Node Js Full-Stack Developer

Villy Fisker Senior Blockchain Engineer

*****.*****@*****.*** Esbjerg, Denmark

Profile

Innovative and passionate Senior Blockchain Engineer with +7 years of experience in designing, developing and testing various kinds of blockchain projects and technologies. Participated in developing smart contracts, web3 frontend and backend of several aspects of blockchain world such as Defi, NFT marketplaces, Web3 games, DAO, Wallets. Designed and Implemented the infrastructure components of Rollups, Cross-Chain Solutions and Decentralized Identity. Skills

Blockchain Knowledges

Bitcoin, Ethereum, Solana, Cosmos Ecosystem,

Polkadot, Polygon, Arbitrum, Optimism, Zircuit,

Zetachain, PBFT, Tendermint, PoW, PoS, PoA,

PoH, Cryptography, Zero-Knowledge Proofs

Languages

Solidity, Rust, Go, JavaScript, TypeScript, PHP,

Python,

Frontend Technologies

React.js, Vue.js, Next.js, Redux, Material UI,

Tailwind CSS

Databases

MySQL, MongoDB, SQLite, PostgreSQL

Blockchain Frameworks and Standards

Hardhat, Truffle, Foundry, Terraform,

OpenZeppelin, Ethers.js, Web3.js, Cosmos

SDK, CosmWasm, Anchor, Substrate, Biconomy

SDK, ERC20, ERC721, ERC1155, ERC777,

ERC4337, ERC-4626. EIPs,

Testing Tools

Slither, MythX, wasmd, Cypress, Jest, Mocha,

Chai

Backend Technologies

Node.js, Express.js, Django, Laravel, GraphQL

DevOps

Docker, Kubernetes, AWS, GCP

Professional Experience

Senior Blockchain Engineer, Lit Protocol 09/2022 – 01/2025

•Participated in developing SSI wallet and Issuer Node for Decentralized Identity by leveraging Privado ID SDK and threshold cryptography.

•Designed and implemented smart contract wallet, bundler and paymaster component of an account abstraction platform based on ERC-4337 by using Solidity, Go and TypeScript.

•Applied Omni-Chain Smart Contract mechanism of Zetachain to cross-chain asset transfer and message passing providing advanced interoperability of blockchain ecosystem.

•Participated in the design and development of custom modules of crypto economic system using Cosmos SDK(Golang).

•Developed multi-chain web3 gaming platform by integrating web3 frontend, backend side and smart contract side using Typescript, Node.js, Solidity languages and ERC20, ERC721 tokens..

•Leveraged Multi-Party Computation(MPC) technology for signing cross-chain transactions and user operations.

•Developed bridge contracts of Cross-Chain NFT marketplaces with Solidity.

•Implemented containerized environments using Docker and Kubernetes for blockchain nodes, enhancing network reliability and scalability.

Senior Blockchain Developer, Juno Network 01/2021 – 07/2022

•Contributed to the development of a hybrid rollup sequencer by combining zk-proof generation and instant submitting for enhanced security and scalability with Rust.

•Developed and deployed CosmWasm smart contracts on Juno Network, optimizing gas efficiency and ensuring secure cross-chain interactions.

•Implemented governance mechanisms and DAO frameworks enabling decentralized decision- making and community participation.

•Optimized validator node operations and DevOps pipelines improving uptime and network reliability.

Blockchain and Web3 Full-Stack Developer,

Inverse Finance

11/2018 – 12/2020

•Developed and deployed secure smart contracts for DeFi lending, borrowing, and yield farming protocols using Solidity and Rust.

•Implemented advanced tokenomics and staking mechanisms for governance tokens, enhancing liquidity and incentivizing participation.

•Designed a robust oracle architecture using Chainlink to ensure reliable price feeds for DeFi lending and synthetic assets.

•Automated contract deployment and monitoring workflows using Hardhat, Foundry, and Terraform for seamless protocol upgrades.

•Developed front-end applications integrated with Inverse Finance’s smart contract architecture by using Typescript, Ethers.js and Web3.js.

•Participated in developing smart contracts for DEX, trading bots using Solidity on Ethereum.

•Integrated and Tested web3 frontends and smart contracts of NFT auction platform by using Hardhat, Cypress and Jest.

•Conducted security audits and optimized smart contracts for gas efficiency, reducing transaction costs for users across the protocol.

Full-Stack Developer, Intellectsoft 05/2017 – 10/2018

•Developed responsive and user-friendly web applications using React, Next.js, and TypeScript.

•Developed Single Page Applications (SPAs) with optimized state management using Redux and Vuex.

•Created reusable UI components with Tailwind CSS, Material UI for consistent design systems.

•Built scalable RESTful and GraphQL APIs using Node.js, Express, and NestJS.

•Implemented server-side rendering (SSR) and static site generation (SSG) using Next.js and Nuxt.js.

•Designed and optimized database schemas using PostgreSQL, MySQL, and MongoDB.

•Developed and deployed full-stack applications using Docker, Kubernetes, and AWS. Education

Bachelor's Degree, Aalborg University 04/2014 – 03/2017

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