Robin Oppenstam
Full Stack Developer & Web3 Fanatic
From sales to code, building dApps and learning something new every day.
Portfolio Projects
Simple DEX
A full-stack decentralized exchange live on Sepolia testnet. Features multi-hop routing for optimal swap paths, real-time Chainlink price oracles, and seamless liquidity provision. Users can trade across 10+ pairs with 6 tokens (USDC, USDT, DAI, WETH, WBTC, LINK), provide liquidity to earn fees, and track positions with live USD values. Built with security-first approach using OpenZeppelin contracts, slippage protection, and comprehensive input validation.
Predicton Market
A decentralized prediction market platform where users bet on real-world events using blockchain technology. Features pool-based betting with dynamic odds, automated market resolution via Chainlink price feeds, and multiple market types including daily Bitcoin over/under and price race markets. Built with Solidity smart contracts using Foundry for testing and deployment. Frontend developed with Next.js and TypeScript for seamless Web3 betting interactions. Deployed on Sepolia testnet.
DealtrackR
A fullscale SaaS helping crypto investors track seed rounds and manage their portfolio with 200+ registered users. Provides comprehensive tracking of vesting schedules, real-time price performance, and portfolio value through interactive dashboard and chart views. Features user authentication, project databases handled by Firebase, Stripe payment processing, and real-time price data via CoinMarketCap API. The frontend is built with Next.js, while the backend uses Node.js and Express.
Cydonia Staking Protocol
A demo DeFi staking protocol enabling users to stake multiple assets (ETH, USDC, USDT, and custom CDN token) to earn yield in CDN rewards. Features dynamic reward calculations based on asset type and staking duration, implemented through Solidity smart contracts with comprehensive testing via Foundry. Frontend built with Next.js, TypeScript, and wagmi for intuitive staking interactions. Deployed on Sepolia testnet.
Blacksmith NFT game
A demo NFT crafting game where users can mint, trade, and combine NFTs to create new items. Built with Solidity smart contracts using Foundry for testing and deployment. Integrates Chainlink VRF for randomness in item crafting and OpenZeppelin libraries for secure NFT standards. Frontend developed with Next.js, TypeScript, and wagmi for seamless Web3 interactions. Deployed on Avalanche C-chain.
Defi Lending Protocol
A decentralized lending protocol demo enabling users to lend and borrow multiple assets (ETH, BTC, USDC, USDT) with cross-asset functionality. Built with Solidity smart contracts using Foundry for testing and deployment. Integrates Chainlink CCIP for cross-chain operations and Uniswap for automated token swaps. Frontend developed with Next.js, TypeScript, and wagmi for seamless Web3 interactions. Deployed on Sepolia testnet.
About Me
I'm a Swedish developer with a background in sales who discovered blockchain in 2021 and quickly became fascinated by its potential to reshape how we interact online. That curiosity led me to take a major leap, leaving my sales career to dedicate myself fully to learning how to code. It has been a challenging yet incredibly rewarding journey of constant growth and discovery.
Over the past year, I've focused on developing full-stack Web3 projects that integrate Solidity smart contracts with modern, responsive frontends built in React and Next.js. My portfolio includes testnet dApps and a SaaS product, each designed to deepen my technical expertise and explore practical blockchain use cases. I enjoy working across the stack and thrive where traditional web development meets decentralized innovation.
I'm now looking to collaborate on projects, either as part of a development team or with clients seeking freelance support, where I can contribute to meaningful, high-impact work while continuing to grow as a developer. I bring curiosity, adaptability, and a strong work ethic to every project, along with a passion for creating solutions that are both functional and forward-thinking.
Beyond coding, I'm deeply interested in decentralization, privacy, and emerging tech trends in AI. I also enjoy fitness, biohacking, and traveling, always looking for new ideas and perspectives to bring into my work.
Core Technologies
Certificates & Achievements
Responsive Web Design
freeCodeCamp
Completed: 08/12/2024
Frontend Developer Path
Scrimba
Completed: 03/08/2025
Solidity Smart Contract Development
Cyfrin
Completed: 08/11/2024
Full-Stack Web3 Development Crash Course
Cyfrin
Completed: 20/04/2025
Aave V3 Protocol Development
Cyfrin
Completed: 12/09/2025
Advanced Web3 Wallet Security
Cyfrin
Completed: 26/09/2025
Let's Connect
Interested in working together? I'm eager to contribute to meaningful projects and learn from experienced developers.