App takeover
Take over your Next.js app without starting over
Your previous developer is gone. The app only partly works, the documentation is missing, and nobody knows which parts are safe to change. Dimensa takes over existing Next.js and React apps for founders, small businesses and agencies.
We start with evidence, not guesses. We inspect the repository, run the app where possible, follow the data, and check the build and deployment. Then we explain what is working, what is risky, and what should happen next.
Short answer
- You do not need to start again. Working pages, components, API routes, and integrations can often stay.
- We find the cause before changing code. We check the build, logs, data flow, hosting setup, and missing access.
- A rewrite is the exception. We only replace a part when keeping it creates more risk than fixing or extending it.
- You can send the basics first. A repository, live URL, hosting details, latest error, and desired result are enough to start. Never send passwords by email.
What we can take over
We take over existing Next.js and React codebases, whether we built them or not. This can include pages, components, API routes, forms, authentication, databases, Vercel deployments, environment variables, and third-party integrations.
The app may be half-working or difficult to run locally. We will separate working parts from risky parts. We do not change unrelated code just to make the codebase look different. The next step follows from what we can verify.
What you send us
Send the repository or the code that is available, the live URL, the hosting or Vercel project details, and the latest error message. The last known working version, local setup notes, and your desired result are also useful.
Tell us which access is missing. This may include the repository, hosting, database, domain, analytics, or external API accounts. Do not send passwords or secret environment values by email. Use a safe access method instead.
What you get after the first check
You get a plain-English summary of what we could verify. It covers how the app runs, what the build and deployment do, where important data flows, which errors matter, and which access or documentation is missing.
You also get the practical options: targeted repairs, continued development, a staged takeover, or a limited rebuild. For regular work, we start with a paid consult and then send a fixed-price proposal. For an urgent production outage, we start with a fixed-price diagnosis of no more than one hour, followed by a fixed-price proposal for the repair.
For outages, we send a written reply within 12 hours, including evenings and weekends. This is not a 24/7 service.
Takeover versus rewrite
A missing developer does not mean the whole app must be rebuilt. If the existing code is understandable and safe enough, we keep it and work from there. This protects the parts that already work and avoids introducing new migration risk.
Sometimes one part is too tangled, outdated, or unreliable to maintain. In that case, we explain which part should be replaced and why. A limited rebuild may be sensible, but a full rewrite is not included automatically and is never our starting assumption.
Proof from our own builds
In one of our own builds, a WebGL hero looked invisible. We instrumented drawArrays and readPixels instead of changing the camera or shader at random. The scene was drawing 30,912 points per frame. The real problem was contrast: #33445a was too close to the #0b1017 background.
In another of our own builds, frame rate rose from 29fps to 60fps after we removed one CSS class. We disabled layers one by one and found backdrop-blur-md on a fixed header over an animating canvas. The blur was recalculating the background on every frame.
We also found a form route in one of our own builds that returned success but only logged submissions to the console. Every submission was lost. We changed the route so it returns success only after persistent storage confirms the data was saved.
What is not included
New features, a full rewrite, major migrations, and work outside the agreed scope are not included automatically. We list them separately so you can choose what happens next.
Hosting, domains, databases, AI usage, API usage, and other third-party costs are separate unless we agree otherwise in writing. We can investigate these services when they are part of the app, but we do not become the provider of those services.
We document important changes and open access issues in the repository or handover notes. That makes it clear what changed, what remains, and what another developer would need later.
Start with the code you have
Send the repository or available code, the live URL, hosting details, the latest error, the last known working version, and the result you need. Mention which accounts or services you cannot access.
We will check whether the app can be examined safely and tell you what is still needed. Do not send passwords by email. We will explain whether a paid consult or an urgent fixed-price diagnosis is the right first step.
FAQ
Frequently asked questions
Can you take over a Next.js app that you did not build?
Yes. We work from the available repository, deployment information, logs, dependencies, and data flows. The previous developer does not need to be involved, although missing access or documentation may limit what we can verify.
Can you take over a React app if the previous developer has disappeared?
Yes. We start with the code, live app, hosting setup, and the last known working version. We list missing access and unknowns separately, so you know what has and has not been checked.
Do we need to rewrite our inherited Next.js app?
Not automatically. We keep working parts when they are safe to maintain. We recommend a limited rebuild only when a specific part creates too much risk. A full rewrite is an exception, not the default.
What do you need to investigate an inherited React codebase?
Ideally, we need the repository, live URL, local setup notes, hosting or Vercel details, deployment logs, relevant errors, and information about databases and external services. Do not send passwords or secret values by email.
Can you take over the Vercel deployment, database, and API integrations too?
Yes, we can inspect and work on the deployment configuration, API routes, database flows, and external integrations as part of the agreed takeover. The correct account access is required. Hosting and third-party service costs remain separate.
How does a Next.js app takeover start?
Regular work starts with a paid consult, followed by a fixed-price proposal. For an urgent production outage, it starts with a fixed-price diagnosis limited to no more than one hour. We send a written outage reply within 12 hours, including evenings and weekends. This is not a 24/7 service.