# Paul Simroth

> Portfolio, blog, and projects of Paul Simroth — a full-stack and blockchain developer based in Austria, specializing in Solidity, Next.js, TypeScript, and Web3.

Paul Simroth is a self-taught software developer who transitioned from a decade in aviation operations into full-stack and blockchain development. He holds a BA in History from the University of Vienna. His work focuses on smart contracts (Solidity, Hardhat, Foundry) and full-stack web applications (Next.js, React, TypeScript, PostgreSQL). He writes deeply technical content and publishes practical projects on emerging technologies.

Last updated: 2026-06-18
Contact: mail@simroth.at
Preferred citation: "Paul Simroth — https://www.paulsimroth.at"

## Core pages

- [Home](https://www.paulsimroth.at/): Portfolio landing page with overview of skills, projects, and recent posts.
- [About](https://www.paulsimroth.at/about): Background, technical stack, and approach to building.
- [Projects](https://www.paulsimroth.at/projects): Full list of blockchain and full-stack projects with GitHub repos and live demos.
- [Blog](https://www.paulsimroth.at/blog): Technical writing on blockchain, Web3, and software development.
- [Certificates](https://www.paulsimroth.at/certificates): Formal training and credentials.
- [Tools & Resources](https://www.paulsimroth.at/resources): Curated development tools used in daily work.

## Blockchain resources

- [Blockchain Data Insights](https://www.paulsimroth.at/blockchain): On-chain data, transaction patterns, and blockchain insights.
- [Ethereum Unit Converter](https://www.paulsimroth.at/blockchain/unit-converter): Convert between Wei, Gwei, and Ether.
- [Blockchain KPIs](https://www.paulsimroth.at/blockchain/blockchain-kpis): Key performance indicators for blockchain projects.

## Skills

- **Solidity**: Solidity is one of my core skills. My experience includes developing token contracts (ERC20, ERC721, ERC1155), implementing business logic in smart contracts, and ensuring high performance through gas-efficient coding techniques. (Smart Contracts, Blockchain Dev, Ethereum, ERC20, ERC721, ERC1155, Web3, Crypto Knight, DAO Example, Web3 Market, ETH Domain Website, Real Estate Contract, Ethereum Game, Metaverse, Ethereum DEX, Multi Signature Wallet)
- **TypeScript**: TypeScript enhances my development process by improving code maintainability, safety, and scalability. I use it for building secure DApp frontends, integrating blockchain APIs, and writing automated tests for smart contracts. (Frontend Development, Smart Contract Testing, Web3 Integration, API Development, AI Chat, DAO Example, Portfolio Website, Smart Contract Testing, Next.Js, Frontend Development)
- **JavaScript**: With JavaScript, I build responsive and interactive Web3 applications. My expertise includes frontend development, blockchain integrations, and working with libraries like ethers.js and web3.js to connect smart contracts with user interfaces. (Frontend Development, DApps, Web3 Integration, Blockchain Dev, Web3 Market, ETH Domain Website, Metaverse Landing Page, Ethereum Game, ReactJs Coin Exchange, DEX Frontend, Ethereum DEX)
- **SQL**: I have experience designing and managing relational databases using SQL. My skills include optimizing queries, structuring data models, and ensuring efficient data retrieval for various applications, including Web3 analytics and off-chain data storage. (Database Management, Query Optimization, Data Modeling, Relational Databases, Prisma ORM, Drizzle ORM, PostgreSQL)
- **Next.Js**: Next.js enables me to develop high-performance, SEO-optimized applications with server-side rendering and static site generation. I use it to build scalable DApps with efficient state management and Web3 integrations. (Frontend Development, Server-Side Rendering, Static Site Generation, API Routes, Crypto Knight, Metaverse Landing Page, AI Chat, Portfolio Website)
- **React**: React is my framework of choice for developing dynamic and modular DApps. I utilize its component-based architecture, hooks, and state management libraries to build seamless user experiences for blockchain applications. (Frontend Development, Component-Based Architecture, State Management, Hooks, Web3 Market, ETH Domain Website, ReactJs Coin Exchange)
- **HardHat**: Hardhat is an essential tool in my development workflow for developing, testing, and deploying smart contracts. I utilize it to streamline Ethereum-based development while ensuring security and efficiency. (Smart Contract Development, Testing, Deployment, Ethereum, EVM, Ethereum, Development, Web3 DApps, Smart Contract Development, Smart Contract Testing, Blockchain)
- **Foundry**: Foundry has become my preferred tool for smart contract development. I use it extensively for development, testing, deployments. (Smart Contract Development, Testing, Deployment, Automation, EVM, Research, Ethereum, Development, Web3 Usecases, Blockchain for Enterprise, Smart Contract Testing, Smart Contract Auditing)

