Contact
Create the Future of Decentralized Technology Together
Feel free to reach out for collaborations, projects, or just to say hello — I’m always excited to connect and explore new opportunities.
Transforming ideas into immutable realities
Blockchain technology turns concepts into permanent, tamper-proof records, shaping the future of digital interaction
5+
Years Experience
100+
Projects Completed
50+
Happy Clients
About
Passionate about building innovative blockchain solutions and scalable full-stack applications that drive the future of decentralized technology
About Me
Blockchain & Full Stack Developer
I am a passionate developer with over 10 years of experience in full-stack development and 6+ years specializing in blockchain technology. I focus on building secure smart contracts, scalable decentralized applications, and seamless Web3 integrations that empower users and businesses to unlock the true potential of blockchain.
Driven by innovation and security, I strive to create decentralized solutions that redefine trust and transparency in the digital world.
Name
Leonard Macaraeg
Phone
+639306395467
Age
35 Years
Email
leonardmacaraeg1004@gmail.com
Occupation
Software Engineer
Nationality
Philippines
HTML
90%CSS
90%JavaScript
80%Bootstrap
55%React
90%Tailwind CSS
90%Node.js
80%ExpressJS
55%Solidity
90%Rust
90%Web3.js
80%Ethers.js
55%Anchor
90%Python
90%Java
80%Resume
Open, verifiable systems empower communities and unlock new possibilities for collaboration.
Work Experience
Blockchain technology turns concepts into permanent, tamper-proof records, shaping the future of digital interaction.
Company A
Jun, 2023 - CurrentSenior Blockchain Developer
- Designed and deployed secure Solidity-based smart contracts for ERC-20, ERC-721, and ERC-1155 standards, enabling token creation, staking, and NFT functionality.
- Built scalable decentralized applications (dApps) using React, Next.js, and Node.js, integrating Web3.js and Ethers.js for seamless blockchain interactions.
- Developed a DeFi platform enabling token swaps, staking, and yield farming on Ethereum and Polygon, achieving a 40% increase in user participation.
- Optimized gas fees in Ethereum smart contracts by 25% through efficient coding practices and gas optimization techniques.
- Deployed Rust-based smart contracts on Solana, enabling low-cost, high-speed transactions for NFT marketplaces and DeFi platforms.
- Integrated decentralized storage solutions using IPFS to store NFT metadata and other off-chain resources securely.
- Conducted smart contract audits to identify and resolve vulnerabilities, ensuring secure deployments on Ethereum mainnet.
Nullam Corp
2019 - 2023Senior graphic design specialist
- Developed an NFT marketplace with React, Next.js, and Node.js, allowing users to mint, buy, and trade NFTs on Ethereum and Polygon networks.
- Built and deployed ERC-20 and ERC-721 smart contracts, implementing custom tokenomics and NFT functionality.
- Integrated blockchain wallets like Metamask, Phantom, and WalletConnect, improving user accessibility and transaction signing.
- Used GraphQL and RESTful APIs to fetch blockchain data and display real-time information on dApp dashboards.
- Designed and implemented a staking platform using Solidity, enabling users to earn rewards by locking tokens in smart contracts.
- Automated deployment pipelines for blockchain projects using Hardhat, Truffle, and GitHub Actions.
- Collaborated with cross-functional teams to design tokenomics for token launches, raising over $3M in initial token offerings (ICOs/IDOs).
Stepping Stone Ltd.
2015-2019Graphic design specialist
- Developed a decentralized financial forecasting platform using Java, Spring Boot, and Angular, integrated with Ethereum smart contracts for secure data sharing.
- Deployed and maintained smart contracts for supply chain tracking, enabling transparency and reducing fraud for enterprise clients.
- Designed and optimized database schemas in PostgreSQL to store off-chain data, improving query performance by 30%.
- Implemented authentication mechanisms using OAuth 2.0 and blockchain wallet-based logins for secure user access.
- Built reusable Angular components for blockchain dashboards, enabling faster feature development and improved UX.
