Cortance
Full Stack developer
Valerii V.
Available hours \ week
40 h/w
Seniority level
Senior
Years of experience
10 yrs.
Location
Poland
Timezone
(GMT+02:00) Athens
Languages
English
Fluent (C2)
About
I’m a software developer with 9 years of experience, focusing on full-stack development. I’ve worked with a variety of technologies and have developed many different kinds of projects across several industries, including fintech, healthcare, Real estate, B2B & B2C, CRM systems, AI, trading and blockchain technology. For backend development, I’m experienced with PHP(Laravel/Symfony), Node.js(Express.js , Nest.js), Python(Django/Flask), and Golang. I’ve handled everything from creating APIs to managing server-side logic. On the frontend side, I know my way around React, Vue.js, and Angular. I am skilled in developing user interfaces that align with design specifications and integrating frontend components with backend APIs When it comes to databases, I have extensive experience working with a variety of databases, including MySQL and PostgreSQL for relational data management, MongoDB for NoSQL solutions, Oracle for enterprise-level applications, and Redis for in-memory data storage
Core skills
  • JavaScript 10 yrs.
  • Node.js 9 yrs.
  • PHP 9 yrs.
  • React.js 9 yrs.
  • Laravel 8 yrs.
  • Blockchain 8 yrs.
  • Solidity 7 yrs.
Other skills
  • Python 7 yrs.
  • Java 6 yrs.
  • Vue.js 5 yrs.
  • AngularJS 4 yrs.
  • Golang 4 yrs.
  • Fast API 4 yrs.
Experience
Fund My Contract
Senior Software Engineer
About the Project

Developed several projects including stock trading platform integrated with Forex.

  • Fintech
  • Trade
Responsibilities

• Developed RESTful APIs and GraphQL endpoints and implemented WebSockets to facilitate real-time updates on stock prices, Forex rates, and user notifications • Integrated third party APIs like Alpha Vantage, IEX Cloud, Yahoo Finance API to fetch real-time and historical stock market data, Forex data, and cryptocurrency data. • Designed and deployed a microservices architecture using Docker and Kubernetes, • Employed PostgreSQL for relational data and MongoDB for handling semi-structured data,

Skills & technologies
  • React.js
  • Node.js
  • Laravel
Gempad
Senior Blockchain Engineer
About the Project

Blockchain IDO launchpad, token presale platform.

  • Blockchain
  • Fintech
  • Crowdfunding
Responsibilities

• Collaborated with frontend developers to integrate React.js for dynamic user interfaces and Web3.js for blockchain data interactions, ensuring a seamless user experience. • Developed smart contracts using Remix, Truffle, and Hardhat, implementing standards like OpenZeppelin (ERC-20, ERC-721). • Worked on EVM chains (Ethereum, BSC, Polygon, Avalanche) and Solana network. • Developed and maintained decentralized applications (dApps) on Ethereum using Python and web3.py

Skills & technologies
  • Blockchain
  • Solidity
  • React.js
  • Node.js
Whatsapp Chatbot
Fullstack developer
About the Project

The chatbot integrated with WhatsApp to assist users in purchasing products from e-commerce shops. The chatbot provided user experience by guiding customers through product selection, purchase, and post-purchase support directly within the WhatsApp interface.

  • AI Software
  • Chatbots
Responsibilities

- Implemented the backend using Node.js and Express to handle API requests and integrate with the e-commerce platform’s database. - Developed Python/Flask backend services, particularly for integrating OpenAI’s ChatGPT to provide advanced conversational capabilities and dynamic responses. - Integrated OpenAI’s ChatGPT through API to enable sophisticated natural language processing and interactive responses. - Utilized both SQL (MySQL) and NoSQL (MongoDB) databases to manage user data, product i

Skills & technologies
  • Node.js
  • React.js
  • Python
Education
Dnipro University of Technology
2009 - 2013
Computer Science