Julian Ruiz
About
Detail
Senior Full Stack Engineer | Blockchain & Fintech
Antioquia, Colombia
Contact Julian regarding:
work
Full-time jobs
Flexible work
Finding co-founders
groups
Networking
Résumé
Jobs
verified_user
60% verified
- ISmart Contracts & Web3 Full Stack Development verified_user Verified experience public Remote experienceInvestment ArmendarizAug 2025 - Current (11 months)Implemetation of DeFi platform focused on governance, vault infrastructure, treasury systems, and on-chain operational controls, contributing across smart contracts, frontend architecture, and protocol security. Contributed to: • Smart contract development in Solidity • Vault architecture and governance systems • Modular frontend implementation using React and TypeScript • Web3 integration and hook-based frontend architecture • Treasury systems and operational control development • Unit testing, fuzzing, stateful and stateless testing • Security analysis using Slither and Aderyn • Protocol architecture optimization, maintainability, and scalability improvements
Technical Instructor — Full Stack Development public Remote experienceHenryJan 2023 - Current (3 years 6 months)Mentored and guided students in full stack development projects, covering backend architecture, REST API integrations, frontend development, and database management. Provided technical guidance in: • Node.js • Express.js • React.js • RESTful APIs • Authentication flows • Frontend/backend integration • Database design Assisted students in debugging, software engineering best practices, and scalable application architecture.- Blockchain Full Stack Developer Web3 verified_user Verified experience public Remote experienceFreelancerJan 2022 - Current (4 years 6 months)Designed and developed multiple blockchain and Web3 applications focused on DeFi infrastructure, NFTs, tokenized platforms, governance systems, healthcare services, payment integrations, and decentralized applications. Worked across smart contract architecture, security-focused development, frontend applications, backend integrations, wallet connectivity, and blockchain infrastructure, contributing to the full lifecycle of decentralized products. Main Contributions • Developed smart contracts using Solidity and OpenZeppelin standards • Built ERC20, ERC721, and subscription-based blockchain systems • Implemented wallet integrations with MetaMask and Web3 providers • Developed decentralized applications using React, Ethers.js, wagmi, and mo
- Full Stack Developer — Fintech & Crypto Integrations verified_user Verified experience public Remote experienceVITA WALLETOct 2021 - Nov 2025 (4 years 2 months)Worked on the development and maintenance of fintech and crypto-related platform features, focusing on API integrations, payment infrastructure, and scalable backend services. Contributed to: • Third-party API integrations • Binance-related integrations • Payment processing systems • Backend services and microservices architecture • Frontend and backend feature development • Unit and integration testing • Platform stability and performance improvements
- Trading AnalystFreelancerJan 2016 - Dec 2020 (5 years)Experienced in trading across different financial markets, with strong knowledge of both technical and fundamental analysis. Skilled in market structure analysis, trend identification, risk management, price action, and macroeconomic factors affecting market movements. Familiar with crypto, forex, and traditional markets, combining analytical thinking with data-driven decision making.
Education
verified_user
40% verified
- LEnglish Language and Literature, General verified_user Verified experienceLondon School of Commerce, London, United KingdomMay 2025 - Aug 2025 (4 months)
- Smart Contract Security verified_user Verified experience public Remote experienceCyfrin UpdraftOct 2024 - Jun 2025 (9 months)Gained hands-on experience auditing smart contracts, identifying vulnerabilities, and writing secure, optimized Web3 protocols. Applied fuzzing, invariant testing, and formal verification techniques to uncover bugs and strengthen protocol security before production deployment.
- Full Stack DeveloperHenryJan 2021 - Aug 2021 (8 months)
- Ingeniería, Telecommunications Technology/TechnicianInstitucion Universitaria ITMJun 2008 - Dec 2011 (3 years 7 months)The Telecommunications Technologist from ITM is qualified to design, implement, manage, and optimize technological systems, networks, and infrastructures that support modern digital services and distributed environments. Their academic background enables them to develop comprehensive solutions focused on connectivity, security, automation, and the integration of Information and Communication Technologies (ICT), while applying technical, ethical, and sustainability principles in compliance with current standards and regulations. Additionally, they possess the ability to analyze complex technological architectures, contribute to the development and integration of emerging technologies —including distributed systems, blockchain, and digital i
- bases de datosUdemy
Projects (professional or personal)
verified_user
0% verified
- Blockchain Voting System DeveloperProyecto personalNov 2021 - Dec 2021 (2 months)Developed a blockchain-based lottery platform focused on decentralized participation, smart contract automation, and tokenized reward distribution. Built and integrated: • Smart contracts using Solidity • ERC20 token reward mechanisms • Random winner selection logic • Wallet transaction signing with MetaMask • Web3 frontend integrations • JSON-RPC communication flows The platform allowed users to participate anonymously through blockchain-based wallet interactions while ensuring transparency and decentralized lottery management.