Danylo Karpenko

Worked as a Full-Stack Engineer developing a real-time multiplayer poker game delivered as a Telegram WebApp. Designed and implemented the application architecture end-to-end, building both the React + TypeScript frontend and backend services using Node.js, Fastify, PostgreSQL, and WebSockets to support real-time gameplay and state synchronization. Integrated blockchain payments using TON Connect and USDT, implementing secure balance management and transaction validation. Optimized application performance

Worked as a Full-Stack Developer contributing to multiple product development projects, including a custom CRM platform and a digital creator NFT marketplace. Designed and developed scalable backend services using Node.js frameworks (NestJS, Express) and PostgreSQL, implementing business logic, API integrations, and data pipelines for complex workflows. Built and maintained full-stack features across React/Next.js frontends and backend APIs. Architected a CRM and affiliate aggregation platform integrating

Worked as a Full-Stack JavaScript Developer contributing to multiple web products across healthcare, e-commerce, and mobile domains. Developed and maintained production web applications using React and Node.js, building both frontend interfaces and backend APIs. Contributed to a large healthcare staffing platform used by medical professionals across the United States, implementing new features, improving system performance, and optimizing database queries. Also worked on additional projects including an e

Successfully finished a 3-month internship as a full stack JS developer. Gained experience of working with client and server parts of the project on a modern stack - the latest versions of Javascript, React, Node.JS. The internship included 1 month of studying core technologies and 2 months of developing the application in team with 8 devs, 2 QAs and 2 experienced mentors.

https://hexlet.io/u/danylokarpenko