## Projects

- [Multi Signature Wallet](https://github.com/paulsimroth/Ethereum101-course-project): A multi signature wallet smart contract. Moving funds requires approval from a majority of addresses holding the Admin role before a transaction can execute, which removes any single point of failure for fund movement. Tech: Solidity, DeFi, Smart Contracts, Ethereum, Blockchain.
- [ETH DEX](https://github.com/paulsimroth/eth201project): An on-chain decentralized exchange supporting market orders and limit orders against an ERC20 trading pair. Tech: Solidity, ERC20, DeFi, Truffle, Smart Contracts, Ethereum, Blockchain.
- [Ethereum Game](https://github.com/paulsimroth/eth_game): A browser game built on Phaser where in-game coins are ERC20 tokens and booster items are ERC1155 tokens. Players cash out collected coins to their wallet at the end of a run. Tech: Ethereum, Solidity, DApps, ERC20, ERC1155, Game Development, EthersJs, Phaser.
- [ETH Domain Website](https://github.com/paulsimroth/eth_domains): An on-chain domain registrar in the spirit of ENS. A Solidity contract handles registration and ownership and a React frontend lets users look up a domain, see its owner or purchase an available one. Tech: Web3, ReactJs, Smart Contracts, DApps, Hardhat, Solidity, EthersJs.
- [Real Estate Contract](https://github.com/paulsimroth/realestate_escrow): A real estate escrow smart contract covering the core roles in a property transaction: buyer, seller, lender and inspector, each with their own permissions and required sign-offs. Tech: Web3, Smart Contracts, Hardhat, Solidity.
- [AI Chat](https://github.com/paulsimroth/ai_chat): A full-stack chat application built with Next.js and TypeScript. It uses the OpenAI API for completions and Firebase for authentication and chat history, with the user able to switch between models. Tech: AI, TypeScript, NextJs, Firebase, ChatGPT, Tailwindcss, OpenAI.
- [Web3 Online Shop](https://github.com/paulsimroth/web3market): An on-chain marketplace where listed items are purchased directly through a smart contract. A React frontend handles browsing and the buy flow against the contract. Tech: Web3, ReactJs, Smart Contracts, DApps, Hardhat, Solidity, EthersJs.
- [Automated Market Maker](https://github.com/paulsimroth/amm): An automated market maker that prices and executes token swaps from a liquidity pool, adjusting reserves on every trade. Tech: Solidity, TypeScript, HardHat, Smart Contracts, Web3, DeFi.
- [DAO Example](https://github.com/paulsimroth/dao_example): A governance system where votes are cast with an ERC20 token. Proposals run through a Governance contract that is owned by a TimeLock, so passed proposals execute only after an enforced delay. Tech: Solidity, TypeScript, HardHat, Smart Contracts, ERC20, Web3.
- [Restaurant Management System](https://github.com/paulsimroth/restaurant_full_system): An all-in-one system for a restaurant: a public website plus a password-protected admin dashboard. tRPC handles API communication and Prisma connects to a MongoDB Atlas database. Tech: Next.js, TypeScript, Full-Stack App, MongoDB, Prisma, tRPC.
- ['Fund Me' Smart Contract](https://github.com/paulsimroth/foundry-fund-me): A donation contract that enforces a minimum contribution of 5 USD. It uses Chainlink price feeds to convert the live ETH price to USD and reject anything under the threshold. Tech: Ethereum, Smart Contracts, Foundry, Solidity, Chainlink, Web3.
- [Lottery Smart Contract](https://github.com/paulsimroth/foundry-lottery): A provably random on-chain lottery built with Foundry. Players buy tickets and after a fixed period a winner is drawn and receives the pooled fees. Tech: Ethereum, Smart Contracts, Foundry, Solidity, Chainlink, Chainlink VRF, Chainlink Automation, Web3, Blockchain.
- [DeFi Protocol Contracts](https://github.com/paulsimroth/foundry-defi-protocol): An over-collateralized stablecoin protocol. Users deposit WETH or WBTC and mint a USD-pegged token, with a stabilization mechanism keeping one token equal to one USD. Tech: Ethereum, Smart Contracts, Foundry, Fuzz Testing, Solidity, Chainlink, Chainlink VRF, Web3, Blockchain.
- [DAO Smart Contracts](https://github.com/paulsimroth/foundry-dao): A decentralized governance system: a voting-rights token, a governor contract that executes passed proposals and a timelock controller enforcing a delay between approval and execution. Built on OpenZeppelin governance modules. Tech: Ethereum, Smart Contracts, Foundry, Solidity, Web3, Blockchain.
- [Crypto Knight Game](https://gamez.paulsimroth.at/): A Web3 Phaser game where players earn ERC20 token rewards by playing. This is a full rebuild of an earlier game of mine, with a rebuilt Next.js frontend and expanded smart contract functionality. Tech: Ethereum, Smart Contracts, Next.Js, Solidity, Phaser, Web3, Blockchain, Blockchain Gaming, ERC20, ERC1155.

