Jakub – Solidity, Ethers.js, Smart contracts

A Polish educational platform and blog focused on Generative AI, offering daily industry news, practical prompting guides, and a curated library of tested prompts to help everyday users master tools like ChatGPT and Midjourney.

• Product & Architecture Management: Led the end-to-end Product Management and Software Design, translating business requirements into a scalable full-stack architecture;
• Frontend Development: Developed a fully Responsive Web Design using React, TypeScript, and Tailwind CSS, and utilized Webpack for build optimization. I also implemented advanced, dynamic data visualizations using D3.js;
• Backend & Infrastructure: Architected and managed the database schema with PostgreSQL and Prisma, and utilized Directus for content management. I oversaw the DevOps workflow by containerizing the application with Docker and establishing automated CI/CD pipelines;
• AI & Real-Time Features: Engineered the platform's core AI capabilities by integrating GPT-5 and implementing WebSockets to enable real-time, low-latency communication between the user and the model;
• Third-Party Integrations: Integrated critical external services, including the Stripe API for secure payment processing and Google APIs to extend the platform's functionality.

A gamified trading protocol on the Hyperliquid blockchain that lets users speculate with ultra-short-term, high-leverage options—essentially turning high-risk crypto derivatives into a fast, arcade-style experience.

• Backend & Blockchain Infrastructure: Engineered a high-performance blockchain indexer using Nest.js and TypeScript, designed to aggregate and process real-time events from Smart Contracts to ensure accurate data consistency;
• Smart Contract & Protocol Engineering: Expanded the core HyperEVM protocol by developing and optimizing Smart Contracts in Solidity. Additionally, I architected an off-chain orderbook to enable high-frequency trading capabilities essential for the platform's volatility-focused model;
• Frontend Redesign & Visualization: Led the complete overhaul of the trading application's frontend using Next.js, React, and React Hooks. This included building complex, interactive charts to visualize market data and trading positions effectively;
• Web3 Integration: Utilized Ethers.js to seamlessly integrate the frontend with the blockchain, managing wallet connections and transaction signing to ensure a smooth user experience.

A leading DeFi dashboard that provides a unified interface for managing loans, leverage, and automated yield strategies across multiple protocols, offering advanced one-click features that bundle complex transactions into a single action.

• V2 Leverage Architecture: Architected and developed the smart contracts for the V2 leverage trading platform, built on top of decentralized CDP vault infrastructure and enhanced with Aave Flashloans to maximize capital efficiency;
• Protocol Integration & Expansion: Expanded platform capabilities by integrating major DeFi protocols (Aave, Compound, Morpho) and led the multi-chain expansion to Layer 2 networks including Base, Optimism, and Arbitrum;
• Composable Strategy Ecosystem: Co-created a modular smart contract ecosystem that enabled the dynamic creation of custom investment strategies via composable on-chain functional blocks;
• DevTools & Security: Built the core SDK and comprehensive testing environment, ensuring system reliability through successfully navigating rigorous external security audits (e.g., with Chain Security).

A leading Ethereum Decentralized Finance (DeFi) protocol that issues over-collateralized, community-governed stablecoins maintained at a $1 peg through smart-contract-based risk controls.

• On-Chain DEX Development: Built a fully on-chain Decentralized Exchange (DEX) featuring an on-chain orderbook; developed the React-based frontend and specialized analytical tools to support the internal trading team's operations;
• Smart Contract Engineering: Co-authored a system of Solidity smart contracts for leverage trading built on top of an open-source decentralized CDP vault protocol, forming the foundation for advanced DeFi product mechanics;
• Data Infrastructure: Co-developed and maintained a custom Ethereum Indexer (ETL) to efficiently process and serve critical on-chain data for both user interfaces and internal analytics.

A crypto analytics and research platform that provides independent data and insights on Ethereum tokens and other digital assets.

• Architected and developed a comprehensive analytics platform providing institutional-grade due diligence on Ethereum tokens for investors;
• Engineered a high-performance blockchain indexer using Python to scan the Ethereum network, identifying new smart contracts and indexing real-time token statistics;
• Built a scalable data pipeline utilizing Google BigQuery to process and store massive datasets of on-chain transactions and token metadata;
• Developed a responsive frontend application in React, visualizing complex financial data and blockchain metrics into an intuitive, user-friendly interface;
• Enabled investors to make informed decisions by aggregating fragmented blockchain data into actionable financial insights.