Dmytro

DMYTRO KOLISNYK
Full Stack Developer
Email: [відкрити контакти](див. вище в блоці «контактна інформація») | LinkedIn | GitHub | Telegram: @deepsomnias

PROFESSIONAL SUMMARY
Full Stack Developer with 4+ years of commercial experience across React/Next.js frontends and Node.js/NestJS backends. Worked across 3
companies and 7 commercial products/projects: SaaS and web products, internal tools, landing pages, marketing websites, ecommerce flows,
AI/reporting workflows, and video management systems. Main stack: JavaScript, TypeScript, React, Node.js, NestJS, Next.js, REST APIs,
PostgreSQL, MongoDB, Redis, Docker, AWS, and Cloudflare.
TECHNICAL SKILLS
Languages: JavaScript, TypeScript, Go
Frontend: React, Next.js, HTML5, CSS, SCSS, Tailwind CSS, Bootstrap, Responsive Web Design, jQuery
Backend & APIs: Node.js, NestJS, Go, REST APIs, API Development, Microservices, WebSocket, OAuth, JWT, Stripe Connect
Databases: PostgreSQL, MongoDB, MySQL, MariaDB, NoSQL, Redis, Database Design
Cloud/DevOps: AWS, Amazon S3, Amazon RDS, Amazon ECS, Cloudflare, Docker, Git, GitHub, CI/CD
Streaming & AI: RTSP, Video Streaming, Computer Vision, YOLO, SDK Integration, Apache Kafka, Kafka Streams
IMPACT
●Contributed to 7 commercial products/projects across 3 companies, from marketing websites and internal tools to ecommerce and video
systems.
●Built and maintained 25+ UI pages/components and shipped 20+ backend/API features in production codebases.
●Reduced AI Revenue Agent report generation to 20-30 seconds by using batching and parallel processing over large Stripe transaction
datasets covering up to 12 months.
●Worked in teams from 3-4 engineers to around 20 people across remote product and delivery environments.
●Integrated AWS, Cloudflare, Stripe API/Connect, Canada Post API, Mailchimp, OAuth/JWT authentication, Redis, and external REST APIs.
PROJECTS
AI Revenue Agent
●Built a Stripe OAuth reporting flow where users connected Stripe accounts and the system processed raw transaction data for financial
reports.
●Implemented batching and parallel processing for large datasets; report generation reached 20-30 seconds for up to 1 year of transactions.
●Worked on backend aggregation logic, API integration, authentication flows, and performance testing around report generation.
Video Management System
●Integrated SDKs, AI-related features, RTSP/video streaming functionality, and multi-camera activity processing.
●Worked on YOLO-based behavior pattern detection using public and custom-collected datasets.
●Handled tracking across multiple camera feeds simultaneously while keeping camera/feed context separated.
PROFESSIONAL EXPERIENCE
Best U Team | Full Stack Developer | July 2025 - June 2026 | Remote
●Delivered full-cycle features across SaaS platforms, internal tools, marketing websites, and video products - from frontend UI to backend
APIs and deployment.
●Built React/Next.js interfaces with reusable components, responsive layouts, multi-step form flows, and REST API integrations.
●Developed and maintained backend services using Node.js/NestJS, handling REST API design, production troubleshooting, and
performance-sensitive flows.
●Worked on video streaming and AI-related features, including SDK integrations and real-time backend processing.
●Managed Dockerized development workflows and participated in CI/CD release processes across multiple project cycles.
Sweet Stack Digital | Full Stack Developer | Oct 2024 - Jun 2025 | Remote
●Developed a full-stack delivery service platform using Next.js and NestJS, covering end-to-end product flow from configuration to order
placement.
●Built interactive React components for real-time order configuration: dynamic parameter selection, pricing updates, and multi-step user
flows.
●Integrated REST APIs for automatic price recalculation based on selected product options and configuration combinations.
●Implemented third-party service integrations including payment processing flows, and delivered responsive UI features and
production-level client fixes.
Beetroot AB | Full Stack Developer | Apr 2022 - Sep 2024 | Ukraine
●Delivered production websites across multiple industries: landing pages, marketing websites, corporate portals, and content projects.
●Customized CMS based websites and plugins using PHP, JavaScript, TypeScript, React, Twig, Tailwind CSS, and REST API integrations.
●Built responsive layouts, reusable components, SEO-oriented pages, and marketing-site functionality for client-managed websites.
●Integrated marketing tools, forms, third-party APIs, and analytics-related workflows to support business operations.
●Worked with designers and stakeholders on scope, implementation details, deadlines, and production website maintenance.
EDUCATION
State University of Intellectual Technologies and Communications | Bachelor Degree | Aug 2015 - Jun 2019
Background in radio and telecommunication systems; Arduino-based robotics design, assembly, and programming projects.