Client portals
A secure space where your clients follow their files, upload and sign documents and find their invoices.
Next.js development
Custom Next.js development
Iselia Projects builds your business tools with Next.js — client portals, back offices, dashboards, internal tools, SaaS MVPs — connected to your automations, your software and AI. You own the code.
- What we build
- Client portals, back offices, dashboards, internal tools, SaaS MVPs
- Stack
- Next.js (React), TypeScript
- Hosting
- Vercel or your own server, in Europe if needed
- Connected to
- Your automations, your software (APIs), AI models
- Ownership
- Code, documentation and data: yours
- First step
- Free 30-min assessment
What we build
The business tools your software is missing
When no off-the-shelf software fits the way you work, or when an automation needs a screen, we build the tool with Next.js.
Back offices and internal tools
The back office that fits your process: roles and permissions, approval flows, connectors to your software.
Dashboards and reports
Your metrics consolidated from all your tools, and reports that go out on their own to the right people.
SaaS MVPs
A first version of your product, to test with real users before investing further.
Interfaces for your automations
Human approval screens, run logs, settings: the automation stays under your team’s control.
Why Next.js
A solid foundation for a tool that lasts
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Server rendering and SEO
Pages rendered on the server or generated ahead of time: fast to display and readable by search engines, useful for a public portal or a SaaS.
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Performance
Automatic code splitting, image and font optimisation, caching: the tool stays fast, on mobile too.
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TypeScript end to end
The same typed language in the browser and on the server: fewer bugs, code that is easier to take over and evolve.
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The React ecosystem
The most widely used UI library: proven components, extensive documentation, developers easy to find if you take the code in-house.
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Front end and API in one project
API routes and server logic in the same place: that is where your automations, webhooks and AI model calls plug in.
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Flexible deployment
On Vercel (the company behind Next.js) or on your own server (Node.js, container): you are not locked into one host.
Hosting
Vercel or your own server
The choice depends on your data constraints, your budget and your team. It is documented in the proposal; accounts are opened in your name.
Vercel
The platform from the company behind Next.js: a deployment on every change, preview versions to approve before going live, a global delivery network.
- Simplest way to go live
- Previews of every change
- Account in your name
Your server or a European cloud
The application runs on a Node.js server or in a container, with the host of your choice or on your own infrastructure.
- Hosting in Europe available
- Data where you decide
- No dependency on a platform
Automations and AI
The tool and the automation, one system
A Next.js tool is not an island: it is the interface to your automations and your data.
- Automations run in the background; the tool shows their log and the cases a human needs to approve.
- AI model calls (Claude, GPT, Mistral or open source) happen on the server: your API keys are never exposed in the browser.
- APIs and webhooks connect the tool to your industry software (accounting, CRM, PMS…), your email and Google Workspace or Microsoft 365.
- A dashboard can also track the hours saved: the measurement after go-live can then be read right in the tool.
An honest comparison
Next.js, WordPress or no-code: the right tool for the job
Next.js isn’t always the answer. Our own marketing site runs on WordPress; our client area, on the other hand, was first built with Next.js.
