Hank Kim
CV
Hank Kim

3-year full-stack developer with lead experience on production apps (MAU 300+). Specialized in backend optimization and AI-driven development workflows.

Projects

Natural Language to Rendering API Translation

ARX - 2024.11 - 2024.12 (2 months)

Natural Language to Rendering API Translation

Designed and implemented a natural language interface to control architectural rendering parameters. Translates user intent into precise API calls using GPT-4/Claude for semantic understanding.
NLPOpenAIAnthropicPythonFastAPIAPI DesignPrompt Engineering
AI Agent-Driven Development Workflow

ARX - 2024.11 - 2024.12 (2 months)

AI Agent-Driven Development Workflow

Leveraged Claude Code, Cursor, and AI pair programming to build ARX 10x faster than traditional development. Demonstrates modern AI-assisted engineering practices and workflow optimization.
AI AgentsClaude CodeCursorDeveloper ProductivityNext.jsPython
API Server Development

TtokTtok 365 - 2024.9 - 2025.3 (7months)

API Server Development

Led the backend development of a NestJS-based API server for a home services platform, architecting a scalable, high-availability AWS infrastructure.
nginxNestJSTypescriptPostgreSQLAWSDocker
Flutter App Renewal Development

Wclub - 2024.4 - 2024.10 (7 months)

Flutter App Renewal Development

Refactored legacy app code and implemented a Coordinator pattern to enable flexible flow management and rapid development of multiple app concepts.
FlutterDartFigmaGit
Matching Algorithm and Voice Chat Feature

Wclub - 2024.1 - 2024.3 (3 months)

Matching Algorithm and Voice Chat Feature

Developed 1:1 matching algorithm and voice chat functionality for the Wclub platform.
FlutterDartNestJsTypeScriptPostgreSQL
Flutter UI/UX Development

Nolto - 2024.1 - 2024.3 (3months)

Flutter UI/UX Development

Contributed to the frontend development of a Flutter-based history education platform, implementing core UI/UX and leading the integration of the Naver Map SDK.
FlutterDart
App API Performance Optimization

Paradise Hotel - 2022.2 - 2022.6 (5 months)

App API Performance Optimization

Reviewed and optimized the latency of all service APIs, improving efficiency and user experience.
nginxTypeScriptNode.jsOracleDBMongoDB
App API Server Design and Maintenance

Paradise Hotel - 2023.5 - 2025.6 (26months)

App API Server Design and Maintenance

Designed, developed, and maintained the on-premise API server (Node.js/Express) for the Paradise City Hotel's mobile app, expanding services from web to mobile.
ubuntunginxExpres.jsTypeScriptOracleDB
Pedometer and Check-in Feature for Rewards

Cashplace - 2022.2 - 2022.6 (5months)

Pedometer and Check-in Feature for Rewards

Developed a pedometer and check-in feature for a crowdsourcing and rewards app to expand B2C services. Integrated a pedometer and developed the UI/UX for the pedometer and check-in functions.
FlutterDart
Beacon-based Vehicle Boarding Recognition SDK Development

Loplat SDK - 2022.2 - 2022.5 (4months)

Beacon-based Vehicle Boarding Recognition SDK Development

Developed a beacon-based vehicle boarding recognition SDK for autonomous vehicles, including algorithm design, SDK architecture, and signal similarity comparison improvement.
AndroidJavaKotlin
Adjusting Standby Buckets Using a Sub-Process and A/B Testing

Loplat SDK - 2021.11 - 2022.1 (3months)

Adjusting Standby Buckets Using a Sub-Process and A/B Testing

To combat Android's background restrictions on location data, this project used a sub-process to adjust Standby Buckets. A/B testing confirmed a 45% increase in daily location requests per user.
AndroidJavaKotlin
Resolving App Battery Overconsumption & Slowness Issues

Cashplace - 2021.5 - 2021.5 (1month)

