Insu Lee
Header
Name: Insu Lee
Position: Blockchain & Backend
Developer
Email:-Github:
https://github.com/in63119
(https://github.com/in63119)
Blog: https://www.in-labs.xyz/
(https://www.in-labs.xyz/)
Summary
Hello, my name is InSu Lee, and I am a blockchain & backend developer with
4 years of combined experience:
2 years in professional blockchain/backend development
2 years in teaching programming and blockchain as an in-person
instructor
My main areas of expertise are developing smart contracts using Solidity and
building EVM-based platforms, as well as developing backend services with
an MSA architecture using Nest.js, TypeScript, TypeORM, and PostgreSQL.
I have a strong track record of delivering development/IT courses and
explaining technical concepts to beginners and non-majors in a clear and
accessible way.
Skills
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Blockchain
EVM: Ethereum, Polygon, Kaia, Bifrost (intermediate)
Smart contracts: Solidity, upgradeable/custom proxy patterns, DApp
backend/server integration
Tools: Hardhat, Ethers.js, Web3.js, Truffle
Non-EVM: Solana (beginner – wallet features, NFT minting with Metaplex
Candy Machine; no production launch yet)
Backend
Languages & Frameworks: TypeScript, Node.js, Nest.js, Express
Databases & Messaging: PostgreSQL, TypeORM, SQS, Firebase Cloud
Messaging
Experience: Service backend development, microservice/MSA-style
architecture, queue-based asynchronous processing
Collaboration & Tools
Git, GitHub, Jira, Confluence, Slack, Discord, Asana, Figma
Teaching & Training
In-person instruction: intro/advanced programming, web development,
blockchain fundamentals/advanced
Audience: University students, adult learners, working professionals
Focus: Project-based, hands-on classes; step-by-step explanations tailored
for beginners and non-majors
Experience (Work Experience)
Chainwith – Blockchain & Backend Developer
Jan 2024 – Dec 2024
Developed and operated the wallet backend in an MSA (microservices)
architecture, including app push delivery and gas sponsorship logic.
Designed and implemented an intent system that generates meaningful onchain transactions on the mainnet, handling approximately 288K
transactions per day.
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Built and maintained smart contracts such as:
A vending-machine contract for probabilistic gifticon and token (lotterystyle) rewards.
An NFT contract that airdrops random-type NFTs with different minting
probabilities to new users.
Intent-related contracts that convert community user activities into onchain transactions.
ALock Co., Ltd. – Backend & Blockchain Developer
Jan 2023 – Jan 2024
Maintained and enhanced the company’s wallet app backend, focusing on
deposit and withdrawal flows.
Developed the main page for a gifticon marketplace (“ALock Mall”) and
integrated it with existing wallet services.
Led NFT development and operations for a digital exhibition project,
including building and operating a minting platform.
Teaching Experience
RocketPunch Co., Ltd. – Blockchain Instructor (Full-stack & Smart Contracts)
Dec 2024 – Sep 2025 (10 months)
Led a 6-month, in-person blockchain course as the sole instructor, covering
full-stack DApp and smart contract development.
Designed the full curriculum and developed hands-on coding exercises and
practice materials.
KFTC (Korea Financial Telecommunications & Clearings Institute) – Corporate
Training Instructor
Nov 2023 (3-month offline program, Bundang, Seongnam)
Delivered corporate training on Solidity contract syntax, dApp development,
and web3 SDK usage for financial industry professionals.
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Seoul ICT Innovation – NFT Development Course Instructor
Sep 2023 – Oct 2023
Designed an NFT development course and delivered real-time, in-person
lectures.
Developed an NFT-based attendance tracking website as part of the course
curriculum.
Narrative – Blockchain Bootcamp Instructor & Curriculum Developer
Apr 2021 – Oct 2022
Launched and led a blockchain bootcamp, developing educational content
and serving as a primary instructor.
Created structured learning paths and project-based exercises to help
beginners transition into web3 development.
Projects
in-labs – Personal Technical Blog
https://www.in-labs.xyz/
Designed and developed a personal technical blog focused on blockchain,
backend, and infrastructure topics, exploring low-cost architectures and
on-chain/off-chain data patterns.
KIP-153 Proposal – Klaytn Improvement Proposal
https://github.com/klaytn/kips/pull/154
Proposed KIP-153 to introduce a labeling mechanism for web3 entities
(wallets, contracts, etc.) similar to Klaytn Name Service (KNS), improving
governance and resource management.
Defined fine-grained roles and an approval workflow to manage labeled
resources in a more controlled and auditable way.
Education
CodeStates – Software Engineering Bootcamp (Cohort 25)
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Sep 2020 – Apr 2021
Full-stack software engineering bootcamp with a project-based curriculum.
Academic Credit Bank System (Korea) – B.A. in Public Administration (Major
in Social Welfare)
Feb 2014 – Jun 2016
Major in Social Welfare; focused on child welfare policy analysis.
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