Jang Ho Hwang

Built a unified LLM routing gateway (akin to OpenRouter) that proxies requests across OpenAI, Anthropic, Google Gemini, and xAI Grok via a single OpenAI-compatible API. High-performance streaming proxy in Rust (Axum/Tokio), Django backend for billing and analytics, React 19 dashboard. Features include rate limiting, Korean PII masking for regulatory compliance, load balancing, and async processing via Redis Streams. Deployed on AWS ECS with HAProxy and EFK logging.

Contributed to the development of an AI-powered coding agent (similar to Lovable and Bolt) using Python and TypeScript. Focused on maintenance, feature development, and performance optimization. Worked extensively with Claude Code for development workflows.

• Architected and launched a personal diary application with AI-powered features on Apple App Store • Developed robust REST APIs using Django-Ninja with PostgreSQL, implementing best practices for scalability • Integrated LLM capabilities via LiteLLM to generate intelligent, contextual comments on user entries • Leveraged state-of-the-art LLMs to accelerate development, achieving 1,600+ commits in 4 months • Implemented performance-critical components in Rust to improve response times on resizing photos.

• Architected and implemented RESTful APIs and infrastructure for Japanese e-commerce platform nugu.jp • Developed and maintained e-commerce webapp using Next.js, TypeScript, and Bootstrap • Developed comprehensive back-office tools using Django and Svelte, improving operational efficiency • Enhanced the delivery tracking system by introducing parallel processing, drastically reducing response time • Mentored development team on Django best practices, resulting in improved code quality and feature delivery

• Led technical architecture and implementation of company-wide REST APIs using Django, React, and PostgreSQL • Achieved 75% reduction in AWS infrastructure costs through strategic optimization and resource management • Collaborated with CEO to define and execute technical strategy, ensuring scalability for user growth • Provided technical leadership and mentorship to cross-functional development teams • Built and managed fully remote engineering team across multiple time zones

• Spearheaded the development and launch of a K-POP fandom mobile application using Flutter, reaching 10K+ users • Architected scalable REST APIs using Django and PostgreSQL to handle high-traffic fan events • Developed proprietary CMS in collaboration with operations team, reducing content publishing time • Engineered real-time video broadcasting service using WebRTC, RTMP, and FFmpeg with CUDA optimization

• Architected AI-powered chatbot engine for Kakao’s smart speaker using Java Spring and MongoDB • Developed comprehensive chatbot management console using Angular, serving 50+ internal staffs • Collaborated with AI research teams to integrate advanced NLP capabilities into production systems • Successfully ported high-traffic messenger (KakaoTalk) server from Linux to macOS, enabling faster local development

• Co-founded company and led all technical aspects from architecture to implementation • Developed native iOS application using Swift with focus on performance and user experience • Built RESTful API backend using Flask and SQLAlchemy with comprehensive test coverage • Deployed and managed AWS infrastructure (EC2, S3, CloudFront, RDS) achieving 99.9% uptime • Mentored two junior developers, improving their technical skills and career progression

• Designed and implemented comprehensive UI test automation platform for “Need for Speed Edge” • Utilized Angular, Node.js, TypeScript, and Docker to create scalable testing infrastructure • Reduced QA testing time by 70% through automated test suite implementation

• Developed social music player Android application using Java and Android SDK • Maintained and optimized high-traffic Python API server handling 1M+ daily requests • Improved API response times by around 50% through database optimization and caching strategies

• Successfully ported Android application to tablet interface for expanding user base • Analyzed and optimized AWS infrastructure, reducing monthly costs by $200,000 • Enhanced Django application performance for high-traffic scenarios (10M+ daily requests) • Designed and implemented database sharding middleware using Java for horizontal scaling • Delivered all projects successfully while working fully remote across time zones