English:
Upper Intermediate
Mario Sergio A.
Vetted by YouTeam
Ecuador
UTC -05:00
America/Guayaquil
English:
Upper Intermediate
Full-stack JavaScript/blockchain Developer
Sr Full stack JavaScript Developer with expertise using React, Angular, Node, TypeScript, .NET, C# etc. I'm also a blockchain developer of over 4 years of experience with Solidity, Smart contract development, Ethereum & Blockchain. Experience in Developing, Testing, Deploying decentralized.
Want to hire this engineer?
Check if Mario Sergio is availableExpertise
Years of commercial development experience
10 years of experience
Core technologies
Other technologies
Project Highlights
Zipdev project
Jul `22 - Oct `22
3 months
Zipdev
LMS (Loan management system), Modern health finance based on microservices architecture which built in angular for front-end, in NodeJS/NestJS framework for backend.
Responsibilities & achievements
- Implemented the complex logic of LMS. - Rebuilt & converted LMS codebase from monolithic app to one based on micro services architecture. - Implemented the database migration from mongoDB to PostgreSQL. - Tech stack: Node/NestJS, AngularJS, Typescript, Plaid API, PostgreSQL.
RAIR Technologies Project
Apr `22 - Jul `22
3 months
RAIR Technologies Inc
The project consisted on building smart contracts of NFT minter marketplace and resale marketplace
Responsibilities & achievements
- Used OpenZeppelin standard like ERC 777 (RAIR Token), ERC 721, and implemented Royalty payment by ERC2981 standard. - Implemented unit test of NFT marketplace smart contracts Audited smart contracts by Mythx tool. - Tech stack: Solidity, Remix, Web3, EthersJS, Mocha, Binance, Polygon.
BooFinance App
Feb `22 - Present
3 years
BooFinance
Worked on Building dApp for staking, farming and rewarding.
Responsibilities & achievements
-Mostly engaged in developing web solutions based on front-end and smart contract Built dApp using web3, RxJS and Angular12, and integrated dApp with Moralis backend Developed smart contracts by OpenZeppelin standard token libraries in solidity. -Developed custom tokens - $Boofi and $zBoofi for staking & rewarding in BooFinance and implemented Unit-testing, deploying, verifying and auditing smart contracts Implemented the strategies for staking, rewarding and yield farming. -Tech stack: web3, RxJS, Angular 12, Solidity, moralis, EthersJS.
Various Projects
Aug `21 - Feb `22
6 months
Netlife Ecuador
Various projects.
Responsibilities & achievements
- Analysis and development of new products for customer satisfaction and provide a better experience. - Follow up on projects and improvements required by management or customer. - Built new functionalities for the app net life tracking. Develop Microservices for collection management and payment security. - Tech stack: ASP.NET MVC, ASP.NET Core, Angular, NodeJS, JavaScript, Oracle DB.
Hifi Finance project
Feb `21 - Nov `21
9 months
Hifi Finance
Mostly engaged in developing smart contract, in forking DeFi swapping, in integrating blockchain with frontend and backend.
Responsibilities & achievements
- Developed smart contracts according to the requirements and unit-tested & deploying them. Implemented forked protocols like Uniswap, PancakeSwap, used autofarm for Yield farming. - Integrated Paraswap SDK for DeX aggregation. - Helped to create random NFT metadata using script based on Node Developed RESTful APIs using Node.JS and GraphQL. - Integrated payment APIs (CoinGate, Coinbase) for transactions in bitcoin and other cryptocurrencies. - Tech stack: ReactJS, NodeJS, Solidity, Web3, Remix, Mocha, Ganache.
Gizlo Project
Oct `20 - Aug `21
10 months
Gizlo
Web and mobile app development.
Responsibilities & achievements
- Development with Java (Java EE, Spring Boot) PHP (Symfony, Bootstrap, CSS, HTML) Frontend (Angular, React, Ionic, React Native) .NET (.NET Framework, .NET Core. - Development of Services and Micro-services. - Tech stack: ASP.NET, PHP, Micro services, AngularJS, React-native, XML and DB Oracle.
Ethereal Engine Project
Apr `19 - Dec `20
2 years
Ethereal Engine
Worked on a large social network with a lot of active members in the team and have delivered many website & applications using various web tech.
Responsibilities & achievements
- Engaged in developing web solutions based on front-end, backend and blockchain. - Writing scripts using Web3, Ethers.js. - Used ERC20, ERC721, ERC1155, OpenZeppelin standard libraries for building smart contracts in solidity. - Unit-testing & Deploying & Verifying the different smart contracts according to the client's requirements. - Modified the smart contract of synthetic for staking. - Implemented forked protocols like Uniswap, PancakeSwap, used autofarm for Yield farming. - Developed NFT marketplaces, collections and auction blockchain using node, react, web3, ethers.js and solidity. - Tech stack: ReactJS, NextJS, NodeJS, Solidity, Web3, EthersJS.
iRoute Project
Jul `17 - Jul `18
1 year
iRoute Solution S.A
Migration and modernization project of a financial transaction/payment management system.
Responsibilities & achievements
- Development of components to replace procedures (SP). In charge of migration and batch system integration (workbatch to corebatch), adjustments in stored procedures, crystal reports and file generation. Knowledge of PCI DSS 3.0 standards for card information control in transactional systems. - Tech stack: Integration Service, CLI .NET, SQL Server.
TechSoft Project
Apr `14 - Dec `16
3 years
TechSoft S.A
Development & Maintenance of Syscard Application.
Responsibilities & achievements
- Development & Maintenance in Visual Basic and .NET. - Development of Stored Procedures / Scripts. - SQL SERVER Database Management. - Transac Server Process Analysis. - Syscard Web Project Leader. - Analysis processes and database. - Batch system management. - Development & Maintenance – Syscard SuperPuntos Application. - Development of Procedures. - Configuration and management of IIS (Internet Information Services). - Analysis and maintenance of SQL applications and processes. - Tech stack: ASP.NET, MVC, Visual Basic, API Rest, SOAP Services.
Education
Higher education in Computer Science
Agency
10-50
GMT-5
Lima, Peru
Core Expertise
Industries
Architecture & Design, E-Commerce & Retail, Information services & Technologies, Construction & Real estate, Data Science & Machine Learning, Branding, design, web development
Want to hire this engineer?
Check if Mario Sergio is available