Web app development agency

From company websites to admin tools and subscription services. AI builds it, and an AI from a different company reviews it.

Work that usually takes three months, done within two weeks.

Contact us

Web apps we build

Eigen is a development agency that builds web apps: company websites, admin tools, and subscription services. We build with Next.js, React, and TypeScript.

A builder AI works through the tasks one by one. Automated checks grade the work first. Then a reviewer AI from a different company looks at the result and the evidence.

You don’t need a finished spec. Bring the idea. The planning AI turns the gaps into questions and suggests a default for each.

  • Company websites

    Sites that introduce your company and what you offer.

  • Admin tools

    Screens where your team sees and runs the business, such as inventory, settlements, or usage, in one place.

  • Subscription services (SaaS)

    Sign-up, subscription billing, and a dashboard. DeskBot is one of these.

  • Services with AI features

    A support chat that answers from your documents, or a character that talks users through their results. DeskBot and Lumifox are examples.

You do three things

Give us the idea, approve the plan, and try it yourself at the end. Eigen handles the rest.

  1. You

    Idea

    Send an idea, a spec, or designs. We tell you what is missing first.

  2. Planning AI, your approval

    Plan

    We write the task list, the order, and the acceptance criteria. You approve, and we start.

  3. Builder AI

    Build

    Tasks are built one by one. Tasks that don’t depend on each other are built at the same time.

  4. Automated checks

    Grade

    Code grades the work. If it fails, it goes back to the build.

  5. Reviewer AI, other company

    Review

    It looks only at the result and the evidence, then decides pass or fail.

  6. You

    Final check

    You try it and confirm. If something needs fixing, tell us right away.

Why you can trust the result

  • Done only when the automated checks pass

    Code grades every task: the build, the lint rules, unit tests, and the acceptance tests set in advance. One failure and the task can’t be marked complete.

  • The builder never grades its own work

    The reviewer AI is a model from a different company. It never sees the builder’s explanations, only the result and the evidence.

  • Every merge rechecks finished features

    Each time a task is merged, every feature finished before it is checked again.

  • Follow progress on a live board

    Each task shows its status, the number of attempts, and the number of failing checks as they change. It’s there at night and on weekends too.

See what we’ve built

Frequently asked questions

Can I hire you for a web app without a spec?

Yes. An idea is enough to start. The planning AI collects the gaps as questions and suggests a default for each, with its reasons. You just choose.

What do you build web apps with?

We build web apps with Next.js, React, and TypeScript.

If I change a screen or a feature midway, do we start over?

No. We rebuild only what changed. If you need a new feature, we show you a new plan and add it once you approve.

How do you handle payment and API keys?

The spec lists names only. Real values are stored separately and used only while building and checking. They never appear in the code or the reports. A secrets check verifies this.

What do I get at the end?

All the source code with a record for every task, a web address you can open right away, the check records, a final report, and a checklist of what you confirm yourself.

Have a web app in mind?

Send us an idea or a spec. We start by sorting out what’s missing.

Contact us See other work