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Yao Sun_

❯ whoami

Yao Sun

Senior Software Engineer

I build resilient distributed systems and the interfaces that make them feel effortless.

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Languages ✳Frontend ✳Backend & Infra ✳Observability ✳Local-first sync ✳WASM at the edge ✳Effect systems ✳Differential dataflow ✳

01Selected work

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Case studies in systems, interfaces, and the seams between them.

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01 2025 Team

Aurora β€” a programmable edge cache

A globally distributed cache with per-request invalidation rules, cutting p99 latency by 62% across 30+ regions.

RustCloudflare WorkersDistributed Systems
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02 2024 Team

Meridian β€” a typographic design system

A token-first component library adopted by 12 product teams, with a build that fails on contrast and motion-safety regressions.

TypeScriptSvelteDesign Systemsa11y
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03 2024 Personal β˜… 43,401

tracewatch β€” a tracing TUI

An open-source terminal UI for exploring OpenTelemetry traces locally, with flamegraphs that render at 120fps.

GoCLIOpenTelemetry
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04 2023 Personal

Kanji Garden β€” spaced-repetition, redesigned

A local-first kanji study app where your review history is a CRDT that syncs across devices without a server.

TypeScriptCRDTLocal-firstPWA
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02Capabilities

01 β€” Languages

  • TypeScript
  • Go
  • Rust
  • Python
  • SQL

02 β€” Frontend

  • Svelte / SvelteKit
  • React
  • Tailwind
  • GSAP
  • WebGL

03 β€” Backend & Infra

  • Cloudflare Workers
  • PostgreSQL
  • Kafka
  • gRPC
  • Kubernetes

04 β€” Observability

  • OpenTelemetry
  • Grafana
  • Prometheus
  • Sentry
Currently exploring Local-first syncWASM at the edgeEffect systemsDifferential dataflow

03Recent writing

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