Software engineer focused on solving operationally complex problems and delivering reliable, polished products. I contribute from product planning through production operations, with customer experience as a primary design constraint. At VoltUp, I work across billing, customer-facing, charging, and roaming services in a microservices architecture.
Experience
LG Uplus VoltUp
Sep 2024 — PresentSoftware Engineer
EV charging joint venture between LG U+ and Kakao Mobility.
- Payments & Billing — Built multi-provider payment architecture and dead-letter queue (DLQ) recovery, preventing duplicate charges with database-backed atomic approval locks
- Promotions & Customer Products — Built reusable coupon and points systems, customer-facing backend services, and the VoltUp mobile app
- Reliability — Standardized graceful Pub/Sub shutdown and isolated external API failures across microservices
- Developer & AI Tooling — Built specialist-agent routing, first-pass log diagnosis, shared CI/CD workflows, and automated technical documentation
Kakao Style
Jun 2022 — Sep 2024Backend Engineer, Pricing Platform
Built external-to-internal product matching, dynamic pricing, and the Final Pricing API Developed Catalog Engine Page and lowest-price update pipelines for Naver Shopping and YouTube Shopping
Storelink
Mar 2021 — Jun 2022R&D Engineer
Built product-data collection and keyword-ranking analytics services Developed AdLink, Uzzit, Pugshop, and Friday
WhaTap Labs
Mar 2019 — Mar 2021Frontend Engineer
Built monitoring dashboards for infrastructure, JVM applications, databases, and Kubernetes environments.
Hamschout
Aug 2017 — Aug 2018SW Engineer
Built Itfluencer, a platform that connects advertisers with influencers for campaign delivery.
OpenBridge
May 2016 — Jul 2017SW Engineer
Developed AlarmTalk (alarm + chat), Potion (photo editing + missions), and the OpenBridge web platform.
VoltUp Projects (Sep 2024 — Present)
Multi-Provider Payments and Failed-Payment Recovery
Oct 2024 — PresentLed the payment service from initial architecture through production delivery, evolving a single-provider flow into a modular multi-provider platform. Added database-backed approval ownership and layered recovery to prevent duplicate charges and move failed or unpaid transactions into traceable, recoverable states.
Coupon and Points Promotion Platform
Coupon: Jul 2025 / Points: Aug 2025 — PresentBuilt reusable coupon and points services for partner campaigns including Nexen, Toyota, and Bluemembers. Applied coupon-level payment-method restrictions consistently across issuance, lookup, redemption, and operations-console workflows.
U+ VIP Monthly Coupon Integration
Jun 2026 — PresentConnected the customer app, coupon service, and operations console to issue monthly benefits for LG U+ VIP and VVIP members. Gave operations teams the lookup, eligibility checks, and assisted-issuance tools needed to resolve customer inquiries without manual engineering support.
Customer-Facing Backend and Kakao T Integration
Jul 2025 — PresentBuilt customer-facing backend services spanning four microservices, including Kakao T account and payment integration, Plug & Charge enrollment, failed-payment monitoring, and isolation of external-system failures.
VoltUp Hybrid App (Flutter for iOS and Android)
Dec 2024 — PresentLed delivery of the Flutter-based VoltUp 2.0 app, designing its WebView-to-native bridge and core flows for QR scanning, permissions, push notifications, and mandatory updates.
Browser-Based App Validation and Operations Tool
May 2026 — PresentBuilt a Chrome extension that reproduces app-dependent flows in the browser, removing the need to connect a mobile app for routine validation. Extended it with controlled API capture and replay for operational corrections not available in the operations console.
Voltbot - Agent Routing and AI-Assisted Incident Diagnosis
May 2026 — PresentBuilt Voltbot, an internal agent platform that routes employees to specialized agents based on intent, permissions, and agent availability. Developed an evidence-driven incident-diagnosis workflow that combines Cloud Logging, BigQuery, internal guidance, and code search across broken trace boundaries, then verified groundedness and cost improvements with an evaluation harness.
EV Roaming Reliability and Batch Operations
Feb 2026 — PresentRedesigned card-state recovery and resynchronization for Korea's public EV-roaming network, and made long-running Kakao T partner batches safe to stop and migrate without overlapping executions.
