Emilian – Express.js, React, JavaScript

The project is a document management tool, specifically designed for the geospatial industry.

• built Angular applications;
• built Node.js + Express.js APIs;
• analyzed and improved code quality and performance;
• researched for new engineering ideas and concepts, applicable for enhancing scalability, performance, stress resistance, optimization, etc.;
• performed daily code reviews.

A SPA for a sentinel node sales campaign on Arbitrum network. About 95% of the app is done, it still needs some minor changes before making it official to the community.

• built an upgradeable smart contract used for on the web application;
• debugged and tested the smart contract via unit tests;
• deployed and verified the smart contract on Arbitrum testnet and mainnet;
• build the web application in Next.js with TypeScript;
• integrated the smart contract on the application using Wagmi and RainbowKit

A crypto game available on Polygon. Here a user can compete in exciting arenas against other players, breed new generations and win races to earn prizes, earn passive income by owning arenas, etc.

• designed, built, tested, debugged, deployed, and maintained the smart contracts, using: Solidity, Hardhat and ethers.js;
• helped the front-end team with blockchain-related code implementations, regular code implementations, code improvements, UI/UX advice, and help;
• had a decisional impact regarding the project future;
• built, tested, and debugged the back-end, using Node.js + Nest.js;
• system designed the project for multi-blockchain compatibility;
• wrote extensive unit, integration, and e2e tests.
• used multiple database technologies, such as: MariaDB, PostgreSQL and SQLite(for testing environment);

An AI-automated marketing platform for small and medium size businesses.

• created front-end and back-end architecture, mainly working with React.js + Redux and Node.js + Express.js + Apollo GraphQL;
• built front-end components library;
• debugged and resolved the application issues;
• wrote unit, integration, and e2e tests;
• implemented different third-party-based features on the app;
• implemented numerous automated bots.
• built AI-based automations;

A crypto bot designed to automate the trading of ERC20/ERC721/ERC1155 tokens.

• created the back-end architecture;
• debugged and resolved the bot issues;
• wrote unit and integration tests;
• integrated with different providers.

Borrow ETH by using your NFT as collateral. Lend and earn for providing liquidity on the marketplace.

• designed, built, tested, debugged, deployed and maintained the project smart contracts;
• designed, built, tested and debugged the back-end architecture;
• helped the front-end team with blockchain related code implementations, regular code implementations, code improvements, UI/UX advice and help;
• wrote unit, integration and e2e tests;
• system designed the project for multi-blockchain compatibility;
• had decisional impact over the project and the company in general;

A low-code blockchain development platform. Here a user can configure, deploy, and integrate the blockchain layer with no need to dedicate significant time, talent, and money.

• designed the entire project as a multi-blockchain platform;
• built, tested, and debugged the front-end and back-end architecture, mainly using React.js + Redux and Node.js + Express.js;
• selected, published, and maintained smart contracts on the platform's public smart contracts marketplace;
• provided code updates and implemented new features along the way;
• wrote unit, integration, and e2e tests;
• integrated both front-end and back-end with multiple blockchain networks;
• upgraded the platform functionality to support both public and private blockchains;
• designed, built, tested, debugged, deployed and maintained smart contracts on both public and private blockchain networks available on the platform;

A decentralized marketplace for tourists in France. Features include gift cards, loyalty cards, single-use vouchers, subscription vouchers, permanent discounts, etc.

• built the front-end and back-end architecture, mainly working with React.js + Redux and Node.js + Express.js;
• debugged and resolved the application issues;
• wrote unit, integration, and e2e tests;
• designed the application to support multiple blockchain networks;
• improved the initial UI/UX, according to the users feedback;
• designed, built, tested, debugged, deployed, and maintained the smart contracts used;
• integrated the app on the company private blockchains ecosystem;

A decentralized platform designed for tourist attractions, where users can book visits to some locations and can get/win/purchase vouchers or coupons to spend during their trip.

• created front-end and back-end architecture;
• built front-end components library;
• debugged and resolved the application issues;
• wrote unit, integration, and e2e tests;
• designed, built, debugged, tested, deployed, and maintained the project-related smart contracts.

An app initially designed for a hotel from Bucharest which was later turned into a bigger & customizable platform as a decentralized SaaS solution for other hotels which were interested in blockchain technology. Most of the core app functionalities were blockchain-based, the smart contracts were built in Solidity and the network used was a private Quorum network. The back end was built using Node.js + Express.js and the front end was built using React with React Hooks. Typescript has been used on both ends. The client was very happy with the product delivered.

• created front-end and back-end architecture, mainly using Node.js + Express.js and Vue.js + EJS;
• built front-end components library;
• debugged and resolved the application issues;
• wrote unit, integration, and e2e tests;
• designed, built, debugged, tested, deployed, and maintained the project-related smart contracts.