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xinqilin/README.md

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Typing SVG

👋 About Me

Senior Backend Engineer with 7+ years in Java / Kotlin, based in Taipei, Taiwan. I engineer and maintain enterprise-scale Billing & Payment systems and serve as first-line support for their production issues. I also bring hands-on SRE & Cloud skills and build LLM-powered developer tooling.

  • Backend: Java, Kotlin, Spring Boot, MySQL (SQL performance tuning), Python, JavaScript / TypeScript; also interested in Go.
  • SRE & Cloud: AWS, Docker, Kubernetes, Linux, Prometheus, Grafana — and always leveling up.
  • LLM tooling: Claude Code / Codex plugins, MCP servers, persistent dev memory — see below.
  • Also: 3+ years of React / Vue frontend exposure and about 8 months of Android development.

Pleased to meet you!

Highlights

Highlights: Engineered and maintained enterprise-scale Billing & Payment systems, serving as first line of support for production issues. Built automated end-to-end test pipelines, cutting a 30+ minute manual QA process down to minutes. Delivered internal tech talks to 200+ engineers and mentored new hires through code reviews.

SRE & Reliability

From commit to reliable production: Backend (Java / Kotlin) → Docker → Kubernetes → Prometheus → Grafana → SLOs & error budgets, running on AWS and Linux.

LLM & AI Tooling

I build LLM-powered tools that make day-to-day engineering faster and safer:

dev-memory: Claude Code & Codex CLI plugin that archives sessions into a local SQLite FTS5 memory with CJK-aware search, exposes memory_search over MCP, and turns code into locally reviewed tech docs opened as a PR. java-backend-skills: Claude Code & Codex plugin with 13 skills for Spring Boot + JPA on MySQL / PostgreSQL that catches lost updates, N+1 queries and wrong indexes: /code-review, /review-pr, /review-test, /write-test, /optimize-query, /design-solution.

Tech Stack

Core

Cloud & SRE

Exploring

GitHub Stats

More GitHub stats

Lines of code

I'm a Night 🦉

🌞 Morning    211 commits    ████░░░░░░░░░░░░░░░░░░░░░   18.48% 
🌆 Daytime    325 commits    ███████░░░░░░░░░░░░░░░░░░   28.46% 
🌃 Evening    379 commits    ████████░░░░░░░░░░░░░░░░░   33.19% 
🌙 Night      227 commits    █████░░░░░░░░░░░░░░░░░░░░   19.88%

📅 I'm Most Productive on Monday

Monday       198 commits    ████░░░░░░░░░░░░░░░░░░░░░   17.34% 
Tuesday      157 commits    ███░░░░░░░░░░░░░░░░░░░░░░   13.75% 
Wednesday    154 commits    ███░░░░░░░░░░░░░░░░░░░░░░   13.49% 
Thursday     132 commits    ███░░░░░░░░░░░░░░░░░░░░░░   11.56% 
Friday       176 commits    ███░░░░░░░░░░░░░░░░░░░░░░   15.41% 
Saturday     131 commits    ██░░░░░░░░░░░░░░░░░░░░░░░   11.47% 
Sunday       194 commits    ████░░░░░░░░░░░░░░░░░░░░░   16.99%

📊 This Week I Spent My Time On

⌚︎ Time Zone: Asia/Taipei

💬 Programming Languages: 
Java                     18 hrs 8 mins       █████████████░░░░░░░░░░░░   54.05% 
Markdown                 5 hrs 45 mins       ████░░░░░░░░░░░░░░░░░░░░░   17.16% 
HTML                     4 hrs 27 mins       ███░░░░░░░░░░░░░░░░░░░░░░   13.3% 
YAML                     2 hrs 3 mins        █░░░░░░░░░░░░░░░░░░░░░░░░   6.12% 
SQL                      1 hr 9 mins         ░░░░░░░░░░░░░░░░░░░░░░░░░   3.43%

🔥 Editors: 
Claude Code              19 hrs 39 mins      ██████████████░░░░░░░░░░░   58.56% 
IntelliJ IDEA            12 hrs 21 mins      █████████░░░░░░░░░░░░░░░░   36.81% 
VS Code                  1 hr 33 mins        █░░░░░░░░░░░░░░░░░░░░░░░░   4.63%

💻 Operating System: 
Mac                      33 hrs 33 mins      █████████████████████████   100.0%

I Mostly Code in Java

Java                     33 repos            ████████████░░░░░░░░░░░░░   48.53% 
Kotlin                   8 repos             ███░░░░░░░░░░░░░░░░░░░░░░   11.76% 
JavaScript               7 repos             ██░░░░░░░░░░░░░░░░░░░░░░░   10.29% 
HTML                     5 repos             █░░░░░░░░░░░░░░░░░░░░░░░░   7.35% 
TypeScript               5 repos             █░░░░░░░░░░░░░░░░░░░░░░░░   7.35%

Last Updated on 18/10/2026

Pinned Loading

  1. java-backend-skills java-backend-skills Public

    Catches lost updates, N+1 queries, and wrong indexes in Spring Boot + JPA code on MySQL/PostgreSQL. Code review, tests, and design skills for Claude Code and Codex.

  2. dev-memory dev-memory Public

    for any developer to write tech or maintenance doc by plugin

    TypeScript

  3. Vue-MaskMap Vue-MaskMap Public

    練習 Vue- 實作口罩地圖

    TypeScript

  4. spring-boot-CircuitBreaker spring-boot-CircuitBreaker Public

    Resilience4j on Spring Boot: annotations vs functional API, verified by one shared test suite

    Kotlin

  5. GO-Playground GO-Playground Public

    Go 圖解手冊：學習 Go （繁體中文版本），每章大圖解說加上可執行的程式碼與測試，附 Java 對照

    Go 1

  6. spring-boot-gRPC spring-boot-gRPC Public

    Learn gRPC: all four RPC modes, error handling, interceptors, deadlines and flow control, each proven by a test.

    Java