## Certificates

- [Crypto for Beginners](https://academy.moralis.io/): Moralis Academy, 2021-08-03. Skills: Bitcoin Basics, Trading Bitcoin, Leverage Tarding, Buying Bitcoin, Altcoin Basics, Trading Platforms, Storing Bitcoin, Trading Altcoins, Identifiying Scams.
- [Blockchain & Bitcoin 101](https://academy.moralis.io/): Moralis Academy, 2021-08-10. Skills: Blockchain Basics, Bitcoin Basics, Consensus Algorithms, Bitcoin Mining, UTXO Model, Segwit, Forks, Cryptography.
- [Ethereum 101](https://academy.moralis.io/): Moralis Academy, 2021-08-16. Skills: Ethereum Basics, Ethereum EVM, Ethereum Consensus, Account Model, Token Standards, Smart Contracts, Decentralized Applications (DApps).
- [JavaScipt Programming for Blockchain Developers](https://academy.moralis.io/): Moralis Academy, 2021-10-15. Skills: Progarmming Mindest, JavaScript Basics, Web Development, JavaScript Types, JavaScript Loops, JavaScript Data Structures, JavaScript Functions, NodeJs Basics.
- [Ethereum Smart Contract Programming 101](https://academy.moralis.io/): Moralis Academy, 2021-11-08. Skills: Solidity Basics, Arrays & Structs, Mappings, Data Location, Error Handling, Inheritance, Visibility, Events, External Calls.
- [FinTech 101](https://academy.moralis.io/): Moralis Academy, 2021-11-17. Skills: Fintech Evolution, Six Pillars of Finance, Computing in Banks, KYC, KYT, KYD, Open Banking, Embedded Finance, Fintech Regulations, Banking API Aggregators.
- [Ethereum Smart Contract Programming 201](https://academy.moralis.io/): Moralis Academy, 2022-02-09. Skills: Truffle Development, Truffle Unit Tests, MetaMask Integration, Truffle Migrations, Ethereum Oracles, Testnet Development, Ethereum DApps.
- [Ethereum Smart Contract Security](https://academy.moralis.io/): Moralis Academy, 2022-04-14. Skills: DAO Hack Replication, Parity Hack Replication, Hyperinfaltion Bug, Developer Mindset, Solidity Best Practices, Contract Desing, Upgradeable Contracts, Proxy Contracts, Pausable Contracts.
- [Chainlink Programming 101](https://academy.moralis.io/): Moralis Academy, 2022-03-29. Skills: Oracles, Smart Contract Programming, Chainlink Node, Oracle Testing, Verifiable Randomness.
- [React Web Development 101](https://academy.moralis.io/): Moralis Academy, 2022-06-14. Skills: Creating React Apps, API Communication, Development Environment for React, Advanced Functional Components, Class-Based Components.
- [DeFi 101](https://academy.moralis.io/): Moralis Academy, 2022-07-01. Skills: DApps, Decentralized Money Market, MetaMask, DEXs, DeFi Risk Analysis, DeFi Financial Stack, Stablecoins, DeFi Account Security.
- [DeFi 201](https://academy.moralis.io/): Moralis Academy, 2022-07-15. Skills: Black Thursday Analysis, Centrifuge, Flash Loans, Yield Hacking, DeFi Interest Rate Swap, DeFi Financial Stack, Stablecoins, Decentralized Insurance.
- [Blockchain Business Masterclass](https://academy.moralis.io/): Moralis Academy, 2022-08-24. Skills: Industry Use Cases, Centralized Systems, Decentralized Systems, Hyperledger Fabric, Hyperledger Composer, Blockchain Tree, Permissioned Blockchains.
- [Ethereum Game Programming](https://academy.moralis.io/): Moralis Academy, 2022-11-24. Skills: Building Game with JavaSscript, Computer Graphics, Business Use Cases, Non Fungible Tokens, Collectibles, ERC721, ECR1155, Integration of Smart Contract and Game, Smart Contract Programming.
- [Baseline Protocol & Unibright](https://academy.moralis.io/): Moralis Academy, 2022-11-29. Skills: Unibright Framework, Corda & Quorum, Enterprise Blockchain, Baseline Protocol, Zero-Knowledge Proof, Hyperledger, Baseline & DeFi.
- [SCRUM](https://goodhabitz.com/): Goodhabitz, 2023-05-24. Skills: Scrum Framework, 3 Pillars of Scrum, Sprint Planning, Product Backlog Management, Sprint Burndown Charts, Sprint Reviews, Agile Principles, Agile Development.
- [Unity Blockchain Game Development 101](https://academy.moralis.io/): Moralis Academy, 2023-12-03. Skills: Unity Basics, Unity Tilemaps & Stripes, Unity Prefabs, Unity in-game items, Unity Collisions, Unity C# Scripting, Unity Gravity.

