Denys

Denys Dudnyk
Frontend / Full-stack Developer
Nitra, Slovakia | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)

Portfolio: https://denys-dudnyk.vercel.app/ | GitHub: https://github.com/Denys-Dudnyk

About Me
Frontend/Full-stack developer with 3+ years of experience building web applications
using React, Next.js, and Node.js. Strong focus on performance optimization, responsive UI,
and scalable architecture.

Skills
Frontend: React, Next.js, Redux Toolkit, React Query, Effector, Tailwind, Material-UI
Backend: Node.js, Express.js, Nest.js, MongoDB
Other: Git, Nginx, Vercel, Heroku, Railway.app, OAuth, JWT

Work Experience
Frontend Developer | NomoCashback (StartUp) | Dec 2024 – Present | Remote

- Participated in building a cashback platform from scratch, enabling cashback in fiat (UAH)
and proprietary cryptocurrency for offline businesses (restaurants, shops, pharmacies,
cosmetics, etc.).
- Developed a user dashboard with real-time transaction tracking and personal QR codes for
in-store cashback.
- Built a partner dashboard with cashier functionality, sales analytics, inventory
management, and staff accounts.
- Contributed to integrations, client communication, and teamwork with developers.
Tech Stack: Next.js, Supabase, TypeScript, Tailwind

Frontend Developer (Freelance) | Dec 2023 – Present | Remote

- Building responsive and high-performance websites for clients.
- Designing and developing user interfaces with modern technologies.
- Ensuring cross-browser compatibility and performance optimization.
Tech Stack: React, Next.js, TypeScript, Nest.js, Tailwind
Full-stack Developer | Education in Slovakia | Aug 2023 – Dec 2023 | Remote

- Developed multilingual website increasing user engagement by 20%.
- Implemented internationalization and optimized site performance.
Tech Stack: React, Next.js, TypeScript, Nest.js, Tailwind, i18n

Full-stack Developer | Sigmanit | Mar 2023 – Aug 2023 | Remote

- Developed and maintained an e-commerce website for chemical components.
- Supported international cooperation with Romania and Italy.
Tech Stack: React, Next.js, Tailwind, Nest.js, Framer, Nodemailer

Full-stack Developer | HTMLLessons.io | Jul 2022 – Oct 2022 | Remote

- Built an online cinema application with search, detailed movie cards, recommendations,
favorites, and admin panel.
- Implemented authentication and user accounts for managing favorites and history.
Tech Stack: React, Next.js, MongoDB, Tailwind, Nest.js, TypeScript, Redux Toolkit, TanStack
Query

Education
High School | Poltava, Ukraine | 2008 – 2019

Courses
HTMLLessons.io | Jun 2022 – Jan 2023
Gained hands-on experience building front-end and back-end applications.

Languages
Ukrainian – C2
Russian – C2
English – B1 (Intermediate)
Slovak – B2