Оксана

Oksana Pokhvalenko
C O N TA C T
☎ [відкрити контакти](див. вище в блоці «контактна інформація») F U L L - S TA C K D E V E L O P E R
oksanapokhvalenko
✉ @gmail.com
🌐 GitHub Full-stack TypeScript developer specializing in React 19 (frontend) and NestJS/Fastify (backend). Delivered
a rental platform end-to-end: React UI + NestJS API + Stripe payments + PostgreSQL, and an AdTech
🔗 LinkedIn platform with Prebid.js header bidding and ClickHouse analytics. Commercial experience building RBAC
✈ Telegram interfaces, REST API integrations, i18n, and responsive UIs for NDA clients. Strong focus on code quality
(TypeScript strict, zero any), testing (Vitest, Jest, Playwright), CI/CD, Docker, and AI-assisted development.
📍 Kyiv, Ukraine
Open to remote
EXPERIENCE
SKILLS
Frontend / React Developer Jan 2024 – Present
Languages Freelance (NDA clients)
TypeScript, JavaScript ◆ Building SPAs and multi-page sites with React 19, Gatsby 5, TypeScript (strict), Tailwind CSS, Radix UI
(ES2015+), SQL ◆ Feature development: RBAC-based interfaces, forms (React Hook Form + Zod/Yup), i18n, REST API integration
Frontend (TanStack Query, Axios)
React 19, Next.js, Vue 3, Angular, ◆ Testing & quality: Vitest unit tests, Playwright E2E, ESLint/Biome, Husky pre-commit hooks, CI/CD (GitHub Actions)
HTML5, CSS3, Sass/SCSS, ◆ Jira/Trello workflow, Figma-to-code implementation, code reviews, responsive design, refresh token auth flows
Tailwind, Radix UI, Headless UI, React 19, Gatsby 5, TypeScript, Tailwind, Radix UI, Flowbite, TanStack Query, React Hook Form, Zod, Vitest, Playwright, Jira
Recharts Fullstack Developer · Internship Sep – Oct 2025
State & Forms Bidmatic
Redux Toolkit, Zustand, TanStack ◆ Built AdTell end-to-end: news platform (RSS aggregation + Cheerio article parsing) with programmatic ad serving
Query, React Hook Form, Zod ◆ Frontend: Prebid.js with custom bid adapter (wrote adapter + tests + docs), Vite virtual modules for ad system,
Backend auction debug page with real-time event logs, analytics dashboard (Recharts) with saved views and CSV export
◆ Backend: Fastify v5 + Prisma + MongoDB, bid filtering pipeline (status → size → floor CPM → geo → frequency cap),
Node.js, NestJS, Fastify,
Express, Prisma, REST, Shadow DOM ad creation form, ClickHouse event ingestion with batch caching, cron-based RSS sync
◆ Observability: OpenTelemetry (traces/metrics/logs + MongoDB/Pino instrumentation), Sentry (error tracking +
Swagger/OpenAPI, Pino
session replay), Prometheus metrics endpoint
Databases ◆ Security: JWT (HttpOnly cookies), Argon2, rate limiting, CSP/HSTS; Docker Compose, Swagger docs; deployed on
PostgreSQL, MongoDB/Atlas, Vercel + Render
ClickHouse (OLAP) React 19, TypeScript, Tailwind CSS, Zustand, TanStack Query, Fastify v5, Prisma, MongoDB, ClickHouse, Prebid.js, OpenTelemetry, Sentry,
Payments & Maps Docker
Stripe Checkout + Webhooks,
Leaflet/OpenStreetMap PORTFOLIO
Auth & Security Heartland Homes — Short-term Rental Platform Team Project · My FE + BE
JWT, RBAC, Argon2, DOMPurify React 19 · TypeScript (strict) · Redux Toolkit · NestJS 11 · Prisma v7 · PostgreSQL · Stripe · Leaflet · i18n · SCSS · 188 tests
Testing ◆ Frontend: search + filters + interactive map, booking with price calc, Stripe Checkout, dark/light theme, i18n (EN/UA)
Vitest, Jest, Playwright, Testing ◆ Backend (NestJS): 26 REST endpoints, JWT + RBAC, Stripe webhooks, rate limiting, Prisma v7 + PostgreSQL
Library ◆ TypeScript strict mode (zero any), Biome + Stylelint, Husky pre-commit/pre-push; 137 FE tests (Vitest) + 51 BE tests
DevOps & Tools (Jest: unit, integration, E2E)
◆ Admin panel: full CRUD for accommodations, bookings, payments, users with role-based access
Git, GitHub Actions, Husky,
◆ Deploy: Vercel (FE) + Render (NestJS BE + PostgreSQL); CI/CD via GitHub Actions (typecheck + lint + build)
Docker, Vite, Vercel, Render, Jira,
Live Demo GitHub
Trello
Test: [відкрити контакти](див. вище в блоці «контактна інформація») / password123 · Stripe: 4242 4242 4242 4242
AI-Assisted Dev
Claude Code, GitHub Copilot,
AdTell — News + AdTech Platform Internship
React 19 · Tailwind CSS · Zustand · TanStack Query · Fastify v5 · Prisma · MongoDB Atlas · ClickHouse · Prebid.js · OpenTelemetry · Sentry
prompt engineering, code review · Docker · Vercel · Render
with AI
◆ FE: custom Prebid bid adapter (+ tests + docs), Vite virtual modules, auction debug page, analytics dashboard
AdTech (Recharts, saved views, CSV export)
Prebid.js, Google Ad Manager ◆ BE: Fastify v5 + Prisma + MongoDB, 21 endpoints, bid filtering pipeline (status → size → CPM → geo → frequency
(GPT), custom bid adapters, cap), Shadow DOM ad form, ClickHouse batch ingestion, RSS cron sync
ClickHouse analytics, Shadow ◆ Observability: OpenTelemetry (traces/metrics/logs) + Prometheus + Sentry; Security: JWT (HttpOnly), Argon2, rate
DOM limiting, CSP/HSTS (11 headers)
◆ 60+ tests (Vitest + Node), Biome linting, Husky pre-commit hooks, Docker Compose (5 services), Swagger API docs
i18n
◆ Deploy: Vercel (FE) + Render (BE) + MongoDB Atlas + ClickHouse; CI/CD via GitHub Actions (lint + build)
i18next (multi-namespace, date-
Live Demo GitHub FE GitHub BE
fns locales)
Test: [відкрити контакти](див. вище в блоці «контактна інформація») / pass6834
LANGUAGES
English Intermediate
Czech Intermediate
Ukrainian Native

E D U C AT I O N
Mate Academy
Frontend Development
Kherson Agrarian Univ.
Master's in Zoo Engineering