Full-Stack Ux Design

Jonas Helson Web* Developer

**********@*****.*** +468******** Stockholm, Sweden

Innovative and results-driven Full-Stack Web3 Developer with 7+ years of expertise in building scalable, secure, and high-performance decentralized applications (dApps) and smart contract systems. Passionate about leveraging blockchain technology to disrupt industries by delivering seamless user experiences, optimizing backend systems, and ensuring decentralized solutions are secure, efficient, and accessible.

Skills

Languages

Solidity, Rust, Go, Javascript, Typescript,

Python, C++

Tools

Infura, The graph, IPFS, Alchemy, Tenderly,

Remix IDE, Anvil

Framework & Library

React.js, Next.js, Vue.js, Angular, Nest.js,

Hardhat, Foundry, Truffle, Openzeppelin

Web3/Blockchain Development

Ethereum, Binance Smart Chain, Solana,

Polkadot, ether.js, web3.js, Optimism, AMM,

Oracle, Defi

Database

MySQL, PostgreSQL, Redis, MongoDB

Others

AWS, GCP, CI/CD, Kubernetes, Docker, Kafka

Professional Experience

Senior Web3 Developer, RedStone Finance

•Developed a cross-trade platform supporting non-liquidity transactions, enabling seamless asset swaps without relying on traditional liquidity pools.

08/2022 – 03/2025

Baar, Switzerland

•Designed and deployed Solidity-based cross-chain bridge contracts, facilitating secure and efficient asset transfers between Layer 1

(Ethereum) and Layer 2 (Optimistic Rollup OP Stack) networks.

•Bypassed the standard 7-day challenge period for Optimistic Rollup withdrawals by implementing a custom cross-chain messenger, enabling instant token exits while maintaining security guarantees.

•Developed our own Chain indexer framework and Optimized data aggregation using PostgreSQL and Redis for fast, decentralized query access.

•Created bridge analytics dashboards, displaying historical transfers, total volume, and network statistics using D3.js and Chart.js.

•Designed and deployed cloud-native applications using AWS services (API Gateway, EC2, Lambda, S3, DynamoDB) to build scalable and resilient backend solutions.

•Managed cloud infrastructure using Terraform and Kubernetes, automating the provisioning of cloud resources and managing containerized applications.

•Conducted smart contract security audits and optimizations, implementing reentrancy protection, Merkle proofs for fraud detection, and slippage control.

Web3 Engineer, Fairmint

•Built on-chain automated market maker (AMM) smart contracts using Rust and Anchor, implementing liquidity pools, constant product market-making, and dynamic fee structures. 03/2020 – 08/2022

San Francisco, US

•Integrated price oracles (Pyth, Switchboard, Chainlink) to fetch real- time asset prices, ensuring accurate trade execution and preventing oracle manipulation attacks.

•Designed and developed an interactive and responsive DEX frontend using Vue.js (Nuxt.js), Tailwind CSS, and Framer Motion, enhancing user engagement and accessibility.

•Worked on microservices architecture, utilizing cloud services such as AWS Lambda and Amazon ECS to ensure scalability and reliability in production environments.

•Conducted smart contract security audits, including reentrancy protection, slippage tolerance limits, and oracle price validation, ensuring protocol resilience.

Web3 Full Stack Developer, Lisk

•Designed and developed a highly interactive staking dApp using React (Next.js), Redux, and Tailwind CSS, ensuring a smooth and visually appealing user experience.

07/2018 – 03/2020

Zug, Switzerland

•Implemented custom UI components for staking dashboards, including real-time APY calculations, reward progress bars, and animated staking/un-staking interactions to enhance user engagement.

•Integrated Web3.js/Ethers.js to enable secure and instant blockchain interactions, allowing users to stake, claim rewards, and withdraw funds effortlessly.

•Ensured smooth transaction confirmations and status updates with real-time blockchain event listeners and toast notifications (React Toastify).

•Conducted A/B testing and user feedback analysis to refine UI elements, enhance accessibility, and optimize conversion rates for staking participation.

Education

Bachelor Degree of Computer Science,

Lund University

09/2014 – 06/2018 Lund, Sweden

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