Custom applications
Business apps, internal tools, client portals and custom websites — built around your logic, not the other way around.
Concrete impact
Built around your business
Zero contortion, zero workaround
Every screen, every page is designed for your real usage — whether it's an internal tool or the web front that speaks to your clients. Your teams stop hacking around Excel, and your prospects stop bouncing on a generic-looking site.
Full code ownership
No subscription, no lock-in
The code is yours from day one of delivery. No yearly price hikes, no dependency on a vendor who might disappear or change their pricing overnight.
Teams unblocked
Less daily friction
When the tool fits the work, your teams stop fighting against it. They do their job, not software workarounds.
Careful design, not generic
A look that feels like you
Websites, landing pages and interfaces designed with UX and art direction in mind. No warmed-over Bootstrap template: a visual identity consistent with your brand, animated cleanly, responsive down to the details.
This solution is for you if…
- //You have a business process that fits no tool on the market, or only fits at the cost of painful workarounds.
- //You use five different pieces of software where one integrated application would do the work faster and cleaner.
- //Your current site no longer looks like what you do, or was patched onto a template that peaked long ago.
- //You outsourced to an agency that vanished, or inherited a tool nobody maintains.
- //You want to stay the owner of your code, your data and your site — and stop depending on a vendor that raises prices every year.
What it costs you today
Many business owners live with tools that slow them down without realizing it. A shared Excel file that crashes with two users, an oversized CRM where 80% of the features go unused, a stack of email inboxes to track client files. Every workaround has a cost: time wasted, mistakes made, team frustration.
When the tool is undersized, you adapt to its limits. When it's oversized, you pay for what you don't use. Either way, your company works for the tool, when it should be the other way around.
On the website side, the pattern is often the same: a template bought five years ago, a builder that throttles anything out of the ordinary, or an agency site you have to call back (and pay) for every comma. The result: a front that ages fast, no longer embodies what you do, and that your prospects walk past without stopping.
A few concrete examples
A client portal for a service company, replacing endless email threads.
An internal tool to manage quotes and invoices, connected to your accounting.
A field intervention webapp for a team of technicians.
A team workspace to centralize HR documents and processes.
A mini-CRM tailored to your sales pipeline, where HubSpot is oversized.
A custom marketing site, with visual identity and careful animations — not just another template.
A campaign landing page, fast to load, designed to convert.
My 4-step method
Understand
Thirty minutes to understand your context. I tell you straight whether I'm the right person.
Scope
Within 48h, a fixed-price quote, precise scope, deadlines kept. No fuzzy hourly rate.
Build
I develop, I show you intermediate versions, you adjust as we go.
Hand over
I deliver the code, the documentation, a handover session. What I build belongs to you.
from €1,500
Fixed price, no surprise overruns. Precise quote within 48h.
What people ask me most
How long does delivery take?+
For a mid-sized business application, expect between 4 and 10 weeks depending on scope. I give you a firm deadline in the initial quote — not a fuzzy range.
What kind of budget should I expect?+
Every project is quoted at a fixed price, after an initial conversation. Budgets vary with scope and integration complexity, but you know the exact amount before signing — no hourly rate, no surprise overruns.
Do you also build websites?+
Yes — marketing sites, landing pages, public portals. Same standard as for business tools: careful design, modern stack, clean code. No warmed-over template, no builder that throttles. If you want a site that looks like what you do and lasts ten years, it's the same playing field.
Can you take over or rebuild an existing tool built by someone else?+
Yes, that's common — an agency that disappeared, a tool maintained by nobody, a half-finished project. I start with an audit of the code and the needs, then I tell you honestly whether it's better to build on the existing one or start clean — with a fixed-price quote either way.
What tech stack do you use?+
Modern, battle-tested stack: TypeScript, React/Next.js, Node, PostgreSQL. For websites, Next.js with Framer Motion animations and Tailwind for design. I adapt to the constraints of your IT when it needs to integrate with existing systems. The goal is always a stack any serious developer can pick up.
Are my data and my clients' data secure?+
We define hosting, access and data handling together during scoping. Security best practices and GDPR compliance are built into the design, not bolted on afterwards. Depending on your constraints, everything can stay in Europe.
Who owns the code?+
You do, fully, from day one of delivery. I hand over the source code, the documentation and a handover session. You can evolve it yourself, ask me again, or hand it to another provider — no lock-in.
What happens after delivery?+
You walk away with the code, the documentation and a handover session — the tool is yours, standalone. For what comes next, I offer an optional Epsiio Care subscription (maintenance, small additions, supervision) or one-off interventions as a Quick fix. Nothing is mandatory: you can also hand the maintenance to any developer.
Another question? Ask it directly — I reply within 24 business hours.
A need like this one? Let's talk.
Thirty minutes to check it's relevant. No commitment, honest, and useful even if we don't end up working together.