Spencer Zhao CoreSpeed · Cofounder and engineer San Jose, CA

Spencer Zhao

Engineer, cofounder, occasional side-project starter.

I’m building CoreSpeed and working on agents, memory, and backend systems. Here you’ll find my projects and notes on the decisions, bugs, and details along the way.

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Spencer Zhao
1,287 commits · last 12 mo
207 PRs · last 12 mo
19 public repos
2020 on GitHub since

What I do

01

CoreSpeed

I co-founded CoreSpeed. The current product gives AI agents managed app access, built-in tools, memory, and approval controls.

02

Backend & infrastructure

My work spans service APIs, gateways, app access, usage metering, and billing across CoreSpeed products.

03

Memory research & open source

Lore measures the gap between retrieving the right record and sending the right evidence to the model. I also maintain Zypher Agent.

Stack

across my projects
Languages & runtime
  • TypeScript
  • SQL
  • Python
  • Rust
  • Bun
  • Node.js
Web
  • React
  • Next.js
  • React Router
  • TanStack Router
  • Tailwind CSS
  • Astro
Backend
  • Cloudflare Workers
  • Durable Objects
  • Hono
Data
  • Postgres
  • pgvector
  • Neon
  • Drizzle
  • Supabase
Agents
  • MCP
  • Vercel AI SDK
  • Zypher Agent
Auth & billing
  • WorkOS
  • Neon Auth
  • Stripe
Dev tools
  • Claude Code
  • Codex
  • Vitest
  • Playwright
  • Storybook

Selected
work

All projects →
Current

CoreSpeed

Managed app access, built-in tools, memory, and approvals that travel with an AI agent. I work on its gateway, billing, and public launch.

  • Connectors
  • Memory
  • Approvals
APPS tools + memory corespeed.io ↗

BuildLog

Live

Turns a team's commits, PRs, and releases into draft posts for X, LinkedIn, and Bluesky.

  • Next.js 16
  • Supabase
  • AI SDK

Fixo

Started in late 2024 as HMLS. Today Fixo is an AI shop assistant for independent repair shops: it opens repair orders from customer descriptions, drafts estimates for staff review, and supports customer approval and scheduling.

  • AI shop assistant
  • Estimates
  • Shop workflow

Hive

Demo paused

A multiplayer coding-agent workspace. Claude Code or Codex runs in a cloud sandbox while teammates steer and review its changes. The public demo deployment is currently paused.

  • Claude Code
  • Codex
  • Vercel Sandbox

OrderCue

A local-first browser extension that captures Amazon orders for follow-up, reimbursement, and resale. It can carry reviewed details to Facebook Marketplace; optional sync exposes narrow agent operations.

  • Browser extension
  • Local-first
  • MCP

Zypher Agent

OSS

A minimal, open-source framework for building AI agents with full control over tools, providers, and execution flow.

  • TypeScript
  • Agents
  • Open source

FPGA Clock

A multi-function digital clock built in Verilog, running on an FPGA.

  • Verilog
  • FPGA
  • Hardware

Approach

I work across product and infrastructure: interfaces, backend services, and the seams between them. Identity, routing, state, usage, and billing all have to hold up in real use.

Writing

All posts →

Reading the source behind a memory

We tried keyword search, wider excerpts, and whole conversations. Then we checked what the extra accuracy would cost to keep.

Read →

Moving development onto my devbox

The migration took two attempts. Keeping a working copy on each machine was where I went wrong.

Read →

A headless devbox still needs a browser

A URL handler on my remote development machine led me into xdg-open dispatch, browser location, and the difference between opening a login page and finishing a login.

Read →

Get in touch

Let's talk.