• I'm a Senior Backend Engineer with 10 years of experience in building scalable backend systems, API integrations, and cloud infrastructure.
• I’m open to exciting opportunities worldwide and currently hold an Open Work Permit for Canada.
• Passionate about distributed systems, AI-powered applications, and cloud-native architectures.

• Languages: Java/Kotlin, Python, C/C++, ARM Assembly
• Backend: Spring Boot, Spring Batch, FastAPI
• Databases: MySQL, MongoDB
• Cloud & DevOps: AWS, Terraform
• Messaging: Kafka
• CI/CD: GitHub Actions, Jenkins, CircleCI
• AI: OpenAI API

• Transforming Teacher Workflow and Student Feedback with Applied AI
• From 8.4% Failure to 95% Growth: Solving a Critical Business Flaw
• $100K to $8M: How Backend Integration Fueled Coupang's Success in Taiwan
• From 'Impossible' to Marketed Feature: The Sony Xperia 1 Project with 'Side Sense' feature

Inspired by how designers practice by redesign the product, I started a System Redesign Series, where I analyze and reimagine the backend architecture of real-world services.

• A Backend Redesign Exercise - Interpark Ticket (like Ticketmaster)
• A Backend Redesign Exercise - Runday (A workout coaching App)
• A Backend Redesign Exercise - MY BOX (A personal cloud storage service, like Dropbox)

I believe that great communities are built when people with shared goals come together to solve common problems. I actively seek out these opportunities, taking the initiative to build platforms and groups that foster connection and growth.

As professionals advance in their careers, finding dedicated study partners becomes a significant challenge. To solve this, I joined as a board member to operate BAKG, a study club for Korean IT professionals.

• What I do: I recruit and onboard new study members, facilitate kick-off meetings, organize offline networking events, and actively participate in studies myself.
• Impact: We've created a valuable hub for motivated professionals to connect, learn together, and grow their networks. This experience has been fundamental in developing my leadership and community management skills.

Working Holiday information is often scattered and outdated. I saw an opportunity to create a centralized platform to address this.

• The Project: I am leading a team of five (2 Frontend, 2 Data, and myself as Backend/Lead) to build Holidap, a platform for sharing the latest Working Holiday information for Canada.
• My Vision: The goal is to grow Holidap into a global community—first for anyone coming to Canada, and eventually for anyone from glob who coming to Canada on a Working Holiday visa.
• What I'm Learning: Leading a multidisciplinary team from concept to launch is teaching me invaluable lessons in project management, team collaboration, and turning a vision into a tangible product.

I love solving real-world problems, no matter how small, by building simple yet effective tools.
Here are some projects where I helped people overcome digital limitations:

• Problem: Pinterest discontinued GIF support, leaving users struggling to manually back up their GIFs.
• Solution: Forked the py3-pinterest repository and created a script to bulk-download GIFs, packaging it as an executable (.exe) for easy use.
• Impact: Reduced backup time from several days to under an hour, helping many users reclaim their content.

• Problem: Many users write long threads on X (formerly Twitter) and wanted a way to back them up.
• Solution: Forked the twitter-archive-parser repository and built a script that automatically extracts and saves full thread content.
• Enhancement: Later evolved this into a backend-free browser tool, leveraging client-side computing to process backups.
• Project Write-up: Read more here (Note: Written in Korean)

You can check my full resume here:
🔗 View Resume

• 💌 E-mail
• 🌐 Blog
• 🔗 LinkedIn
• 🐦 X (Twitter) - Mostly posting in Korean, but feel free to reach out in English!