Available for new projects, Paris

More customers.
Less busywork.
Better decisions.

I build fast websites, tools and automation that bring businesses customers and save hours.

4,9★live client rating
100Lighthouse SEO / 100
~1,300neighbourhoods scored

Background: BNP Paribas · Valeo

Quang Dat · Paris EN / FR
Quang Dat LE
Software & data engineer
Websites Software Data Automation
The problem

Good work shouldn't be held back by weak systems.

Most small businesses lose customers and hours for the same three reasons, long before anyone picks up the phone.

01

Hard to find

If your site is old or missing, customers can't discover you on Google, so they go to a competitor instead.

02

Too much guesswork

Your numbers sit unused in spreadsheets and disconnected tools, so decisions run on gut feeling, not facts.

03

Too much manual work

Bookings, quotes, reminders and reporting eat the hours you should be spending on your real work.

What I do

Three fixes, and the proof.

Each capability with a real result you can go and check yourself.

Google Maps: Vy Nails ranked first for onglerie Noisy-le-Grand, 4,9 stars, 57 reviews Google Search Console: 521 clicks, 11.2k impressions, average position 3.4 over 3 months AI search names Vy Nails the top nail salon in Noisy-le-Grand Search Console query table: onglerie Noisy-le-Grand ranks position 1.7, vy nails 1.5 Google Maps, onglerie Noisy-le-Grand

Get found

A fast, SEO-built site so customers find you first.

521 Google clicks / 3 mo Rank #1.7, onglerie Noisy-le-Grand 4,9★ · 57 avis AI search · top pick
Hover a number to see its proof

Ranks around #1 to #2 on Google for local searches like onglerie noisy le grand, bringing 521 clicks from 11.2k impressions in three months.

Source: Google Maps, Search Console and AI search, 2026 See SEO plans

Automate the repetitive

Bookings, reminders and reports that run on their own.

VyNails online booking, a four-step appointment flow open 7 days a week VyNails services and pricing menu, browsable online with durations Booking flow, 4 steps, 7j/7
Booking flow Services & pricing 24/7 0% commission
Hover a tag to switch the view

Clients browse services and book themselves day and night, with no Planity and no marketplace commission.

Source: vynails.fr/booking See automation plans

Work smarter

Maps, dashboards and models that turn your data into decisions.

Interactive map scoring Paris neighbourhoods from 0 to 100 by investment attractiveness SHAP explainability chart ranking credit-risk features Monte Carlo stock-research dashboard with a GARCH price cone Home Loan Scoring, SHAP
Credit scoring Quant research Real-estate map
Hover a tag to switch the project

Three shipped projects: a Paris investment map, a credit-risk model, and a live quant research API.

Source: github.com/qle107 See data & AI plans
Selected work

Built like products, not pages.

Real websites and tools, each built around one business problem.

VyNails93 live booking site, a nail bar in Noisy-le-Grand vynails.fr · live
Local business · Live

VyNails93

A commission-free 24/7 booking site that ranks top of local Google results.

4,9★ · 57 Google reviews SEO 100 / 100 LCP ~0,12s · CLS 0 521 clicks / 3 mo
Source: Lighthouse + Google Search Console, 2026 Visit the live site

Design concepts

Self-directed, to show range
Furniture · Concept

Stand'up Conception

A tactile motion concept for a bespoke wood and furniture workshop.

QANH Paris, a luxury hotel concept site
Hospitality · Concept

QANH Paris

A calm, editorial concept for a private Parisian maison.

Data & ML

Models and pipelines that ship.

See the data & ML work

A Monte Carlo quant-research API, a Paris real-estate map scoring ~1,300 neighbourhoods, and credit-risk models — full write-ups and live demos on the data page.

Prior roles

The engineering behind the work.

Measured results from my prior roles — data scientist at BNP Paribas, engineer at Valeo. The same engineering discipline goes into every freelance project I ship.

-70%
reporting time
BNP Paribas
-30%
cloud cost
BNP Paribas
-50%
deployment errors
Valeo
+25%
system efficiency
Valeo

These are results from my roles at BNP Paribas and Valeo, not client-project figures. For freelance work I show what I can prove: live client sites serving real customers and open-source projects you can read on GitHub.

Why work with me

An engineer who delivers.

One person for design, building, data and automation, so nothing gets lost between teams.

Fast

Your pages open in an instant, so visitors stay longer, and a fast site is easier for Google to rank well.

Reliable

Built with the same engineering discipline I use at BNP Paribas. Tested, secured, and made to keep working.

Practical

Every project starts from the business problem, not the technology. If it doesn't move a number that matters, I question it.

End to end

Design, development, data and automation live in one place, so there are no middlemen and no lost details.

About

Paris · works in French & English · ex Valeo · one-time build, then monthly care

Next.js React Python Machine learning Online booking Automation SEO Security

Why I build both.

I started building websites because the local shops around me had old sites that brought in no customers. Great work, invisible online.

As a data scientist at BNP Paribas, I saw I could join coding and data to build the whole thing, from the website out front to the tools working behind it. That is qdat107: one builder, everything covered, from first idea to launch.

Pricing

Scoped around the problem, not a fixed package.

Every project is a one-time build fee plus optional monthly care. Clear prices, no surprises. Here is the full menu.

01Website
02Business tool
03Data project
04Automation

Have a problem worth solving?

Tell me what is slowing your business down. I'll help you figure out what to build. I reply within a day.

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Email lequangdat1071@gmail.com LinkedIn linkedin.com/in/qdat
Based in Paris, France
Response time: usually within a day