Sungmin Cho

Frontend Developer

i@sid12g.dev

I'm a junior developer who majored in web programming at Korea Digital Media High School. I’m now pursuing my ongoing interests in development projects along with my studies in Statistics at the University of Seoul.

I have been dedicated to economics and finance as well, as I get to read books and articles regarding these topics and discuss them with colleagues. Lately I've been interested in investment and asset management. Sharing my perspective on those fields with others has let me effectively deepen my thinking.

I frequently utilize Next.js and React Native. My first encounter with web development was in high school, where I learned React through specialized coursework and acquired skills in Next.js and React Native as well. Beyond just frontend fields, I'm pursuing my passion for development and IT as a whole, including backend frameworks like Nest.js and Spring Boot.

Since high school, I've worked on multiple projects and built up my collaboration skills. I've handled not just development but also planning, design, and other aspects of building products, which has provided a more mature perspective when looking at a product as a whole.

When it comes to fields of design, I'm especially interested in UI/UX design with Figma. As I believe that developers should be able to understand and execute their own design for good UX, I've been learning Figma myself since high school, and I’m continuing to expand my viewpoint by taking web design courses in university. One of my significant experiences here was making a book using Figma back in high school. (Learn more)

Right now, majoring in Statistics, I'm studying it while constantly wondering how my development work could evolve when combined with it. Building new products based on what I learn is what drives me.

Work Experience

Fingoo

Frontend Developer

May 2026 - now

  • Joined as a frontend developer on a live investment education & AI-analysis app
  • Used Nativewind for styling and Zustand for state management
  • Adopted Tanstack Query for server state caching and Jest for testing

University of Seoul BIGDATAHUB UNIVERSITY

Supporter

Apr 2026 - now

Education

University of Seoul

Department of Statistics

Mar 2026 - now

Korea Digital Media High School

Department of Web Programming

Mar 2026 - Jan 2026

Skills

Frontend Development

  • React (Advanced)
  • Next.js (Advanced)
  • React Native (Advanced)
  • Nativewind (Intermediate)
  • Zustand (Intermediate)
  • Tanstack Query (Intermediate)
  • Recoil (Intermediate)

Backend Development

  • Nest.js (Intermediate)
  • Spring Boot (Beginner)
  • Prisma (Intermediate)
  • Supabase (Intermediate)
  • Firebase (Intermediate)
  • MongoDB (Intermediate)

DevOps & CI/CD

  • GitHub Workflow (Intermediate)
  • Vercel (Intermediate)

Programming Languages

  • JavaScript (Advanced)
  • TypeScript (Advanced)
  • Python (Intermediate)
  • Swift (Beginner)

UI/UX & Design

  • Figma (Intermediate)
  • Web Design (Beginner)

Open Source

toss/suspensive

  • docs(suspensive.org): add punctuation marks to a document #1168

Aug 2024 - Aug 2024

toss/suspensive

  • docs(suspensive.org): modify punctuation marks and spaces in the document #1179

Aug 2024 - Aug 2024

shuding/nextra

  • docs: fix meta tag theme color #3214

Sep 2024 - Sep 2024

Projects

FINGOO

Frontend Developer

  • Joined as a frontend developer on a live investment education & AI-analysis app
  • Used Nativewind for styling and Zustand for state management
  • Adopted Tanstack Query for server-state caching and Jest for testing
  • 프로젝트 링크

UOS Big Data Quiz

  • Built and shipped a quiz app in a short timeframe for a university festival booth (350+ users)
  • Handled real-world edge cases (e.g., international student ID formats) on site during the event
  • Tracked usage via Google Analytics; deployed with Vercel
  • 프로젝트 링크

RECON

  • Designed and built a full stack browser extension detecting phishing sites in real time
  • Built Nest.js/Prisma backend connecting the extension, detection model, and admin dashboard
  • Led team planning and development for a national anti-phishing competition (DACON)
  • 프로젝트 링크

Next Image Blur

  • Built and published an npm library auto generating blur placeholders for Next.js Image
  • Set up CI/CD with GitHub Workflow for automated npm publishing
  • First experience publishing and maintaining an open source package
  • 프로젝트 링크

Bamboo Master

  • Built a classic arcade game from scratch and trained a neural-network agent to play it
  • Implemented a genetic algorithm to evolve agent genes across generations
  • Independent research project inspired by The Selfish Gene, combining game dev with ML concepts
  • 프로젝트 링크

Pickle

  • Planned and built a mobile social network for students of the same high school to connect
  • Designed system architecture across mobile app (React Native), admin web (Next.js), and server (Nest.js/MongoDB)
  • Delivered full frontend; scoped product roadmap and operations plan
  • 프로젝트 링크

DIMIGO Meal For Watch

  • Independently learned Swift/SwiftUI to build a native Apple Watch app for school meal lookup
  • Integrated a third-party REST API and parsed/rendered JSON responses natively
  • Self-directed project to gain native iOS development experience alongside React Native work
  • 프로젝트 링크

Grops.

  • Built a personal-goal-tracking mobile app to strengthen React Native skills
  • Designed multi-screen UX (feed, explore, profile, saved) with Recoil for state management
  • Self-initiated side project developed independently outside class hours
  • 프로젝트 링크

advocate

  • Co-planned and built a full-stack platform helping teachers create individualized education programs (IEPs)
  • Fine-tuned a GPT model on real-world case data to generate student-specific curriculum
  • Ran the project over 6+ months with weekly team meetings and interviews with real special education teachers to validate feature needs
  • 프로젝트 링크

incheck

  • Built a location-based attendance/headcount tracking app for a school-wide IT competition
  • Used Firebase for real-time location data; explored native features beyond Expo defaults
  • Delivered within a 10-day deadline and presented to the entire student body
  • 프로젝트 링크

EYESAM

  • Built an IoT hardware + mobile app system monitoring eye-health risk factors in real time
  • Integrated Raspberry Pi sensors (distance, light, sound, temp/humidity) with a Firebase backend
  • Debugged hardware/OS-level issues (camera, driver compatibility) under a tight deadline
  • 프로젝트 링크

Certifications

Craftsman Programming

Human Resources Development Service of Korea

Apr 2026

Linux Master Level 2

Korea Association for AI & ICT Promotion

Oct 2023

Contacts

Website

sid12g.dev/en

Website

blog.sid12g.dev

Email

i@sid12g.dev

GitHub

@SID12g