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Achievement: Pull Sharkx4Achievement: Pair Extraordinairex3Achievement: QuickdrawAchievement: YOLO

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gudcks0305/README.md

Chan / yuhyeongchan

Backend Engineer · Java / Spring · AI Runtime · Cloud & Distributed Systems

Building reliable backend services and practical tools, from AI evaluation pipelines to native macOS utilities.

▶ Explore an AI evaluation workflow

Animated diagram of an AI evaluation pipeline from request through durable queue and AI runtime to result

Selected Impact

50K messages ~40 / sec 10s → 1s
Queue preparation reduced from 2 hours to 1 minute Email delivery throughput with Amazon SES Java Lambda cold start with SnapStart

What I Build

  • Backend systems for AI interviews and evaluations, including LLM pipelines, durable job processing, and multi-tenant data workflows.
  • Event-driven services and cloud operations across AWS, Kubernetes, Kafka, and GitOps delivery.
  • AI applications with Spring AI, LangChain4j, OpenAI models, and speech-to-text / text-to-speech.
  • Local-first desktop tools, browser utilities, and native macOS integrations.
  • Open-source fixes and systems work in Rust, process memory access, and macOS tooling.

Open Source Contributions

  • VHS — Fixed GIF output not being generated after recording; merged upstream and included in v0.12.1. (Issue #787, PR #788)
  • CXX — Fixed cxx-build failures when shared-header paths cannot be written or linked; included in 1.0.202. (PR #1760)
  • FileBrowser — Fixed valid parallel uploads being interrupted by per-file inactivity timeouts; merged upstream and included in v2.0.7-beta. (PR #2950)
  • Wuma Tracker — Added native macOS tracker support with a Mach-based process-memory backend and shared Windows/macOS process abstraction. (PR #6)

Tech Stack

Explore technologies by category

Backend & APIs

Java 21 Spring Boot Spring Data JPA QueryDSL Python FastAPI

AI Runtime

Spring AI LangChain4j OpenAI STT / TTS Langfuse

Data & Messaging

MariaDB MongoDB Redis Kafka

Cloud & Delivery

AWS EKS Lambda Docker Kubernetes Argo CD CloudWatch

Systems & Open Source

Rust macOS Mach API Mach--O

Links

Pinned Loading

  1. gudcks0305.github.io gudcks0305.github.io Public

    TypeScript 2

  2. tab-voice-compressor tab-voice-compressor Public

    Chrome extension for real-time voice compression on HTML5 video and audio

    JavaScript

  3. clipboard-history-hud clipboard-history-hud Public

    Swift 1

  4. springmaster springmaster Public

    Fast multi-repository Spring Boot static-analysis orchestrator

    Java 1

  5. wuwamoe/wuma-tracker wuwamoe/wuma-tracker Public

    명조 맵스 네이티브 보조 툴

    Rust 16 7