Web apps you can trust — built and tested end to end.
Full-stack development and Playwright test automation for teams that ship fast — from the author of playwright-repl and nextcov.
What we do
Full-stack development
New web apps, features and APIs — frontend to backend — delivered as fixed-scope projects with a clear finish line and a handover your team owns.
React · Next.js · TypeScript · Python/FastAPI · Java/Spring Boot · GCP · Azure
What sets us apart
Testing built in, not bolted on
Unit, integration and end-to-end tests from the first week, running in CI on every change. We build our own open-source testing tools — so your app ships with a test suite you can actually trust.
Refactoring without fear
A codebase everyone is afraid to touch? We add tests first, then pay down technical debt and modernize step by step — without breaking what works.
Already have an app but no tests you can trust? We also set up or rescue Playwright test suites on their own. → Test automation
Why it matters more with AI
AI coding assistants let teams ship more code than anyone can review line by line. AI features inside your product behave differently from run to run. Both make the same thing critical: automated end-to-end tests that check what users actually see, on every change.
We help teams move fast with AI — and still know their app works.
Built by Intelliz
Our own open-source testing tools — the same ones we bring to client projects.
- playwright-repl & Dramaturg — Interactive browser automation with record & replay, in the terminal, a Chrome extension and VS Code, plus an MCP server so AI agents can drive the browser. npm · Chrome Web Store · VS Code Marketplace
- nextcov — Code coverage for Next.js apps from Playwright end-to-end tests. npm · GitHub
- msw-terrarium — Isolated, stateful API mocks so Playwright tests can run in parallel safely. npm · GitHub
Led by Steve Zhang
Intelliz is the consultancy where Steve Zhang leads development. Steve brings 20 years of software experience — more than 10 of them building and testing web applications — including large codebases in financial services, insurance, telecom and B2B e-commerce, and is the author of playwright-repl and nextcov. Because we both build and test web apps, we know where they break — and how to keep them working.
From the blog
- nextcov — Collecting Test Coverage for Next.js Server Components — the start of a 6-part series on Next.js coverage
- Parallel, isolated Playwright mocks with msw-terrarium
- From 1.2GB to 24MB: How I Sped Up Our Next.js CI/CD Pipeline by 4× in One Afternoon
Let's talk
Tell us what you're building. A 30-minute call is enough to see whether we can help.
Book a 30-min call · or email steve.zhang@intelliz.io