## Blog posts

- [Is Web3 Still A Thing](https://www.paulsimroth.at/blog/is-web3-still-a-thing)
- [Blockchain Trends 2026](https://www.paulsimroth.at/blog/blockchain-trends-2026)
- [Utilizing Ethereum Domain Services For Your Brand](https://www.paulsimroth.at/blog/utilizing-ethereum-domain-services-for-your-brand)
- [Blockchain In Enterprise](https://www.paulsimroth.at/blog/blockchain-in-enterprise)
- [What Is Web3 Gaming](https://www.paulsimroth.at/blog/what-is-web3-gaming)
- [Understanding Ethereum A Primer On The Whitepaper](https://www.paulsimroth.at/blog/understanding-ethereum-a-primer-on-the-whitepaper)
- [Core Pillars Of Web3](https://www.paulsimroth.at/blog/core-pillars-of-web3)
- [Kpis On The Blockchain In Depth Guide](https://www.paulsimroth.at/blog/kpis-on-the-blockchain-in-depth-guide)
- [Blockchain Trends 2025 Retrospective](https://www.paulsimroth.at/blog/blockchain-trends-2025-retrospective)
- [Trends In Blockchain 2024](https://www.paulsimroth.at/blog/trends-in-blockchain-2024)
- [Blockchain Tech Trends 2025 And Beyond](https://www.paulsimroth.at/blog/blockchain-tech-trends-2025-and-beyond)
- [Blockchain And Web3 In Banking](https://www.paulsimroth.at/blog/blockchain-and-web3-in-banking)
- [Blockchain Use Cases](https://www.paulsimroth.at/blog/blockchain-use-cases)
- [Blockchain And Web3 In Aviation 2026](https://www.paulsimroth.at/blog/blockchain-and-web3-in-aviation-2026)
- [Blockchain And Web3 In Aviation](https://www.paulsimroth.at/blog/blockchain-and-web3-in-aviation)
- [Understanding Mica](https://www.paulsimroth.at/blog/understanding-mica)
- [How To Install Foundry On Windows](https://www.paulsimroth.at/blog/how-to-install-foundry-on-windows)
- [Why Should You Care About Web3](https://www.paulsimroth.at/blog/why-should-you-care-about-web3)
- [Introduction Account Abstraction](https://www.paulsimroth.at/blog/introduction-account-abstraction)
- [What Is The Verifiable Web](https://www.paulsimroth.at/blog/what-is-the-verifiable-web)
- [What Is Real World Asset Tokenization](https://www.paulsimroth.at/blog/what-is-real-world-asset-tokenization)
- [Projects Defi Protocol With Stablecoin](https://www.paulsimroth.at/blog/projects-defi-protocol-with-stablecoin)
- [Projects Foundry Lottery](https://www.paulsimroth.at/blog/projects-foundry-lottery)
- [Projects Foundry Fund Me](https://www.paulsimroth.at/blog/projects-foundry-fund-me)
- [Projects Automated Market Maker](https://www.paulsimroth.at/blog/projects-automated-market-maker)
- [Projects Real Estate Escrow](https://www.paulsimroth.at/blog/projects-real-estate-escrow)
- [Projects Ethereum Domain Registrar](https://www.paulsimroth.at/blog/projects-ethereum-domain-registrar)
- [Projects Web3 Gaming](https://www.paulsimroth.at/blog/projects-web3-gaming)
- [Projects Decentralized Exchange](https://www.paulsimroth.at/blog/projects-decentralized-exchange)
- [Projects Multisignature Wallet](https://www.paulsimroth.at/blog/projects-multisignature-wallet)
- [My Journey To Becoming A Web3 Developer](https://www.paulsimroth.at/blog/my-journey-to-becoming-a-web3-developer)
- [What Is Web3](https://www.paulsimroth.at/blog/what-is-web3)