Денис

Strong Middle Full-Stack
Developer (React / Node.js)
4+ years of commercial experience
Contact information:
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
GitHub: https://github.com/DenisFriz
Telegram: @dEn1sSkf

LANGUAGES
Ukrainian - Native
English - C1
Russian - Fluent
PROFESSIONAL SUMMARY
Programming languages: JavaScript, TypeScript, C#
Frontend: React, Next.js, Vue.js, Nuxt
Backend: Express.js, NestJS, Hono
State management libraries: Redux, Zustand, TanStack Query, Pinia, RTK Query
Databases: MongoDB, PostgreSQL, Supabase, IndexedDB
DevOps: Docker, Redis, RabbitMQ, Nginx, Prometheus, Grafana
ORMs: Prisma, Sequelize, TypeORM, Mongoose
Web technologies: RESTful APIs, GraphQL, WebSockets, WebRTC
Version control: Git, GitHub, GitLab CI/CD
Testing tools: Vitest, Jest, Supertest, Postman
Cloud: AWS (S3, EC2, CloudFront)

WORK EXPERIENCE
Company name: BrightByte
Role: Junior Full-Stack Developer
07.03.2022 – 02.03.2023 (12 months)
Technologies: React, Zustand, Axios, Express.js, MongoDB, TypeScript, WebSockets, Git CI/CD
Built interactive analytics dashboards with charts, tables, and KPI metrics using React and
TypeScript
Introduced an internationalization system (i18n) enabling multi-language support across the
platform
Developed a secure authentication system with email-based registration, login, password
recovery (Resend), and OAuth (Google, GitHub)
Enabled real-time communication in an online messenger using WebSockets for instant
message delivery
Contributed to unit/integration testing and improved UI stability through bug fixes

Company name: NextEdge
Role: Junior Full-Stack Developer
29.03.2023 – 02.05.2024 (14 months)
Technologies: React, Supabase, AWS, TypeScript, GitLab, TanStack Query, Redis, Docker, Hono
Leveraged AWS S3 to efficiently store and serve user-uploaded media
Added Redis caching layer to reduce database load and improve response times for
frequently accessed data
Built an AI-assisted feature for collecting user data and generating personalized
recommendations

Developed a Telegram mini-app (prize draw) using NestJS and Telegraf, implementing
random selection mechanics
Added two-factor authentication (2FA) to improve account security and protect user access

Company name: Lavanda Group
Role: Middle Full-stack Developer
16.05.2024 – 01.01.2025 (8 months)
Technologies: Next.js, Nuxt, TypeScript, Pinia, RTK Query, MongoDB, Nginx, Docker, GitLab,
NestJS, Express.js
Engineered a microservices-based e-commerce system using Express.js and Docker
Compose for automated deployment workflows
Designed complex database queries and data models using Prisma ORM for a trailer rental
marketplace
Configured Nginx as a reverse proxy for routing, load balancing, and production traffic
management
Delivered applications to production across Vercel and Render with stable
staging/production environments
Established CI/CD delivery pipelines and optimized global content distribution using
Cloudflare

Company name: CodeNova
Role: Middle Full-stack Developer
29.01.2025 – 16.10.2025 (9 months)
Technologies: React, Vue.js, Express.js, MongoDB, PostgreSQL, RabbitMQ, GraphQL, AWS,
Redis, GitLab
Migrated legacy no-code workflows (Base44) into a fully custom full-stack architecture
Connected ChatGPT API to the frontend to enable conversational user support
Orchestrated background processing using RabbitMQ for distributed service communication
Designed RBAC (role-based access control) system for multi-level permission management
Built offline-first functionality using IndexedDB for uninterrupted user experience
Developed an admin analytics dashboard tracking sales, traffic, and engagement metrics

Company name: VertexSoft
Role: Middle Full-stack Developer
06.11.2025 – 08.06.2026 (7 months)
Technologies: React, Vue.js, Express.js, MongoDB, PostgreSQL, RabbitMQ, Prometheus, Grafana,
AWS, Redis, GitLab
Delivered an LLM-powered recommendation engine for personalized product suggestions
Built a monitoring stack with Grafana for system health tracking and observability
Optimized backend performance using BullMQ for queue-based workload distribution
Implemented real-time audio and video communication using WebRTC
Designed and built the end-to-end application architecture according to client requirements

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»)
LeetCode: https://leetcode.com/u/denisTd/
Codewars: https://www.codewars.com/users/DenisGod/stats