Oleksandr O Full-stack Developer
Summary
- 10+ years experience as a Full-Stack Developer with of developing robust web applications and services, including extensive experience in both frontend and backend technologies;
- Technical proficiency with PHP and MySQL for server-side development, advanced JavaScript utilization on the client side;
- Strong abilities with blockchain technology engagement, including smart contracts and wallet development using Solidity, Hardhat, Truffle, WalletConnect, and Metamask SDK;
- Experienced with libraries Web3.js, and Ethers.js;
- Ability to work Ethereum Blockchain, Binance Smart Chain (BSC), with different wallets including MetaMask;
- Adept at working with a variety of frameworks and languages beyond core competencies, such as Laravel, Solidity, Node.js, and C++;
- Up-to-date with modern practices, possessing comprehensive experience in codebase upgrades, performance optimization, and integrating third-party APIs;
- Successfully led a development team, demonstrating strong leadership and project estimation skills.
Work Experience
Full-stack Developer, Web Applications Development and Maintenance
Duration: February 2023 — March 2024
Summary: Developing and maintaining web applications with a focus on both front-end and back-end components, ensuring efficient data storage and retrieval, as well as optimizing performance and user experience.
Responsibilities: Developing front-end and back-end components, estimating tasks, code review, refactoring and optimizing applications, implementing various features and functionalities, and updating codebases.
Technologies: PHP, MySQL, Laravel, Git, Bitbucket.
Blockchain Solidity Developer, Blockchain Projects
Duration: August 2021 — January 2023
Summary: Developing blockchain solutions such as smart contracts, payment processor services, wallets, and blockchain explorers, in addition to setting up blockchain networks.
Responsibilities:
As a main engineer developed more than 10 Solidity Smart Contracts:
- Default ERC-20, ERC-721 Tokens (OpenZeppelin library);
- ERC-20 with fees, and unique rules of distribution and adding funds to liquidity pools;
- Staking pools, Time-based reward pools.
Projected and created Dapps for the smart contracts:
- Connection with different wallets, like Metamask, TrustWallet, e.g.;
- Storing user data in databases/blockchain;
- Executing smart-contract functions (approve, buy tokens, transfer, add liquidity into the pool, withdrawals, e.g);
- Created frontend, backend, API for Dapp using Laravel, Bootstrap 4/5, and paid themes from Themeforest.
Developed microservices and APIs for collecting and filtering blockchain logs (NodeJS+MongoDB) Created environments for all projects:
- Setting up servers – DigitalOcean, Hetzner Dedicated;
- Services – Cloudflare, QuickNode, Infura, Block.io, different APIs;
- Blockchain nodes – Ethereum, Ethereum Classic, Binance Smart Network, Bitcoin.
Developed bots for
- Telegram;
- Discord.
Projects:
- Livenodes Token (LNOT) – ERC-20 (Ethereum Chain) - https://twitter.com/LiveNodes;
- XoXo Smart Contract – BEP-20 (Binance Smart Network) - https://xoxobusd.com/ - Token, Staking Pool, distributing of funds between all of the stakers, funds go from exchange fees on Pancakeswap liquidity pool;
- FriendsTree Smart Contract – paid ladder entry filled with the next two users joining after you, making you earn and rejoin into ladder;
- RewardDao Smart Contract – Vote to Earn project, using snapshot feature, holding token you able to vote for the options provided by token founders – was created to invite people to other projects;
- Web3 Smart Contract – https://web3smc.net sponsor and referral-based system, on-chain distribution of funds between members based on their position in the matrix;
- LegacyStake Token (LST) and Smart Contract - https://legacystake.com/ for staking and Matrix distributing funds – different sponsor-referrals-based pools, and online casinos as use cases.
Technologies: Solidity, NodeJS, PHP, C++, JS, CSS DB: MongoDB, MySQL Env: Hardhat, Truffle, Remix, MERN, LAMP, LEMP, MERN Libraries: Ethers.js, Web3.js, Metamask SDK, WalletConnect DSK Blockchain: Ethereum, Ethereum Classic, BSC, Tron, Bitcoin.
Full-stack Developer, Freelance Full-stack Development
Duration: December 2013 — July 2021
Summary: Executed various freelance projects involving e-commerce solutions, web development platforms, search engines, and systems for product search and sales.
Responsibilities: Developing e-commerce sites, setting up WordPress sites, plugin development, theme creation, developing a rental search engine web application, and creating a system for auto parts search and sales.
Technologies: PHP, HTML & CSS, JavaScript, OpenCart 3, WordPress, Codeigniter 3.