Full-Stack Product Engineer with a frontend focus

I build web and mobile products with React, TypeScript, and Flutter, and extend into Django and Spring Boot when a product problem crosses API, data, admin, or release boundaries.

• Contract / Freelance Developer · 2025–2026 · Approximately 8–9 months in total
• Software Engineer Intern · 2026.07–2026.08

Started as a freelance developer, then joined on-site as an intern; the roles overlapped in 2026.07–2026.08. During the internship, worked on CoTeacher, OU, and SYM; across both engagements, work covered web, mobile, admin, APIs, QA, and releases—including OU payment recovery and operator tooling.

Company source code is non-public; the links below point to live services.

Next.js · React · TypeScript · Django · PostgreSQL

• Product delivery: Implemented and verified content, payment, review-queue, and error-state flows across web, mobile, admin, and APIs.
• Performance & validation: On a 100-course synthetic fixture, reduced catalog query count from 202 to 2 and added regression coverage; verified Django 5.2 LTS compatibility by running the existing 8,210-test backend suite.

React · TypeScript · Spring Boot · PostgreSQL · Expo

• Reliability: Kept domain writes and outbox registration in one transaction, then moved notification delivery to a retryable worker.
• Code review: Identified preview/commit snapshot drift, inconsistent season-to-student lock ordering, and a missing history-endpoint authorization guard; re-reviewed the fixes before approval.

• Filient · SW Maestro 16th Cohort · macOS file automation
  Built Flutter rule, history, and rollback flows; added macOS integration, localization, and product guides.
  Product website · App repository · Web repository
• Bridge · 2026 GDGoC quadS Hackathon, General Track · Parent–child digital usage management
  Built role-specific flows across two Flutter apps and aligned time, mission, and notification contracts with Spring APIs.
  Parent app · Child app · Backend repository

Frontend & mobile

Backend & data

Delivery & quality

• SeoulTech ITM · 2020.03–2027.02 (Expected) · Dual degree with Northumbria University

• SW Maestro · 16th Cohort · 2025.04–2025.12 · Completed
• Promising Student Startup Team 300+ (U300+) · Growth Track · 2026–Present

• Coding Education Assistant Instructor · Samsung Dream Scholarship Foundation-linked program · 2026.05–Present
  Supported coding education for middle and high school students.
• AI Startup Education PBL Instructor · AI School Up, AND Center · 2026.06–2026.08
  Led project-based AI entrepreneurship education.

• App Core & Operations · GDG on Campus in SeoulTech · 2025.09–2026.06
• President · ITM Coding Education Volunteer Club · 2024.03–2024.12

• Own product problems end to end—from user flow and API contract to operator workflow and release verification.
• Match verification to risk through focused tests, type checks, builds, reviewable diffs, and post-deployment checks.

My AI product work includes PersonaWalk v2, a local-first usability automation prototype built with Rust, Tauri, React, and Chromium CDP. I implemented its observation → decision → action → safety → artifact → report pipeline.

I use AI to accelerate repository exploration, implementation drafts, and review. I remain responsible for validating the source of truth, the resulting diff, and the real user outcome.

inspect → isolate → implement → test / type-check / build → review → verify