Software engineer focused on problem-solving and the completeness of services without limiting tech stack. Actively contributes from the planning stage to prioritize user convenience. Currently responsible for the overall billing and user-side services across multiple MSA environments.
Experience
LG Uplus VoltUp
Sep 2024 — PresentTech Innovation Tribe, Back-end
Billing - Improved payment and arrears-handling reliability with DLQ and multi-stage unpaid batches Promotions (coupon/points) - Improved customer retention User-side - Owned vehicle lookup, PnC (Plug & Charge) authorization, user-side backend, and the mobile app DX infrastructure - Standardized AI workflows and applied CI/CD integration and automated documentation
Kakao Style
Jun 2022 — Sep 2024Pricing System, Back-end
Final pricing service, product matching, Zigzag membership new development and migration, and shopping EP integrations (Naver Shopping / Google Shopping). Pipelines for external price collection and competitive position automation.
Storelink
Mar 2021 — Jun 2022R&D Engineer
Product-data collection and keyword-ranking analysis platform Developed AdLink, Uzzit, Pugshop, and Friday
Whatap Labs
Mar 2019 — Mar 2021Front-end Engineer
Frontend development for monitoring dashboards across infrastructure, JVM applications, and Kubernetes.
Hamschout
Aug 2017 — Aug 2018SW Engineer
Developed the Itfluencer platform matching influencers with businesses.
OpenBridge
May 2016 — Jul 2017SW Engineer
Developed AlarmTalk (alarm + chat), Potion (photo editing + missions), and the OpenBridge web platform.
Projects — LGU+ VoltUp
Multi-vendor payment system & arrears recovery
Oct 2024 — PresentLed payment design from the start; expanded from a single payment flow into a modular structure that supports multiple payment vendors, and improved payment-state consistency and failed/unpaid payment recovery through a layered arrears-management system.
Coupon & point promotion platform buildout and enhancement
Coupon: Jul 2025 / Points: Aug 2025 — PresentBuilt a reusable coupon and points backend for partner-driven promotions such as Nexen, Toyota, and Bluemembers, including coupon-pack payment-vendor restrictions across issuance, lookup, usage, and admin management.
User-side Backend
Jul 2025 — PresentDeveloped core user-side backend features including KakaoT account/payment integration across 4 MSAs, PnC (Plug & Charge) auto-charge, and unpaid-charge monitoring.
VoltUp Hybrid App (Flutter - iOS/Android)
Dec 2024 — PresentLed Flutter hybrid delivery for 2.0; designed WebView-native bridge flows and core app paths such as QR scanning, permissions, push notifications, and forced updates.
VoltUp App Validation & Ops Correction Extension
May 2026 — PresentBuilt a Chrome Extension that recreates app-dependent flows in the browser to reduce app-attachment validation delays, then extends into replayable single-API operational corrections not supported by Admin.
Roaming service reliability & performance
Feb 2026 — PresentRedesigned card-state management for the Ministry of Climate, Energy and Environment public roaming integration and added retry/monthly resync paths so baseline data can recover after missed events or transient failures.
Developer productivity & DevOps
Oct 2024 — PresentAI-first reviews, mobile CI/CD hardening, remote Gradle cache, iOS TestFlight automation, obfuscation policy, Firebase distribution, and internal Admin API standards.
Projects — Kakao Style (2022.06 — 2024.09)
Mobile IP Pool Proxy Infrastructure & Dynamic Pricing
Jan 2024 — Sep 2024Built a mobile IP pool proxy infrastructure to bypass crawling blocks and automated a dynamic pricing pipeline based on price competitiveness.
Internal/External Identical Product Matching
Feb 2024 — Sep 2024Overhauled 1:1 matching to an N:M structure to match identical products across all stores and types.
Final Pricing (Unified API for Service-Level Pricing Logic)
Dec 2023 — Sep 2024Unified scattered pricing logic into a single API so coupons, promotions, and other benefits follow one contract.
Membership & Mileage Migration
Apr 2023 — Jun 2023Redesigned membership tiers for retention and migrated the legacy membership service to Spring Boot.
Shopping Catalog Engine Page & Lowest-Price Updates (Naver Shopping / YouTube Shopping)
Jun 2022 — Sep 2024Enhanced price competitiveness of Zigzag products for exposure on Naver Shopping price comparison.
Projects — Earlier experience
Backend development for commerce keyword analytics service.
Developed integrated monitoring dashboards to visualize data collected from various agents (App, Server, DB, Container).
Influencer platform
Aug 2017 — Aug 2018Developed an influencer marketing platform for campaign management and influencer matching.
Social alarm service combining alarms and chat for mutual wake-up calls.
Mission-based photo filter app where users earn points for printing photos.
Personal Projects
Commit Map Personal Project
OngoingA map-based travel planning service built to share my travel plans and quickly draft route ideas.
A personal resume service that manages multilingual resumes and project portfolio pages from a single YAML source across multiple layouts, optimized for print and PDF output.
Other Activities
Kookmin SW-Centered University Mentor
Mar 2024 — PresentMentored students with a focus on SW architecture, problem-solving strategy, and user-side flow optimization.
[Mentor Profile]Codeit Backend Course Mock Interview Mentor
Sep, Dec 2025Conducted technical and mock interview mentoring for backend developer bootcamp graduates.
Kernel360 Backend Mentor (1st ~ 5th cohorts)
Dec 2023 — Aug 2025Participated as a mentor across the 1st through 5th cohorts, guiding collaboration-based projects that solved real company problems.
Kakao Tech Campus Backend Mentor (2nd)
Jun 2024 — Aug 2024Participated as a mentor for the 2nd cohort of Kakao Tech Campus backend track.
Hanyang ERICA SW Startup Lecture
Feb 2024Gave a talk on "Effective Backend" for the SW startup lecture series.
Boostcamp 8th Backend Mentor
Nov 2023 — Dec 2023Mentored two iOS service project teams for Boostcamp.
Hanbit N MSA — Monitoring session
Dec 2023Led the 9th session on Monitoring for Hanbit Media's seminar series.
Boostcamp 7th~8th Backend Reviewer
Sep-Oct 2022 / Sep-Oct 2023Conducted campus meetings and code reviews for web backend campers (7th and 8th cohorts).
UbuCon Korea 2023 Speaker
Sep 2023Presented on "Building a Development NAS using WSL".
SW University Joint Hackathon 2023 Mentor
Jun 2023Provided FE/BE mentoring and career counseling as a hackathon mentor.
Programmers School JAVA Mentor (11th)
Mar 2023 — Apr 2023Provided Q&A, code reviews, and video mentoring.
Gyeongbuk SW High School React Lecture
Sep 2022 — Oct 2022Conducted a React lecture series (Explanation > Clone Coding > Project) for vocational high school students.
Ubuntu Korea Community Infra Manager
Mar 2018 — May 2021Managed infrastructure (Forum, Wiki, ASK, Mail server) for the Linux community.
AngelHack 2020
2020LiBi, a group-buying and inventory-discount service for local small businesses Winner of the Common Computer Prize (KRW 2.4M)
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