Oksana V.

I build production dashboards and AI-powered SaaS - dashboards, healthcare, telegram mini apps, RAG memory systems, ai chatbots, multi-tenant apps - on a Next.js / React / TypeScript stack. Full-Stack Developer, 5+ years building scalable, secure web apps across AI, healthcare, web3, and IoT - from PostgreSQL schema and payments to streaming LLM features and pixel-perfect UI. Teams also bring me in to debug, harden, and fix vulnerabilities in live products. WHAT I DO BEST • Full-stack SaaS: multi-tenant dashboards, role-based access, admin panels, drag-and-drop UIs, PDF, payments and media handling • Cleanup, fix ai generated code • Payments & security: Stripe and other gateways (one-time + subscriptions), webhook-verified flows, security audits and vulnerability fixes • Web3: wallet connections, smart-contract interactions, NFT / quest platforms • AI / LLM: RAG and vector search, real-time audio agents, persistent memory, multi-provider orchestration (Claude, OpenAI), LangChain, Vercel AI SDK SELECTED PROJECTS • AI Coaching Platform - production AI SaaS with real-time audio agents, a RAG memory system (vector DB + Postgres) grounding every response in user history, multi-provider LLM streaming, and automated workflows. (Next.js, Express, Supabase, Vercel AI SDK, LangChain) • Healthcare Dashboard - role-based patient and doctor portals with task management (kanban, drag-and-drop), calendar, AI doctor tools, and PDF/DOCX handling. • NFT Quest Platform (web3) - wallet and smart-contract interactions; full flow from admin quest creation to the user experience; migrated Vue/Nuxt to Next.js. • Prize Competition Platform - secure card payments (webhook verification, settlement tracking), instant-win mechanics, and admin payouts; found and fixed a payment vulnerability in a security audit. • Analytics Dashboards - complex data builder with dynamic visualizations and secure profile management. • SaaS for Artists - auth, group collaboration, media handling (text and audio), audio players, and calendar. TECH STACK Frontend: React, Next.js (App Router, SSR), TypeScript, Tailwind, shadcn/ui, Framer Motion, Redux Toolkit, TanStack Query Backend: Node.js, Express, Nest.js, serverless (Firebase / Supabase functions), REST APIs, webhooks, cron jobs AI / LLM: Claude, OpenAI, Vercel AI SDK, LangChain, RAG, vector databases Data & Auth: PostgreSQL, Supabase, MongoDB, Firebase; NextAuth, Firebase Auth, JWT, OTP Payments: Stripe + other gateways (one-time + subscriptions) Tools: GitHub / GitLab, Figma, Vercel, Sentry HOW I WORK Clean, maintainable code. Honest timelines and clear communication. I care about what bites later - security, edge cases, and performance.