Xinchen Liu | Web3 Developer & Blockchain Engineer

WORK EXPERIENCE

Led smart contract and SDK development for Horizon Smart Wallet, a production ERC-7579 modular smart account with passkey-based signing across web and mobile.
Integrated open ERC standards across smart wallet architecture, including ERC-7579 modular accounts, ERC-4337-style account abstraction flows, ENS naming, and ERC-7978 ownership design.
Shipped wallet and onchain hub infrastructure across Solidity contracts, TypeScript SDKs, signing flows, WalletConnect integrations, product UX, and third-party app surfaces.
Worked on GUSD and tokenization-adjacent market infrastructure, connecting stablecoin settlement, onchain market access, and regulated product requirements.
Applying wallet, identity, attestation, and settlement architecture to prediction-market and onchain systems with a regulated exchange perspective.
Represented Gemini Wallet as an ETH NYC speaker and hosted a sponsor hackathon on behalf of Gemini Wallet.

Founding engineer at seed-stage crypto payments startup backed by Ethereal, 1kx, Blocktower, and Pillar Ventures.
Built Safe-based payment infrastructure, including automated payout modules, transaction encoding, and deployment tooling for more than 1,000 multisig wallets across 6 chains.
Led frontend/API work for Dustsweeper, a small-balance DEX that has processed 65+ ETH in volume.
Built Patch Wallet SDK/PWA, an early social account-abstraction wallet with 400k+ wallets deployed.

Education platform simplifying college application process
- Secured funding from MIT Launch program
- Developed algorithms for customized college ranking and matching algorithms
- Created user-friendly UI with self-developed JavaScript framework and Python backend

Duke University | Durham, NC

Verify with proof link

ETH Denver 2024 & 2025 | Mentor, 2024, 2025

TechX Academy | Lecturer / Student Academic Lead, Summers 2019-2021

Taught Full-Stack Web Development, covering modern dev stack, history, and working mechanisms
Collaborated with MIT Media Lab professors on human-computer interaction courses
Developed TechX cloud platform with internal communication, version control, and file sharing capabilities

Duke University | Guest Lecturer, Consultant, Tech Consultant at OIT Innovation Co-Lab, 2018-2022

Led programming seminars and office hours for student developers
Guest lectured on Web Development for deploying web applications and FinTech Blockchain for smart contract development; consulted on Data Structure and Software Engineering projects
Managed development of educational tools including chat servers and web-based code editors, and managed ruby-on-rails backend for school services at OIT Co-Lab
Organized coding bootcamps covering Command-Line, React, and Node.js

Viral.games A Prediction Market for Social Media. Bet on what goes viral on X, YouTube, and Farcaster.
- Implemented cron jobs and webhooks for real-time bet processing based on social media interactions
usr.id Off-chain/cross-chain resolver for ENS
- Deployed standalone CCIP server for cross-chain resolution
- Implemented username and domain registration/resolving for multiple projects, including Linea Domains
Degen.game Novel web3 social games for the farcaster ecosystem
- Shipped farcaster client specialized for frames and games with PWA and native support
- Created and launched multiple seasons of frame based games on farcaster, with thousands of active users
Telegram and Discord bot development with autoreply and mini games
Multiple contracting work for clients, Modern Responsive Website with CMS based on JAM stack
Ticketing service and E-Commerce web app with WeChat integration
End-to-end encrypted instant messenger
Private git and personal web drive service on homelab server, deployed on *.lxc.xyz domain

Blockchain Development

Smart contract development and deployment (ERC-4337, multi-chain entry point contracts)
Experienced in Hardhat, Foundry, Viem, web3.js, and ethers.js
ENS, Safe, and CCIP integration
Blockchain transaction encoding/decoding
SDK development for blockchain wallets

Full-Stack Web Development

Integration of blockchain functionality into web applications
Backend: Node.js, Deno, Bun, Ruby on Rails, API aggregation and endpoint development
Frontend: HTML, CSS, JavaScript (ES-Next), React, Next.js, Vue.js, Svelte, Tailwind, Astro
Database: MySQL, MongoDB, PostgreSQL, modern ORMs, supabase, convex

System Administration DevOps

Linux server management, experience with bare metal, cloud (VPS and EC2), and container deployment;
Experienced with serverless and creating CI/CD pipelines, worked with AWS (CDK), Vercel, pipedream and Railway in production environments under stress, had exposure to Azure, Google Cloud, Aliyun, and other cloud providers
Deployment and maintenance of various services including G-Suite, E-Commerce platforms, and private cloud solutions

Additional Skills

Proficient in Figma, Sketch, Adobe XD, Illustrator, Photoshop,
Experience in designing user-friendly interfaces for blockchain applications
Version control (Git), development environment optimization, video editing, hardware repair and customization

Mandarin (fluent), English (fluent), German (Conversational)

Philosophy of Economics, CLI and dev environment optimization, Cultural Exploration and Traveling, Innovative Learning Approaches