Денис

Middle Full-stack Developer
3+ years of commercial experience
Languages: Contact Information:
Ukrainian - Native Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
English – C1
GitHub: https://github.com/DenisFriz
Russian - Fluent
Telegram: @dEn1sSkf

Professional Summary:
Full-stack developer with 3+ years of commercial experience designing and building scalable
web and mobile applications. Skilled in architecting complex systems and designing full
application structures, including both frontend and backend services.
Strong background in modern JavaScript ecosystems, working with frameworks such as
React, Express.js, and Laravel. Experienced in containerizing and deploying multi-service
applications using Docker and Docker Compose.
Skilled in designing distributed architectures, orchestrating services, and optimizing
application performance using technologies such as Redis, RabbitMQ, and Nginx. Experienced in
implementing performance optimization techniques including lazy loading, CDN integration, and
server-side response compression.

Languages: Front-end frameworks: State management libraries:
• JavaScript (ES6) • React • Redux
• TypeScript • Next.js (app router) • RTK Query
• PHP • Vue.js (Composition API) • Zustand
• Python • Nuxt • Pinia
• TanStack Query
Styling / UI: Back-end frameworks:
• HTML Databases: Mobile:
• Express.js
• CSS • PostgreSQL • React Native
• NestJS
• SCSS / SASS • MongoDB • Expo
• Laravel
• Ant Design • MySQL
• FastAPI
• Bootstrap • SQLite
• Material UI
• Tailwind CSS Tools / Infrastructure: Testing library:
• PrimeVue • Redis • React testing library
• RabbitMQ • Vitest
Build automation tools: • Elasticsearch • Jest
• Gulp • Docker
• Webpack • Docker Compose
• Vite • Nginx Other technologies:
• Git (CI/CD, pull • GraphQL
request) • Socket.IO
Work experience
Company name: BrightByte
Role: Junior Front-end Developer
05.04.2023 – 30.08.2023 (5 months)
Technologies: React, Next.js, Zustand, Vitest, Jest, Socket.IO, Git, JavaScript, Material UI

1) Developed responsive user interfaces using React and Next.js;
2) Built reusable and maintainable UI components with Material UI;
3) Managed application state using Zustand for scalable state management;
4) Implemented real-time features such as live updates and notifications using Socket.IO;
5) Wrote unit and component tests using Vitest and Jest to ensure code reliability;
6) Developed clean and maintainable code using modern JavaScript (ES6+) features;
7) Collaborated with team members using Git for version control and code reviews;
8) Improved application performance by implementing lazy loading for images using the
Intersection Observer API and delegating expensive computations to Web Workers.

Company name: NextEdge
Role: Junior Back-end Developer
04.09.2023 – 29.02.2024 (6 months)
Technologies: Vue.js, Express.js, NestJS, Pinia, Docker, Nginx, Redis, MongoDB, PostgreSQL, Git

1) Developed RESTful APIs using Express.js and NestJS, and integrated them with Vue.js
frontend applications;
2) Built and maintained backend services following modular and scalable architecture principles;
3) Managed application state on the frontend using Pinia;
4) Designed and implemented database schemas using MongoDB and PostgreSQL;
5) Integrated caching mechanisms with Redis to improve application performance;
6) Containerized applications using Docker for consistent development and deployment
environments;
7) Configured Nginx as a reverse proxy and for serving applications;
8) Implemented version control workflows and collaborated with the team using Git;
9) Tested backend API endpoints using Postman.

Company name: Lavanda Group
Role: Middle Back-end Developer
10.03.2024 – 27.09.2024 (7 months)
Technologies: Laravel, FastAPI, Docker Compose, GraphQL, Socket.IO, MySQL, MongoDB, Nginx,
TanStack Query, Nuxt, React Native, Expo

1) Designed and developed scalable backend services using Laravel and FastAPI;
2) Built and maintained REST and GraphQL APIs for communication between frontend and
backend services;
3) Implemented real-time data exchange between client and server using Socket.IO;
4) Designed and optimized database schemas using MySQL and MongoDB;
5) Implemented efficient data fetching and caching strategies with TanStack Query on the client
side;
6) Containerized multi-service applications using Docker Compose to simplify development and
deployment;
7) Configured Nginx as a reverse proxy and for serving backend applications;
8) Integrated backend services with Nuxt frontend applications;
 9) Developed a cross-platform mobile application using React Native and Expo;
10) Optimized database queries by utilizing indexes, integrating Redis caching, and resolving the
N+1 query problem.

Company name: CodeNova
Role: Middle Full-stack Developer
07.10.2024 – 16.03.2026 (17 months)
Technologies: NestJS, Laravel, Redis, RabbitMQ, Elasticsearch, Docker, Nginx, Git, Next.js, Nuxt,
MySQL, PostgreSQL, MongoDB, Pinia, Redux

1) Developed modern user interfaces using Next.js and Nuxt frameworks;
2) Designed and implemented scalable RESTful APIs using NestJS and Laravel;
3) Optimized application performance by implementing Redis caching, reducing API response
times;
4) Configured Docker Compose for running and managing multi-service applications;
5) Worked with TypeORM and Mongoose to interact with PostgreSQL and MongoDB databases;
6) Implemented application state management using Pinia and Redux;
7) Set up a CI/CD pipeline on GitHub using Git for automated builds and deployments;
8) Implemented a high-performance search system using Elasticsearch.

Education
Kryvyi Rih National University
Bachelor of Information Technologies
2021 – 2025
Links:
Portfolio: https://denisfriz.github.io/Portfolio/
LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)
%D1%8F%D1%86%D0%B8%D0%BA-5789162a5/
LeetCode: https://leetcode.com/u/denisTd/
Codewars: https://www.codewars.com/users/DenisGod/stats