Fast-Growing Frontend Developer 👋

Started as a blockchain (Solidity) developer and within 3.5 years designed multi-platform architecture for a service with 12,000 DAU, achieved 60% AWS cost reduction (saving $2,400 annually), and led 60% loading speed improvement.

🚀 Key Achievements

📊 Cost Optimization Expertise

• 60% AWS Cost Reduction: CloudFront optimization from $300 → $120/month (saving $2,400 annually)
• 90% CloudFront Request Reduction: 12M → 1M requests/month
• 60% Initial Loading Speed Improvement: 3 seconds → 1.2 seconds

🏗️ Large-Scale Architecture Design

• Zero-Downtime Migration Design: Nuxt SSR → React CSR, led 6-month project (2-person team)
• Monorepo Architecture Implementation: Integrated management of 10 independent services (charging, conversion, laundry, main, point, ticket, etc.)
• Lambda + S3 Page-by-Page Independent Deployment: 0 minutes service downtime

📱 Business Impact

• DAU Growth Contribution: Achieved average 12,000 users (peak 20,000) through laundry service launch
• Cross-Platform Collaboration: Implemented app-web bridge communication, Bluetooth IoT device integration
• Long-Standing Issue Resolution: Complete resolution of Bluetooth communication errors through Sentry implementation + 2 months debugging

💼 Career

Frontend Developer

September 2022 ~ Present (3 years 4 months)

Led technology transformation and optimization while operating 10 independent services at a campus-focused B2C mobile app development company.

Key Responsibilities

• Nuxt.js → React.js Migration Project Lead

  • Migrated 10 core pages (main, charging, conversion, laundry, point, ticket, etc.)
  • Designed Lambda + S3 based progressive deployment strategy
  • 2-person team, 6 months duration, zero-downtime service operation

• Monorepo Architecture Implementation

  • Multi-service integration based on pnpm workspace
  • Common UI library design (packages/ui, packages/styles)
  • Page-by-page independent build/deployment pipeline configuration

• AWS Infrastructure Optimization

  • 60% cost reduction through CloudFront caching strategy
  • S3 file compression and static resource optimization
  • Loading speed improvement from 3 seconds → 1.2 seconds

• Laundry Service Development & Operation

  • Developed washing machine control system integrated with Bluemeter (Bluetooth IoT)
  • Implemented app-web bridge communication
  • Stable operation of service with 12,000 DAU

• Monitoring System Implementation

  • Real-time error tracking through Sentry implementation
  • Complete resolution of long-standing Bluetooth communication issues through 2 months debugging
  • User experience improvement and reduced issue response time

• Development Culture Improvement

  • Proposed and conducted weekly technical sharing sessions
  • Built knowledge sharing system through documentation of recurring cases
  • Improved designer-developer collaboration efficiency through Storybook implementation

Tech Stack

React, TypeScript, Nuxt.js, Vue.js, Motion.js, Sentry, AWS (Lambda, S3, CloudFront), pnpm workspace, Storybook

Blockchain Developer & NFT Projects

June 2022 ~ September 2022 (3 months)

Through experience in Solidity-based smart contract development and NFT minting platform construction, I gained deep understanding of blockchain technology and Web3 ecosystem. Later transitioned to frontend development to deliver value to a broader user base.

Key Projects:

• Delica NFT Minting Platform: Solidity smart contract design and React-based frontend implementation
• Bellygom NFT Project: Ethereum-based NFT issuance system development

Tech Stack: Solidity, Web3.js, Ethereum, React, ethers.js

Transition Reason: After NFT market downturn, pivoted to frontend development to provide substantial value to more users. Blockchain development experience greatly helped with complex state management, asynchronous processing, and security issue handling.

💻 Tech Stack

Frontend

DevOps & Tools

Backend (Experience)

🎯 Strengths

1. Rapid Technology Transition Ability ⚡

Solidity → Vue.js → React → AWS Infrastructure mastered within 3.5 years

• Started with blockchain development but quickly built frontend capabilities
• Quick adaptation to new technology stacks and ready for production deployment
• Differentiated capabilities in wallet integration, blockchain communication through Web3 experience

2. Business Impact-Focused Development

Creating measurable results such as cost reduction, performance improvement, and DAU growth rather than simple feature implementation

3. Architecture Design Experience

Senior-level architecture design experience including monorepo, zero-downtime deployment, and multi-service operation

4. Problem-Solving Ability

Experience in fundamental problem resolution including 2-month long-term debugging and Bluetooth communication issue resolution

📚 Tech Blog

Consistently documenting problems encountered in practice and their resolution processes.

• CloudFront Cache Optimization: Read More
• CloudFront Cost Reduction: Read More
• Cookie Security Complete Guide: Read More
• React Query Usage Guide: Read More

👉 View Full Blog

📬 Contact

• Email: cjftns01@gmail.com
• GitHub: github.com/pocodingwer
• Blog: pocodingwer.github.io
• Instagram: @lim_cuck