Miryang Jung

Frontend Engineer

I've built commerce three times.Frontend engineer building web and mobile applications with React, Next.js, and React Native. Built commerce products at Farmmorning, Fabrill, and Magazine C, covering architecture, payments, back-office tooling, and operations. Increased product listings by 50% through UX improvements and raised recommendation CTR from 5% to 36.8%.I own products from launch through operations.Built and launched Magazine C's store as the sole developer in about two months, then developed settlement, content editing, and translation tools. Worked directly with the business team on requirements, operations, and customer acquisition. Received Grandeclip's outstanding employee recognition for H1 2026.I solve user problems through engineering.Reduced memory usage for large image lists from 2GB to 200MB to resolve app crashes. Built internal knowledge search with traceable sources and AI translation review tools, and supported their practical use through training and mentoring.

Work Experience

Grandeclip

Senior Frontend Engineer · AX Partner | Oct 2024 ~

Magazine C

Brand site and direct-to-consumer store for Magazine C, a documentary magazine about chairs.

·Designed and built the brand site, store, content admin, and database as the sole developer; launched in about two months to establish a direct sales channel for magazines and merchandise (Jun 2026)

·Integrated PortOne/KCP, two local payment wallets, VAT-exempt book sales, and member/guest coupons; established workflows from payment approval through fulfillment and refunds

·Defined requirements and page layouts directly with the business team and coordinated QA and launch without a dedicated product manager or designer

·Designed and built an AI translation and review workspace for the English edition, connecting style-guide and glossary-based translation with review by an external translator

·Automated daily visitor and order reports in Slack and established search acquisition foundations through SEO and shopping-feed integration

·Proposed and ran an influencer campaign with seven creators, recording 212K content views, 1,350 saves, and 533 shares (Jul–Sep 2026 posts, measured in October)

Next.js, TypeScript, Supabase, PortOne, Google Analytics

POUCH-it

[Discontinued] An app for image-based beauty product management and search.

·Improved large-image-list rendering to reduce memory usage by 90% (2GB → 200MB) and resolve app crashes; presented the work at FOSSASIA Summit 2026

·Designed and built a Personalized Skin Report based on user data; reached 20% user adoption in beta and expanded it into an official feature

·Shipped auto-upload and timeline features on schedule for a service pivot, contributing to 134% growth in cumulative downloads and an all-time-high WAU

·Designed and built an LLM-based admin and Slack AI bot (PIM) to let non-engineering teams query business data

·Contributed to influencer interviews and ad production for US market validation; produced creative that recorded $5.98 CPI

·Standardized team development workflows with project rules, reusable skills, and automated hooks for AI coding tools

Expo (React Native), TypeScript, Next.js, Amplitude, Gemini

Pulse — Internal Knowledge Search & Q&A

An internal pilot for finding work context and sources across meeting notes and Slack.

·Developed and deployed a Q&A pilot connecting Drive meeting notes and Slack ingestion to retrieval, answer generation, and source display

·Combined keyword, semantic, and temporal search with direct Slack search; added candidate reranking and source validation to make answer evidence traceable

·Implemented authentication, pilot access controls, job deadlines, and webhook signature verification; documented deployment, incident response, and access management

Python, Supabase, Paperclip

AX Program Design & Operation

·Built and released GrandePPT 2.0, a branded slide-generation plugin for non-engineering teams, and initiated AI training, mentoring, and demo programs to support adoption

·Led planning, speaker recruitment, sponsorships, and delivery for two public AX meetups with 310 and 367 registrations

·Designed matching, team support, and retrospectives for the first AI Buddy cohort; mentored a team that won the audience vote at the third AI demo contest

·Ran the second and third AI demo contests and taught hands-on sessions rated 5/5 for satisfaction and 4.5/5 for practical usefulness

CHAAK

[Discontinued] A social network for playing with stickers.

·Optimized SEO through website internationalization, metadata fixes, and search engine registration

·Built and launched a new-user acquisition event featuring pinch-zoom and drag sticker placement, increasing weekly sign-ups by 1,300% over the average after launch

Next.js(App Router), TypeScript, Tailwind, Storybook, Vercel, Amplitude

Uncutgems Company

Frontend Engineer Lead | Jul 2023 ~ Oct 2024

Fabrill

A commerce platform specializing in second-hand luxury jewelry.

