CRM & sales management
Leads, scheduled follow-ups, quotes, contracts, client history, dashboards: a CRM that follows your sales cycle — not a US vendor's.
Custom software · France & Poland · since 2011
Your business software,
delivered in weeks.
Not years.
CRM, client extranet, management application: I design and build the tool that fits exactly how you work. One point of contact — the engineer who writes the code.
- Clickable prototype in 10 days
- Fixed price, no surprises
- You own the code
Companies that trusted me with their tools
Sound familiar?
Your company grew. Your tools didn't.
“Our business runs on 14 Excel files and two people's memory.”
“We pay €800 a month for a SaaS and use 10% of it.”
“The ERP they quoted costs €80,000 and 18 months before the first invoice.”
“We type the same data three times: quote, invoice, tracking sheet.”
That is exactly what I fix: a tool built around your process — not the other way round.
Services
Four ways to give you your time back
Everything is custom-built, but after 15 years the needs look alike. Here is what I deliver most often.
Extranet & client portal
Your clients check their orders, results, reports and documents 24/7. Your team stops answering the phone for that.
Line-of-business applications
Field scheduling, production tracking, order management, vouchers, tickets: the tool your industry is still waiting for.
Integrations & automation
APIs, ERP, e-commerce, payments, e-signature, KSeF (Polish e-invoicing): your tools talk to each other, your team stops re-typing.
Work
Tools in production, used every day
A few representative projects. Each one started from a concrete problem, not an 80-page specification.
Analytical laboratory
Client extranet for laboratories
A portal where clients submit requests, track their samples and download their analysis reports. No more PDFs sent by hand and “where is my file?” phone calls.
Remote sales
Call-center CRM & lead management
Lead assignment, scheduled callbacks, contracts, support tickets, payments, reporting per agent and per client, internal chat, HR module. One application for the whole team.
E-commerce · Poland
Online sales platform with Android app
Online shop, PayU and PayPal payments, PDF generation, automatic reminders and a mobile app connected to the same database.
Field sales force
Sales & partner application
Appointment booking, sales reps' calendar, orders, partner area, referrals, online terms. The central tool of a sales network.
Also: project management and roadmaps, production tracking, vouchers for restaurants and salons, installation scheduling, ERP and KSeF integrations.
Method
From idea to production, with no black box
You see something concrete by week two. You never pay for anything invisible.
-
01
30-minute call
You explain how you work today and what gets in the way. I tell you honestly whether custom software is the right answer — or not.
-
02
Clickable prototype
Within 10 days you navigate a mock-up of your future tool. We adjust it together, then I send you a fixed-price quote.
-
03
Development in sprints
A testable release every two weeks. You use it, you comment, I fix. No nasty surprises at the end of the project.
-
04
Go-live & follow-up
Deployment, team training, then maintenance and evolutions at your pace. The code is yours — you are never locked in.
Pricing
A price range before the first call
Every project gets a fixed price after the prototype. Here are the ranges seen on my projects, so you know right away whether we can work together.
Starter
€3,000 – 10,000
One precise problem, one focused tool.
- One application, one process
- Prototype + 2 to 4 sprints
- Examples: client portal, scheduling, order tracking
- Delivered in 4 to 8 weeks
Business
€10,000 – 25,000
The central tool of a team or department.
- Several modules, several user roles
- Integrations (ERP, payments, API, KSeF)
- Examples: full CRM, multi-client extranet
- Delivered in 2 to 4 months
Enterprise
€25,000 and up
The system the whole company runs on.
- Multi-site, multilingual, mobile application
- Data migration from existing systems
- Examples: light ERP, e-commerce platform + app
- Delivered in phases over 4 to 9 months
After go-live
- Maintenance & hosting: from €30 / user / month
- Evolutions: €125 / hour or monthly retainer
- −10% on the first project for every new client
Estimator
Estimate your project in 60 seconds
Three questions, an instant range. No email, no sign-up.
15 yearsof business software
40+applications in production
2 countriesFrance & Poland
3 languagesFR · EN · PL
Who writes your code
Jérôme Devouassoux
Software engineer · Founder
An ESIGELEC engineering graduate, I have been building management software for companies since 2011 — first in Paris, now in Poznań. Fifteen years of listening to business owners explain how they work, then turning that into tools that last.
No agency, no middleman, no junior learning on your project. You talk to the person who designs, codes, deploys and maintains your application. It is faster, cheaper, and it avoids misunderstandings.
FAQ
What business owners ask before signing
Why custom software rather than an off-the-shelf SaaS?
If a standard product covers 90% of your need, take it — I will tell you so on the call. Custom pays off when your processes are your competitive edge, when you pay licences for features you never use, or when you lose hours every week working around a tool that does not fit.
Who owns the code?
You do, entirely, upon payment. You receive the sources, the documentation and the credentials. You can host the application anywhere and have it evolved by anyone.
What if you are no longer available in 5 years?
That is exactly why I build with PHP and MySQL and no exotic framework: any web developer can take over the code. No dependency on one person or one niche technology.
How long does it really take?
Clickable prototype within 10 days. A focused tool ships in 4 to 8 weeks; a full CRM in 2 to 4 months. You use the first versions long before the project ends.
Where is the data hosted? GDPR?
On European servers (OVH by default) or on your own infrastructure. Daily backups, HTTPS, role-based access, audit logs: the GDPR baseline is built in from day one.
Do you work with companies in both France and Poland?
Yes, and often with both at once: Polish subsidiaries of French groups, Polish companies working with France. I work in French, English and Polish, with invoicing adapted to each country (including KSeF on the Polish side).
Contact
Let's talk about your project
Describe your situation in a few lines. I answer personally within one business day with a first opinion — and a slot for a call if it makes sense.
Or directly
kontact@iwin-softwares.pl +48 576 139 076Poznań, Pologne · FR · EN · PL