Developer Productivity and Delivery Automation
Oct 2024 — PresentStandardized recurring engineering work through automated first-pass reviews, shared CI/CD workflows, developer-environment tooling, documentation automation, and internal API conventions.
Kakao Style Projects (Jun 2022 — Sep 2024)
Mobile Proxy Infrastructure and Dynamic Pricing
Jan 2024 — Sep 2024Built a mobile proxy pool to keep product-data collection reliable under anti-bot restrictions, then automated dynamic pricing from competitor price comparisons.
External-to-Internal Product Matching
Feb 2024 — Sep 2024Replaced a one-to-one model with many-to-many matching that links external marketplace products to internal catalog products across stores and product types.
Final Pricing API
Dec 2023 — Sep 2024Consolidated channel-specific pricing rules into one API so coupons, promotions, and other benefits follow a consistent contract.
Membership Platform Migration
Apr 2023 — Jun 2023Redesigned membership tiers and migrated the legacy service to Spring Boot without downtime.
Catalog Engine Page and Lowest-Price Update Pipelines (Naver Shopping / YouTube Shopping)
Jun 2022 — Sep 2024Built shopping-feed and lowest-price update pipelines that kept Zigzag products eligible for Naver Shopping price comparison.
Earlier-Career Projects
Built backend services for commerce keyword and search-ranking analytics.
Built unified monitoring dashboards for telemetry collected from applications, servers, databases, and containers.
[Hamshout] Influencer Marketing Platform
Aug 2017 — Aug 2018Built an influencer-marketing platform where advertisers manage campaigns and creators participate in sponsored work.
Built a social alarm app that combines alarms and chat so users can help wake one another.
Built a mission-based photo app where users earn points and redeem them for photo prints.
Side Projects
Built a CLI and local web media manager that scans media files, combining FFmpeg and multimodal LLM analysis for smart file renaming, tag sidecar storage, and browser-based file management.
Commit Map Personal Project
OngoingA map-based travel planner for drafting itineraries, visualizing routes, and sharing trip plans through one link.
A multilingual resume and portfolio service that generates multiple layouts and print-ready PDFs from one YAML source.
Other Activities
Mentor, Kookmin University SW-Centered University Program
Mar 2024 — PresentMentored students in software architecture, problem-solving strategy, and flow design.
[Mentor Profile]Mock Interview Mentor, Codeit Backend Program
Sep and Dec 2025Provided technical and mock-interview coaching for backend program graduates.
Backend Mentor, Kernel360 (Cohorts 1–5)
Dec 2023 — Aug 2025Mentored five cohorts on team projects solving real company problems.
Backend Mentor, Kakao Tech Campus (2nd Cohort)
Jun 2024 — Aug 2024Mentored the second cohort of the Kakao Tech Campus backend track.
Guest Lecturer, Hanyang University ERICA Software Startup Program
Feb 2024Delivered an "Effective Backend" lecture for a software startup program.
Backend Mentor, Boostcamp Web·Mobile (8th Cohort)
Nov 2023 — Dec 2023Mentored two iOS service project teams.
Speaker, Hanbit N Microservices Monitoring Session
Dec 2023Presented the monitoring session in Hanbit Media's MSA seminar series.
Backend Code Reviewer, Boostcamp Web·Mobile (7th–8th Cohorts)
Sep 2022 — Oct 2023Led campus meetings and code reviews for web-backend campers across two cohorts.
Speaker, UbuCon Korea 2023
Sep 2023Presented "Building a Development NAS Using WSL."
Mentor, 2023 SW-Centered Universities Joint Hackathon
Jun 2023Provided frontend and backend technical mentoring and career guidance.
[Mentor Profile]Java Mentor, Programmers School (11th Cohort)
Mar 2023 — Apr 2023Provided technical Q&A, code reviews, and remote mentoring.
Guest Lecturer, React Course at Gyeongbuk Software High School
Sep 2022 — Oct 2022Taught a hands-on React course progressing from concepts to a final project.
Infrastructure Manager, Ubuntu Korea Community
Mar 2018 — May 2021Maintained the community forum, wiki, Q&A, and mail infrastructure.
Award Winner, AngelHack Seoul 2020 (Common Computer Prize)
2020Developed LiBi, a local group-buying platform, and received the Common Computer Prize.
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