·As a founding member and lead, drove everything from stack selection to full-stack development, deployment, and operations — reaching 25K MAU while keeping monthly operating costs under $150

·Contributed directly to the Supabase open source project to unblock Kakao login, driving an 80% increase in new sign-ups

·Built an AI-powered product recommendation system using OpenAI embedding models, improving click-through rate more than 7x (5% → 36.8%)

·Led data-driven improvements to the product listing UX (auto-fill), increasing listings by 50% and reducing related inquiries to zero (presented at FECONF2024 and FOSSASIA Summit 2025)

·Cut page entry time by 1.5 seconds by adopting Streaming SSR

·Improved purchase convenience with features like split payments, achieving a 30% increase in orders

·Set up an A/B testing environment with Growthbook and a design system based on Storybook and shadcn-ui, contributing to data-driven decision-making and developer productivity

·Kept the WebView app running reliably (CodePush, universal links) and automated Slack bot notifications to streamline service operations

·Built a data-attribute-based GTM guide and tracking system in collaboration with the marketing team, enabling them to run their own analyses

Next.js 14, TypeScript, Supabase, React Native WebView, shadcn-ui, Zod, React Hook Form, Vitest, GTM, Zustand, Cloudflare Images, Cloudflare Workers, Tailwind, Retool, Storybook, App Center CodePush, Vercel, Google Analytics

Greenlabs

Frontend Engineer | Feb 2022 ~ Jul 2023

Farmmorning

A community service for everyone working in agriculture.

·Developed 'Farming Diary' and 'Farming Ledger', productivity services for farms, participating from the planning stage

·Successfully rewrote a WebView-based app as a native React Native app, improving service stability and user experience

·Led modularization of the existing codebase and a home screen revamp, improving user accessibility and developer productivity

·Built a direct-trade marketplace for produce and farm machinery, expanding the service into e-commerce

·Wrote WebView integration guidelines to improve team collaboration

·Managed app builds, store reviews, and releases for stable service delivery

ReScript, Relay, React, Next.js, React Native, Tailwind

Farmmy

[Discontinued] A renewal and global version of Farmmorning.

·Developed React Native features to expose native app capabilities to the WebView

·Improved WebView navigation for a more natural UX

·Managed testers and app distribution with AppCenter

·Wrote a local development setup guide and architecture flow charts on the GitHub Wiki

ReScript, React Native, Next.js, AppCenter

rescript-bindings

An open source collection of external library bindings for ReScript.

·Set up the monorepo

·Automated npm publishing with GitHub Actions

Lerna, GitHub Actions, ReScript

Raonstory

FullStack Engineer | Jun 2021 ~ Nov 2021

Blockchain-based Service Development

·Developed blockchain backend APIs using Hyperledger Aries, including Indy ledger connections, agents, and mediators

·Built the official React-based website and refactored existing frontend layouts

React, Aries Framework, Node.js, TypeScript, Express.js, Swagger, JavaScript

AiRISS

FullStack Engineer | Apr 2020 ~ May 2021

Korea Customs Service AIXAC System

Designed and developed multiple modules — portal, viewer, and simulator — for the Korea Customs Service's AI-based cargo inspection system.

·Built the inspector-facing viewer, implementing bounding-box visualization of AI-identified cargo and real-time data delivery over WebSocket

·Designed and developed the real-time server performance monitoring screens for the AIXAC portal

·Proposed a Python-based redesign to resolve frequent failures in the legacy C# system and set the initial development direction

·Built a development simulator for the air-gapped environment (MSSQL, TCP communication, file generation flows)

Go, Python, JavaScript, Flask, Node.js, Express.js, MSSQL, jQuery

IGLOO Corporation

Security Consulting Intern | Aug 2019 ~ Feb 2020

Security Consulting & Work Automation

Performed web vulnerability remediation checks for critical ICT infrastructure and built work automation tools.

·Performed web vulnerability remediation checks on critical information and communications infrastructure

·Built a notice mailing system and report-writing macros with Node.js and VBA, streamlining routine work

Burp Suite, Node.js, VBA, Wireshark

Other Experience

Awards

· Grandeclip Outstanding Employee Recognition — H1 2026

Talks

· FOSSASIA Summit 2026 - Taming Large Image Lists in React Native · Supabase Launch Week 15 Seoul - Supercharging Kakao Login on Supabase · FOSSASIA Summit 2025 - Enhancing Form Usability through UI Changes: Reducing Complexity · FECONF2024 - Frontend-led Commerce Service Development: Making the Most of Tools· 2023 Fengineer Con - Don't Be Afraid of Solo Projects· System.out.Girls - It's Okay to Make Mistakes!· FECONF2022 - Let's ReScript Together· SojuCon Shot 1 - Good Questions Make Good Answers, with Relay

Open Source

· supabase/supabase · supabase/auth · projectdiscovery/nuclei · EveryAnalytics/react-analytics-provider · EveryAnalytics/web-analytics-handbook

Community

· Korean FE Article Team· DEFY DEFAULT - Co-Founder· Women Who Code - Local Organizer of Seoul Chapter

Certifications

· ISO 27001 Lead Auditor Course· Linux Master Level 2