| Our approach Custom Next.js Iselia Projects | WordPress Theme and plugins | No-code Bubble, Softr, Airtable… | |
|---|---|---|---|
| Marketing site, blog | PartlyPossible, often overkill | YesIts strength: easy editing, content | PartlyDepends on the tool |
| Business app (roles, workflows, data) | YesBuilt for it: custom logic, roles, APIs | PartlyPossible with plugins, quickly limited | PartlyYes, up to a certain complexity |
| Performance and SEO | YesServer rendering, fast pages | YesGood with a light theme and caching | PartlyVaries by platform |
| Integrations with your software and AI | YesAny, via APIs, on the server | PartlyPlugins or custom development | PartlyConnectors provided by the platform |
| Time to launch | PartlyA few weeks for a first version | YesQuick for a website | YesVery quick for a prototype |
| Ownership and reversibility | YesYour code, hostable anywhere | YesOpen source, hostable anywhere | NoDependency on the platform |
| Cost over time | PartlyInitial build, no per-user licence | YesLow for a website; paid plugins possible | PartlySubscriptions that grow with users |
Custom Next.js
Iselia Projects
- Marketing site, blog
- PartlyPossible, often overkill
- Business app (roles, workflows, data)
- YesBuilt for it: custom logic, roles, APIs
- Performance and SEO
- YesServer rendering, fast pages
- Integrations with your software and AI
- YesAny, via APIs, on the server
- Time to launch
- PartlyA few weeks for a first version
- Ownership and reversibility
- YesYour code, hostable anywhere
- Cost over time
- PartlyInitial build, no per-user licence
WordPress
Theme and plugins
- Marketing site, blog
- YesIts strength: easy editing, content
- Business app (roles, workflows, data)
- PartlyPossible with plugins, quickly limited
- Performance and SEO
- YesGood with a light theme and caching
- Integrations with your software and AI
- PartlyPlugins or custom development
- Time to launch
- YesQuick for a website
- Ownership and reversibility
- YesOpen source, hostable anywhere
- Cost over time
- YesLow for a website; paid plugins possible
No-code
Bubble, Softr, Airtable…
- Marketing site, blog
- PartlyDepends on the tool
- Business app (roles, workflows, data)
- PartlyYes, up to a certain complexity
- Performance and SEO
- PartlyVaries by platform
- Integrations with your software and AI
- PartlyConnectors provided by the platform
- Time to launch
- YesVery quick for a prototype
- Ownership and reversibility
- NoDependency on the platform
- Cost over time
- PartlySubscriptions that grow with users
Brands mentioned belong to their owners; no partnership is implied. If off-the-shelf software or a no-code tool is enough, we will tell you.
Method
From need to tool in production, in short steps
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01
Free assessment
In 30 minutes: your users, your data, your tools, what the tool must do first.
Free · 30 min
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02
Costed proposal
Scope, hosting, estimated recurring costs: you know what you pay before any commitment.
Before any commitment
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03
Iterative build
A demo at every step, on your sample data, so you approve before we go further.
A few weeks
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04
Go-live
Deployment, documentation and access handed over: accounts are in your name.
Your code
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05
Support, if you want it
Optional support plans with no minimum term: monitoring, adjustments, improvements.
Optional
FAQ
Questions about Next.js
Why Next.js rather than another framework?
For its server rendering (fast, indexable pages), TypeScript end to end, the React ecosystem and flexible deployment (Vercel or your own server). We still choose based on the need: for a content website, WordPress is often enough.
What tools do you build with Next.js?
Custom business tools: client portals, back offices and internal tools, dashboards and reports, SaaS MVPs, and the interfaces of your automations (human approval, logs, settings).
Can I host the application in Europe or on my own server?
Yes. The application can run on Vercel or on your own server (Node.js, container), with the host of your choice, in Europe if your data requires it. The choice is documented in the proposal.
Do I own the code?
Yes: the code, the documentation and the data belong to you, and the accounts (hosting, services) are in your name. You can evolve the tool yourself or with another provider.
How does the tool connect to my automations and to AI?
Through API routes and webhooks on the server: the tool receives the automations’ results, shows the cases to approve and calls AI models without ever exposing your keys in the browser.
Is Next.js a good fit for a simple marketing site?
It is possible, but often overkill. For a content website, WordPress is usually simpler to edit — which is what we use for our own marketing site.
How much does custom Next.js development cost?
We don’t publish prices: the cost depends on the number of screens and roles, integrations, AI usage, data to migrate, hosting constraints and the support you want. The free assessment lets us cost it.
Your tool
Let’s talk about the tool you’re missing
30 minutes to pin down the need, the users and the data, and find out whether a custom tool is the right answer.
Free 30-min assessment · No commitment · Your code