把難解的系統問題，變成可驗證、可落地的工程改善。Turn complex system problems into practical, verifiable improvements.
從交易延遲、production incident、跨系統整合到既有架構改造，我沿著應用程式、資料庫、網路與基礎設施追查原因，形成有證據、可執行、可驗收的改善方案；需要時也參與實作、受控上線與驗證。From transaction latency and production incidents to integrations and architecture changes, I trace causes across applications, databases, networks and infrastructure, then use the evidence to plan changes and, where appropriate, carry them through implementation, controlled rollout, and verification.
三句話描述現況，先拿到一份書面的初步判斷。Three sentences on your situation. A written initial assessment to start.
單筆請求的示意 trace：圖中各段依序執行、互不重疊，合計 187 ms，包含鎖定與佇列等待；不代表整體請求的 P50／P99。實際 trace 需區分巢狀與平行區段，避免重複加總。Illustrative trace of one request: the shown segments run sequentially without overlap and total 187 ms, including lock and queue waits. This is not a request-population P50 or P99. Real traces require accounting for nested and parallel spans to avoid double counting.
什麼時候該找我When to bring me in
- Production 問題反覆發生，根因仍不明。Production incidents recur without a supported root cause.
- P95／P99 延遲、容量或可靠性開始限制業務。P95/P99 latency, capacity, or reliability is limiting the business.
- Legacy system 必須持續運作，無法直接重寫。A legacy system must keep running and cannot simply be rewritten.
- 架構改造或 migration 的影響範圍難以評估。The impact of an architecture change or migration is unclear.
- 問題橫跨應用程式、資料庫、網路與基礎設施。The problem spans applications, databases, networks, and infrastructure.
系統開始難做，通常是在它已經成功之後。Systems get hard to work on after they have succeeded.
系統運作多年、承載真實業務，並經過多個團隊修改後，重寫的成本與風險需要重新評估。這時候要回答的是改哪裡、什麼不能動、改完怎麼確認真的變好。Once a system has run for years, carries real business, and has been changed by several teams, a rewrite needs careful assessment. The questions become what to change, what must not move, and how to confirm the change actually helped.
先把整條路徑與限制看清楚，才能判斷該補足工程資源、調整架構，還是只需要修正其中一段。Understanding the full path and its constraints makes it possible to decide whether to add engineering resources, adjust the architecture, or fix one part.
問題不一定在程式碼裡。The problem is not always in the code.
從業務需求到 production 維運，每一層都在限制上一層能做的事。症狀出現的地方常常不是原因所在的地方，所以我不會只看一層。From business requirement down to production operation, each layer constrains what the one above it can do. Symptoms can surface far from their cause, so I do not read a single layer in isolation.
完整的分析層級與檢視維度 →Full analysis layers and review dimensions →從問題到證據，看清每一步判斷。Follow the reasoning from problem to evidence.
以下三個示範情境，依過往處理的問題類型重新整理。著重分析路徑、交付物與驗證方式，不代表特定客戶的實際系統或已完成成果。These three illustrative scenarios are adapted from types of problems encountered in past work. They show the reasoning, deliverables and verification approach, without representing a particular client system or a completed outcome.
三句話講清楚現在的狀況和你最擔心的部分就夠。首次聯絡的目的是確認這是不是我幫得上的問題。Three sentences on the current situation and what worries you most is enough. The first contact helps establish whether this is a problem I can help with.