• Led a development team in the creation of the final version of the PLEXUS (cross-chain DEX aggregator), including features such as multi-token cross-chain swap and multi-chain vaults.

• Generated approximately $6 billion in transaction volume and acquired over 100,000 verified users through the cross-chain DEX aggregator.

• Transitioned to a modular monolithic architecture based on Nest.js, implemented blockchain node redundancy, and optimized infrastructure architecture, resulting in a 60% reduction in customer support incidents, over a 40% decrease in monthly fixed costs, and improved user experience.

• Led a team of 3 frontend and backend developers to develop a decentralized exchange (DEX), NFT membership service, and the alpha version of the PLEXUS (cross-chain DEX aggregator).

• Led the design and implementation of the entire backend architecture and database modeling, and managed the development of both frontend and backend.

• Generated approximately $800 million in transaction volume, acquired around 40,000 verified users, and ranked 13th among all blockchain services, according to DappRadar.

• Optimized AWS infrastructure by restructuring for improved security and scalability, implementing various solutions including migrating from RDS to Aurora and EC2 to Fargate, enabling more efficient and stable operations with a smaller team, and reducing costs by over 40%.

• Transitioned from an Express.js-based monolithic architecture to a Nest.js-based modular monolithic architecture using the Strangler Fig Pattern, separating modules like transaction history tracking, blockchain event indexing, and vaults to minimize error propagation and improve system reliability.

• Modified the backend and database to support node provider redundancy and enable fallback node configuration, preventing issues from managed blockchain node providers from affecting our service and avoiding dependency on a single provider.

• Improved user experience by enhancing frontend and backend with WebSocket integration for faster transaction updates, and implementing various Lottie animations and transition effects for a more engaging interface.

• Developed the world’s first multi-token cross-chain swap feature, enabling the exchange of up to six tokens simultaneously across different blockchains.

• Enhanced database schemas and backend architecture to achieve greater scalability and flexibility.

• Developed a server for transaction status tracking and blockchain event indexing, enhancing the overall trading experience using Nest.js.

• Developed a cross-chain DEX aggregator enabling token exchanges between different chains with optimal exchange rates and times.

• Led the full stack development, including frontend, backend, and AWS infrastructure, using Next.js and Express.js.

• Developed the world's first routing engine to explore cross-chain transaction paths and execute swap operation in a single transaction.

• Improved and stabilized the token swap path discovery algorithm, achieving a 50%+ reduction in speed and error occurrence.

• Integrated over 25 dex aggregator and bridge services, including 1inch and Stargate.

• Developed an NFT platform enabling users to create personalized avatars by customizing characters with various NFT parts for governance.

• Led the full-stack development, including both frontend and backend using React and Express.js, and integrated unity with smart contracts.

• Led both frontend and backend development using React and Express.js and integrated methods of smart contract.

• Developed key features such as swap, staking, dashboard, and pair deposit/withdrawal.

• Enhanced frontend performance, achieving a 70% reduction in smart contract call time.

• Led a team of 3 members in developing a university graduation project, handling project management, application design and development, and implementing a Retrieval-Augmented Generation (RAG) architecture.

• Developed an application using React Native for tracking workout records and providing personalized recommendations and integrated a Next.js project using WebView.

• Implemented a Retrieval-Augmented Generation (RAG) architecture to generate tailored workout plans by leveraging expert knowledge.

• Independently developed a react web application for visualizing subway lines, utilizing EmotionJS for styling and Recoil for state management.

• Implemented features to add, modify, and remove subway lines, stations, and routes, set travel times between stations, and calculate the shortest path between stations.

• The project demo can be accessed through the following link: Train Map Visualizer Demo.

• Developed an information scraping and sharing platform, winning 1st place in a high school web application contest.

• Developed the backend using Java Servlet, Naver's Search Open API, and Kakao's Social Login and Post Upload Open APIs, and built the frontend using JSP, Ajax, and jQuery.

Rehoboth Launch Cup

Smarteen App+ Challenge

• Created a course on developing and deploying a personal tech blog using Gatsby v3.

• The course has been taken by over 3,300 online learners.

• Created a comprehensive React course covering essential React syntax to Redux, featuring two hands-on projects.

• The course has been taken by approximately 1,200 online learners.

Conducted a frontend development fundamentals course using React for a group of 15 club members.