Skill Assessments This user has not passed any tests yet Languages English - Intermediate Chinese - Native or Bilingual People also viewed * [![Reyner Paul Lumpinas](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_69942_1783690915.jpg) Reyner Paul Lumpinas Aspiring Frontend Developer](https://jobicy.com/u/id69942.md) * [![Mykhailo Vasyliev](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_70390_1783958117.jpg) Mykhailo Vasyliev Engineering Manager / Lead Mobile Developer](https://jobicy.com/u/id70390.md) * [![Muhammad Talal](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_69836_1783609912.jpg) Muhammad Talal Unity Developer & Gameplay Programmer](https://jobicy.com/u/id69836.md) * [![Alexandre Silva](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/05/avatar_60298_1779685427.jpg) Alexandre Silva Senior Software Engineer](https://jobicy.com/u/id60298.md) * [![Sergi Cosialls](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_70946_1784116832.jpg) Sergi Cosialls AI Solutions Architect | Full-Stack Product Builder](https://jobicy.com/u/id70946.md) * [![Gábor Demeter](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_69961_1783698917.jpg) Gábor Demeter Senior Salesforce Developer / Technical Lead](https://jobicy.com/u/id69961.md) * [![Helder Cavalcante Filho](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_69908_1783650956.jpg) Helder Cavalcante Filho Fullstack Developer](https://jobicy.com/u/id69908.md) * [![Akhmad Ridlo Rifa](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/07/avatar_70256_1783927970.jpg) Akhmad Ridlo Rifa'i Backend Developer](https://jobicy.com/u/id70256.md) [All talent ↗](https://jobicy.com/talent.md) * [Overview](#overview) * [Portfolio](#portfolio) ## About Me I am a blockchain backend engineer with nearly 3 years of Web3 experience building DeFi lending protocols, NFT marketplaces, on-chain data synchronization systems, smart contract event monitoring, and backend microservices. I have hands-on experience with Solidity, Go, Hardhat, Foundry, OpenZeppelin, and major DeFi protocols such as Aave, Uniswap, and Compound V2. I have worked across Ethereum, BSC, Polygon, and Solana ecosystems, delivering smart contracts and off-chain services end to end. My recent work has focused on high-scale Web3 products, including multi-chain lending and NFT trading systems. I have contributed to performance optimization, data consistency, gas reduction, and production-grade monitoring and reliability. Before moving into Web3, I spent more than 10 years in Java backend development and project management, working on payment systems, telecom platforms, enterprise integration, clearing and settlement, and system delivery. This background helps me design robust backend architectures and manage complex delivery processes. I am comfortable working with microservice architectures, databases, caching, messaging systems, and observability tools. I also have experience mentoring junior engineers, writing technical documentation, and coordinating cross-functional delivery. I am now targeting roles such as Web3 Backend Engineer, Blockchain Backend Engineer, Solidity / Smart Contract Engineer, and DeFi / NFT Platform Engineer, where I can combine backend engineering depth with blockchain product delivery. ## Skills ### [Java](https://jobicy.com/talent/java.md)[Risk Management](https://jobicy.com/talent/risk-management.md)[Blockchain](https://jobicy.com/talent/blockchain.md)[MySQL](https://jobicy.com/talent/mysql.md)[Mentoring](https://jobicy.com/talent/mentoring.md)[Go](https://jobicy.com/talent/go.md)[Kafka](https://jobicy.com/talent/kafka.md)[MongoDB](https://jobicy.com/talent/mongodb.md)[Redis](https://jobicy.com/talent/redis.md)[Oracle](https://jobicy.com/talent/oracle.md)[Prometheus](https://jobicy.com/talent/prometheus.md)[Automated Testing](https://jobicy.com/talent/automated-testing.md)[Quality Control](https://jobicy.com/talent/quality-control.md)[SQL Server](https://jobicy.com/talent/sql-server.md)[Ethereum](https://jobicy.com/talent/ethereum.md)[Web Services](https://jobicy.com/talent/web-services.md)[PMP](https://jobicy.com/talent/pmp.md)[Spring](https://jobicy.com/talent/spring.md)[Smart