Vadym

Full-stack Developer (Next.js + Node.js)

Vadym Denysiuk
Full-stack developer with 3+ years of commercial experience building production web apps with
React/Next.js and Node.js (NestJS/Fastify). I focus on clean architecture, performance, and
reliable integrations (payments, messaging, AI).

End-to-end delivery: UI → API → DB → integrations
Ownership of features: planning, decomposition, implementation, reviews, release
Mentoring a junior developer and running code reviews to keep quality consistent
OpenAI API integrations (chatbot / AI features) and Telegram bot development
Contacts
I would be happy to demonstrate my skills and knowledge at the interview.
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LinkedIn Selected Projects
GitHub
Kyiv, Ukraine (Remote) 1. DayDrive [ Next.js, TypeScript, MongoDB, Redux, Node.js/Fastify, LiqPay ]
Full-stack role. Automobile company website + backend services. Built and maintained UI,
delivered Fastify microservices, integrated payments (LiqPay), and implemented an AI
chatbot (“Drivy”).
Tech Skills
2. Telegram bot for car listings [ Telegraf, TypeScript, Node.js/Fastify, MongoDB ]
TypeScript / JavaScript Backend role. Bot for publishing cars for sale: admin management flow, validation, and
Node.js advanced filtering by parameters.
Fastify 3. Business Box [ Next.js, TypeScript, MongoDB, Redux, SendPulse, LiqPay ]
NestJS Full-stack role. Startup product: implemented UI features and backend integrations
React (messaging via SendPulse, payments via LiqPay).
Next.js 4. Artimat eCommerce [ Next.js, Redux, LiqPay ]
Redux Frontend role. Online store: product pages, cart/checkout UX, and payment integration.
Formik + Zod 5. Crypto Portfolio Tracker (pet project) [ NestJS, Next.js, PostgreSQL, Prisma, Redis, Docker,
REST API CI/CD ]
OpenAPI / Swagger Personal project to grow backend & DevOps skills: API + workers, queues, caching,
MongoDB containerization, and automated deployments.
PostgreSQL
Prisma
Redis / BullMQ Work Experience
Telegraf (Telegram bots)
Full-stack Developer / Sub-team Lead (2 engineers) Product company (NDA)
OpenAI API
January 2025 - Present | Remote
Docker (hands-on)
CI/CD Leading a 2-person sub-team (me + junior): task decomposition, code reviews, and delivery
Vercel support
AWS basics (learning) Developing and maintaining a production Next.js application: UI implementation, routing,
Kubernetes basics (learning) state management, and integrations
Jest (familiar) Integrating with a core backend owned by another team: API contract alignment, error
Webpack handling, and stable client-server interaction
Tailwind CSS Implementing authentication components: sessions/tokens, cookies, middleware, and
HTML5 related backend endpoints
CSS / SCSS / BEM Working with MongoDB for authentication and user-related data: schemas/collections, data
Linux validation, and consistency
Git
Figma Full-stack Developer GoodPage Studio
Scrum June 2022 - December 2024 | Ukraine / Remote
Jira
Built and supported full-stack applications (Next.js, Fastify/NestJS, MongoDB)
Integrated external services: payments (LiqPay), messaging providers, and other APIs
Improved UX and performance, refactored legacy code, fixed bugs, and maintained high
Soft Skills delivery quality
Wrote clean, structured code and collaborated closely with backend/frontend teammates
Teamwork
Mentoring Frontend Developer ITOP 1000
Responsibility January 2022 - March 2022 | Ukraine
Attention to detail
Analytical thinking Implemented UI components (forms, galleries, sliders) and page scripts
Refactored legacy code, fixed bugs, and improved usability
Collaborated actively with backend developers

Languages
Education
English — Intermediate Kyiv National University of Trade and Economics (KNUTE)
Ukrainian — Native
Master's degree, Digital Economics
September 2019 - December 2020 | Ukraine