arbitrum, Base, BSC).

• Designed end-to-end transactional flows covering signature, approval, deposit, and withdrawal paths across onchain and offchain steps — validating input, signing and dispatching write-contract calls, parsing receipts, and reconciling state into PostgreSQL.
• Architected a multi-network, multi-wallet dApp routing each operation to the correct chain and wallet, handling EOA and smart-account paths with paymaster-sponsored gas via ERC-4337.
• Built a unified write-operation module handling network/wallet detection, smart-wallet compatibility checks, input validation, transaction lifecycle stages, and progress feedback.
• Read, analyzed, and contributed to Solidity protocol design decisions, ran local experiments to validate proposals, contributed to gas optimization passes, and implemented a function-level onchain authorization system controlled by wallet address with matching admin UI.
• Implemented subgraph indexing across multiple linked contracts and block ranges, cutting event query latency by up to 5x and unlocking near-real-time UI updates.
• Implemented NAV prediction and extrapolation using linear, compound, geometric, and regression models, with charting layers aggregating onchain event data and offchain database records.
• Drove production reliability and 3x page load improvements through targeted caching, Next.js SSR/ISR, and continuous refinement guided by Sentry, Alchemy, and Vercel log analysis.

Full-Stack Developer

Delivered full-stack solutions across multiple concurrent client projects in HR, loyalty, real estate, and mobile sectors — configurable backend engines, third-party wallet and payment integrations, admin dashboards, React Native mobile apps, and legacy framework migrations.

• Architected a configurable promotion and reward engine for a multi-tenant loyalty platform (ClientManager), evaluating multiple criteria per individual cardholder on a Koa 2 / MySQL API.
• Integrated Apple Wallet (PassKit) and Google Wallet for digital loyalty cards, Stripe for merchant billing, QR-code payment generation, and SMS/email campaign dispatch; built the React admin dashboard and the Expo mobile app with barcode-scan loyalty reader and OTP sign-in.
• Built a recruitment pipeline for an HR SaaS (HubTeam) with drag-and-drop status tracking, Google Calendar integration with auto-generated Meet links, and candidate CV generation via the Google Docs batch-update API.
• Migrated a Swiss real estate quotation platform (Adhoc) from Angular to React — refactored authentication and permissions, fixed price-formula bugs across property types, extended the PDFTron generation pipeline, and implemented a chatbot assistant.
• Built the main post feed with countdown timers and pause/resume tracking, settings, search, bookmarks, and animated components on a React Native / Expo events and promotions mobile app using NativeWind.

Junior Full-Stack Developer

Built features across 6 client projects spanning education, marketing, e-commerce, and health sectors.

• Developed interactive educational games with multiple difficulty levels, custom Vimeo media players, and Stripe payment integration for Bluemanor Academy.
• Implemented SSO/SAML authentication (Azure AD, OKTA) and SEO optimization with Google structured data for Lessontrek (cybersecurity education SaaS).
• Built live chat (WebSocket), vendor search mechanics with Mixpanel analytics, and graphical dashboards across Vendorstan and Protogetic.
• Upgraded Node.js v6 to v14 and refactored auth/authorization for role-based access on ALS-AID (medical mobile application).

Junior Full-Stack Developer

Built RESTful APIs with Node/Express and responsive UIs with React and EJS; implemented authentication with Passport and JWT; worked across PostgreSQL, MongoDB, and a GraphQL/Apollo e-commerce model.

Civil / Site Engineer — Technical Office

Five years of multi-site construction project administration — Mecca, Lviv, Comrat, Kyiv — managing teams of engineers, maintaining communication with clients, suppliers, and subcontractors, and developing spreadsheet/VBA progress-tracking systems. This is where I learned to plan under constraint, anticipate downstream problems, and communicate across disciplines. It still shapes how I approach software.