Contracts](https://jobicy.com/talent/smart-contracts.md)[Solidity](https://jobicy.com/talent/solidity.md)[MVC](https://jobicy.com/talent/mvc.md)[ELK](https://jobicy.com/talent/elk.md)[NFT](https://jobicy.com/talent/nft.md)[CDN](https://jobicy.com/talent/cdn.md)[Lending](https://jobicy.com/talent/lending.md)[AJAX](https://jobicy.com/talent/ajax.md)[Bitcoin](https://jobicy.com/talent/bitcoin.md)[JVM](https://jobicy.com/talent/jvm.md)[Dex](https://jobicy.com/talent/dex.md)[Staking](https://jobicy.com/talent/staking.md)[Solana](https://jobicy.com/talent/solana.md)[Hardhat](https://jobicy.com/talent/hardhat.md)[Foundry](https://jobicy.com/talent/foundry.md)[SDK Integration](https://jobicy.com/talent/sdk-integration.md)[IPFS](https://jobicy.com/talent/ipfs.md)[Gin](https://jobicy.com/talent/gin.md)[Uniswap](https://jobicy.com/talent/uniswap.md)[Liquidity Mining](https://jobicy.com/talent/liquidity-mining.md) ## Tech Stack & Tools ### Data Stores [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/mongodb/mongodb-original.svg) MongoDB](https://jobicy.com/talent?tool=mongodb.md) [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/mysql/mysql-original.svg) MySQL](https://jobicy.com/talent?tool=mysql.md) [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/oracle/oracle-original.svg) Oracle Database](https://jobicy.com/talent?tool=oracle.md) ### Development [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/hardhat/hardhat-original.svg) Hardhat](https://jobicy.com/talent?tool=hardhat.md) ### Languages & Frameworks [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/react/react-original.svg) React](https://jobicy.com/talent?tool=react.md) [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/solidity/solidity-original.svg) Solidity](https://jobicy.com/talent?tool=solidity.md) [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/spring/spring-original.svg) Spring Framework](https://jobicy.com/talent?tool=spring.md) [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/xml/xml-original.svg) XML](https://jobicy.com/talent?tool=xml.md) ### Libraries [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/jquery/jquery-original.svg) jQuery](https://jobicy.com/talent?tool=jquery.md) ### Monitoring [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/prometheus/prometheus-original.svg) Prometheus](https://jobicy.com/talent?tool=prometheus.md) ## Experience Web3 Backend Developer @ AllScale Jan 2024 - Present Worked on a multi-chain DeFi lending protocol based on Compound V2 supporting Ethereum, BSC, and Polygon. Contributed to deposits, borrowing, liquidation, liquidity mining, tiered lending, and option-based lending features. Improved high-concurrency processing, optimized gas costs, designed event replay and data repair mechanisms, and mentored junior blockchain engineers. Web3 Backend Developer @ AllScale Mar 2023 - Dec 2023 Built features for a decentralized NFT marketplace including multi-chain NFT minting, trading, auctions, and cross-chain bridging. Implemented ERC721 and ERC1155 contract interfaces, backend microservices, batch minting, order matching, metadata handling, and anti-cheating mechanisms. Java Developer / PM @ Sandpay Network Service Development Co., Ltd. Dec 2017 - Mar 2023 Led development and project management for payment systems, including WeChat Pay and Alipay QR-code integrations, merchant access, bank interfaces, clearing and settlement, accounting, reconciliation, planning, and delivery control. Java Developer / PM @ Hongcheng Computer Systems Co., Ltd. Oct 2010 - Dec 2017 Worked on telecom enterprise systems using MVC architecture, Struts, SpringMVC, Ajax, Oracle, SQL Server, and Web Service integration. Handled feature development, database maintenance, releases, requirements collection, and customer communication. Java Developer @ iSo W Stone, Nanjing Mar 2009 - Oct 2010 Developed Java applications for BPO/IPCC call-center systems onsite with Huawei. Worked with Dojo, jQuery, Struts2, Spring transaction control, and internal data-processing frameworks. ## Education Shanghai Jiao Tong University Oct 2018 - Jun 2023 Bachelor's Degree, Computer Science and Technology Bachelor's degree in Computer Science and Technology. Portfolio not available. Services not available.