andresf2448
Blockchain Engineer | Smart Contract Solidity | Full Stack Web3 Developer | Mathematician
Blockchain-focused Full Stack Web3 Engineer and Mathematician specializing in Solidity smart contracts, DeFi protocol architecture, vault and governance systems, treasury operations, wallet integrations, and secure decentralized applications. Experienced building production financial applications with Ruby on Rails, React, React Native, Node.js, PostgreSQL, JavaScript and TypeScript. Strong smart contract security foundation using Foundry testing workflows, fuzzing, invariant/stateful testing, Slither and Aderyn. Background includes teaching JavaScript, Python, Solidity, mathematics and programming to large student cohorts, combining engineering execution with clear technical communication.
Experience: 3 years
Yearly salary: $84,000
Hourly rate: $45
Nationality: 🇨🇴 Colombia
Residency: 🇨🇴 Colombia
Experience
Full Stack Developer Solidity - Blockchain Healthcare Platform
Freelance / Independent 2022 - 2022
Built a blockchain-based healthcare system using Solidity smart contracts, React, Ethers.js and MetaMask JSON-RPC connectivity. Implemented administrator-created basic services and laboratory-created specialized services through subscription smart contracts. Created an ERC20 platform token using OpenZeppelin standards; used Truffle, Web3.js, Chai, React, CSS and Material UI.
Full Stack Developer Solidity - Rocket Punk NFT Platform
Freelance / Independent 2022 - 2022
Developed an NFT platform where users can mint unique NFTs and transfer ownership on-chain. Implemented ERC721 standards through OpenZeppelin, Solidity, Hardhat, Web3.js, Chai, React, MetaMask and CSS.
Full Stack Developer Solidity - Decentralized Voting System
Freelance / Independent 2022 - 2022
Implemented a blockchain voting application for candidate registration and one-vote-per-user participation. Integrated Solidity, Hardhat, Ethers.js, Chai, React, MetaMask, IPFS and OpenZeppelin for transparent and immutable election records.
Full Stack Developer Solidity - Lottery DApp
Freelance / Independent 2021 - 2021
Built a blockchain lottery application that stores participation on-chain and selects a random winner. Implemented ERC20-style reward logic using Solidity, Hardhat, Ethers.js, Chai, React, MetaMask and CSS.
Full Stack Developer
RocketXChange 2021 - 2021
Created a blockchain exchange platform connecting users to the Stellar network to exchange fiat and cryptocurrency assets. Implemented JavaScript, React, Redux, Node.js, Express.js, Supabase, Material UI, CSS, Socket.IO, Stellar SDK and OCR-based functionality.
Full-Stack Teaching Assistant
Henry 2021 - 2021
Coordinated Full Stack bootcamp student groups, reinforced module topics, guided early course progression and supported pair-programming collaboration. Facilitated review sessions and proposed improvements to bootcamp learning processes.
Full-Stack Developer - Bootcamp Project
Henry 2021 - 2021
Developed a Single Page Application using React, Redux and CSS with a Node.js/Express backend. Extended The Dog API with filtering, sorting and breed-creation features backed by Sequelize and PostgreSQL.
Frontend Developer Freelancer - Digital Content Adaptation
Vista Higher Learning 2021 - 2021
Adapted and managed digital content using CMS platforms, ensuring structure, compatibility and correct visualization. Executed QA processes to validate functionality, consistency and compliance with digital content standards.
Mathematics Instructor
Corporacion Polisocial 2021 - 2021
Taught PreICFES preparation focused on mathematical reasoning, logic and general mathematics. Created exercises, mock exams and learning strategies to improve student performance in standardized tests.
Full Stack Developer
Vita Wallet 2021 - 2025
Implemented web and mobile features for financial applications using Ruby, Ruby on Rails, React, React Admin, React Native and JavaScript. Integrated third-party services and APIs including Binance, blockchain services, payment platforms, banks and international payment providers. Maintained and optimized existing application code, improving platform stability and scalability. Developed unit and integration tests to validate security, reliability and correct behavior across financial workflows.
Programming Languages Instructor
Independent 2020 - 2021
Taught programming and software development with practical focus on Python, JavaScript, Solidity, C and C++. Designed and delivered a four-month Python programming course including academic content, exercises and continuous student support.
JavaScript Instructor / Teaching Lead
Coderhouse 2020 - 2024
Delivered remote JavaScript classes through synchronous and asynchronous learning activities. Planned and taught classes, coordinated tutors and supported student learning processes. Led cohorts and tutor teams, guiding more than 5,000 students through JavaScript and programming fundamentals.
Mathematics Instructor - Pre-university Program
Universidad de Antioquia 2017 - 2020
Prepared students for Universidad de Antioquia admission exams using official academic guidelines. Developed study methodologies and collaborative learning dynamics for logical reasoning and problem solving.
Mathematics and Physics Teacher
UPET 2015 - 2021
Taught secondary-level mathematics and physics, strengthening logical, analytical and scientific thinking. Designed exercises, workshops and practical activities adapted to different learning levels.
Skills
blockchain
blockchain-engineer
defi
hardhat
javascript
math
node
python
react
ruby
smart-contract
solidity
teaching
treasury
typescript
english
spanish