- Integrated IPFS for decentralized document storage in supply chain and data-sharing applications.
- Conducted blockchain workshops and training sessions for junior developers, enhancing team proficiency in blockchain technologies.
Stepping Stone Ltd.
2015-2019Graphic design specialist
- Assisted in building decentralized applications (dApps) using Solidity and Web3.js, focusing on Ethereum-based token sales and ICOs.
- Built user interfaces using React and Bootstrap, ensuring responsive and seamless user experiences.
- Tested and deployed smart contracts on Ethereum testnets, ensuring functionality and security before mainnet launches.
- Gained hands-on experience in integrating blockchain wallets like Metamask and processing transactions.
- Supported the development of blockchain-based voting applications, ensuring secure and immutable voting records.
- Collaborated with senior developers to troubleshoot and resolve smart contract-related bugs.
My Education
Through cryptography and decentralization, we create digital spaces where users control their data and assets.
Holy Angel University
2013-2017Bachelor's Degree of Computer Science
Portfolio
Decentralized networks connect people worldwide on a foundation of security and openness.
- All Work
- Web Design
- Graphics
- Motion
- Branding
NFT
Simple Solana NFT Marketplace
Maecenas faucibus mollis interdum sed posuere consectetur est at lobortis.
NFT
Soft COQ Marketplace
Vestibulum id ligula porta felis euismod semper at vulputate.
Motion
Solana Trading Bot
Donec ullamcorper nulla non metus auctor fringilla dapibus.
Branding
SPL Token Staking
Aenean lacinia bibendum nulla sed consectetur elit.
Web Design
Solana Dice Game
Nullam id dolor id nibh ultricies vehicula ut id elit.
Graphics
Ethereum Whale Traking App
Cras mattis consectetur purus sit amet fermentum.
Services
By removing intermediaries, we build systems based on trust, transparency, and shared control.
Empowering Your Vision Through Tailored Technology Solutions
Combining creativity and technical expertise to develop applications that truly resonate and perform.
Smart Contract Development
Designing and deploying secure, efficient smart contracts to automate trusted transactions on blockchain networks.
Decentralized Application (dApp) Design
Creating intuitive and scalable decentralized applications that leverage blockchain for enhanced transparency and control.
Blockchain Integration & API Development
Seamlessly integrating blockchain functionalities with existing systems through custom APIs and middleware solutions.
Full Stack Web & Mobile Development
Building robust front-end and back-end solutions with modern frameworks for responsive and performant user experiences.
Frequently Asked Questions
Open ledgers illuminate every transaction, fostering trust and innovation at unprecedented scales.
What kinds of blockchain projects do you develop?
I develop a wide range of blockchain projects including smart contracts, decentralized applications (dApps), token creation (ERC-20, ERC-721 NFTs), DeFi protocols, and blockchain integrations with existing web and mobile apps.
What programming languages and frameworks do you use for blockchain development?
For blockchain, I primarily use Solidity for Ethereum smart contracts, along with tools like Hardhat, Truffle, and Ethers.js. For front-end integration with Web3, I use React, Next.js, and Web3.js or Ethers.js.
How do you ensure the security of smart contracts and blockchain applications?
Security is paramount in blockchain development. I follow best practices like thorough code audits, unit and integration testing, using well-audited libraries, and deploying contracts on testnets before mainnet launch. I also stay updated on known vulnerabilities and mitigation techniques.
Can you integrate blockchain features into existing web applications?
Yes, I can seamlessly integrate blockchain functionality such as wallet authentication, token transactions, and smart contract interactions into existing web or mobile applications to enhance their capabilities with decentralized features.
How long does it typically take to develop a blockchain or full stack project?
Project timelines vary depending on complexity. Simple dApps or websites can take a few weeks, while more complex decentralized platforms or full stack applications may take several months. I provide clear estimates after understanding your project requirements.
Do you offer post-launch support and maintenance?
Absolutely. I provide ongoing support, bug fixes, and updates after project launch to ensure your blockchain and web applications run smoothly and stay secure.