Engineer · builder · curious observer
I’m Xinyi. I build analytics SDKs, prototypes, and small products that turn fuzzy behavior into something we can inspect, question, and improve.
Selected experiments · 2026
Proofs of concept are how I think: make the mechanism tangible, expose the trade-offs, and give people something they can poke.
Grouping first. Notification last.
A Datadog-native pipeline that normalizes uncaught Browser SDK errors, groups repeated occurrences by stable identity, and alerts only when a genuinely new issue appears.
From an SDK call to a durable signal and a dashboard.
An interactive, source-linked guide to the shared Browser, iOS, and Android diagnostics contract—plus sampling, aggregation, persistence, flushing, crash recovery, and failure semantics.
A useful prototype—with known semantic gaps.
Solution 2 demonstrates replaceable delayed snapshots and terminal-page delivery, but measures visible dwell and emits a separate completion event. It is exploratory, not shippable.
Proposed Solution 3: active attention on the original event.
The SDK holds Page Viewed in a delayed service, replaces its cumulative snapshot on heartbeats, and finalizes that same event with engaged time. Open pageviews remain unavailable to ordinary queries—a deliberate unresolved trade-off.
What breaks in shadow trees—and how to recover the signal.
A slide walkthrough and interactive test bench for click and form tracking across open, closed, and nested Shadow DOM boundaries.
A visual model of a deliberately opaque ecosystem.
An interactive explainer for reasoning about the actors, hand-offs, and constraints inside the iOS mobile attribution network.
From passive listening to line-by-line practice.
A language-learning playground with synchronized lyrics, word-level meanings and pronunciation, KTV mode, quizzes, memory lessons, and vocabulary coverage.
Notes from the workbench
Short essays about measurement, system behavior, and what changes once an idea meets a browser.
Copied snippets expose a boundary between customer configuration and platform responsibility.
Read note →Analytics systems · 6 minWhy “send an event” is often the least interesting part of reliable measurement.
Read note →About
My work sits around analytics SDKs and the browser: lifecycle edges, event semantics, automatic capture, and the places where “obvious” data becomes surprisingly hard to measure.
This site is my public workbench—part demo shelf, part notebook. Everything here is built to make a technical idea easier to see and discuss.
github.com/Mercy811 ↗