Resolving App Battery Overconsumption & Slowness Issues

Resolved critical battery drain and app slowness. Fixed battery issue (related to location permissions) using profiler/ADB. Improved performance by optimizing bottlenecks across the app, server, and database.
AndroidJavaKotlin
Sharing ANID Between Multiple SDKs Within a Single Device

Loplat SDK - 2021.4 - 2021.4 (1month)

Sharing ANID Between Multiple SDKs Within a Single Device

Developed a feature to share a single Anonymous ID (ANID) across apps using the same SDK on one device, anticipating possible ad identifier restrictions.
AndroidJava
Samsung Android 11 Device Waking Up Too Frequently Warning

Loplat SDK - 2021.3 - 2021.4 (2months)

Samsung Android 11 Device Waking Up Too Frequently Warning

Fixed the “Samsung device waking up too frequently” issue on Android 11 by optimizing ActivityRecognition.getClient intervals, reducing unnecessary wakeups and improving battery performance.
AndroidJavaKotlin
Store Closure Inspection Improvement and Prevention of Duplicate POI Creation for New Stores

Loplat Cook - 2021.3 - 2021.4 (2months)

Store Closure Inspection Improvement and Prevention of Duplicate POI Creation for New Stores

Improved the Loplat SDK’s recognition performance and automated the existing store closure inspection process, which had been inconvenient due to manual closure reporting through external chat platforms and the lack of inspection automation.
AndroidJavaKotlin
App MVP Pattern Adoption and Refactoring

Cashplace - 2020.8 - 2021.2 (6months)

App MVP Pattern Adoption and Refactoring

The Cashplace project had tightly coupled view, logic, and model layers, causing low readability and slow onboarding. Introduced the MVP pattern and refactored the project in Kotlin to improve structure and maintainability.
AndroidJavaKotlin
Background Location Permission Review and Client Distribution Guide Preparation Role

Loplat SDK - 2020.7 - 2020.9 (3months)

Background Location Permission Review and Client Distribution Guide Preparation Role

Because of Google Play’s review for background location access, client apps using the LoFlat SDK need guidance on how to pass the review smoothly.
AndroidJavaKotlin
Designing a Location Data Collection SDK

Loplat SDK - 2020.6 - 2020.10 (5months)

Designing a Location Data Collection SDK

Developed the location data collection logic as an SDK to simplify use across in-house apps and potential future client integrations.
AndroidJava
Check-in Feature

Cashplace - 2020.4 - 2020.6 (3months)

Check-in Feature

Designed and developed the CashPlace check-in feature across Android, server, and database, enhancing user retention through in-store engagement and location-based content.
AndroidJavaKotlin

Product

ARX

ARX

2026.11 - Present

AI agent-driven tool for architectural visualization. Enables natural language editing of architectural renders using advanced AI models and custom UX workflows.
TtokTtok 365

TtokTtok 365

2024.9 - 2025.6 (10months)

Home organization and housekeeping service matching platform app
Wclub

Wclub

2024.6 - 2024.11 (6months)

Premium Dating App
Nolto

Nolto

2024.1 - 2024.3 (3months)

Educational Program Platform
Paradise Hotel

Paradise Hotel

2023.5 - 2025.6 (26months)

Hotel & Casino Guest App
Loplat SDK

Loplat SDK

2020.6 - 2022.7 (26months)

Location Recognition SDK
Loplat Cook

Loplat Cook

2020.2 - 2022.7 (30months)

Location Data Collection Platform for Internal Staff
Cashplace

Cashplace

2020.2 - 2022.7 (30months)

Outsourced Location Data Collection Platform

About Me

I am a developer who enjoys using technology to solve complex and practical business problems, placing a strong emphasis on team communication. I am proficient in backend technologies and enjoy the challenge of optimizing system efficiency and aligning development strategies with business goals. My experience across various projects extends beyond the backend, which allows me to communicate effectively with developers in other domains. Currently, I am expanding my expertise by studying and researching Machine Learning.

Contact

Thank you for taking the time to review my portfolio.
I truly appreciate your interest.

You can reach me at hank.sh.kim@gmail.com

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