I design and ship complete digital products, end to end.

Full stack developer based in Rouen, building web apps, internal tools and websites for local businesses. From framing through to launch, nothing is handed off halfway.

About

Building considered products, between design and engineering

I work at the point where technical architecture (cloud, microservices) meets information-system governance. Between my time at SNCF Connect & Tech and a dual engineering / business-school track, I've learned to build systems that are still standing, and still maintainable, years after launch.

Portrait of Sidney Djidji

Where I have worked, and what I build with

  • SNCF Connect & Tech
  • SNCF Optim’Services
  • Klint

What I build

From the first screen to a product that holds up in production

Four ways in, alone or combined. What does not change: I go all the way to launch, and what happens afterwards is agreed before we start.

  • Product design

    From user research to the final interface, I design flows built around real use and real conversion.

    Frame the product
  • Front-end development

    Modern, maintainable interfaces built with genuine attention to performance and accessibility.

    Build the interface
  • Full stack development

    I connect your interfaces to robust APIs and cloud-ready architectures.

    Build the back-end
  • Visual identity & interaction

    Art direction, motion and micro-interactions. The difference between a site that exists and one people remember.

    Give it an identity

How it works

From idea to a live product, simply

Four steps. At each one you know where the project stands and what comes next.

How I work
  1. You describe your project

    What you want to achieve, by when, and what already exists. I tell you straight whether I am the right person, including when the answer is no.

  2. We agree the scope

    What gets built, what does not, and in what order. Written down before anything starts: what is not in there does not surface at the end.

  3. I design and build

    In usable slices rather than one big delivery. You see the product running early, and you can change your mind while it is still cheap to do so.

  4. Launch, then what follows

    Domain, hosting, security: all in place before the announcement. What happens afterwards is agreed up front, not improvised.

Background

Interactive timeline

Spin the sphere to explore where I have worked and studied.

  • SNCF CONNECT & TECH

    Full stack developer (2022-2025). Rebuilt the digital ecosystem (Drupal/AWS), shipped collaborative platforms and led technical coordination.

  • SUPINFO

    Engineering master’s (2020-2025). Cloud architecture, microservices, blockchain and digital-systems governance.

  • IAE ROUEN

    MAE master’s (2025-2026). Strategic leadership (CSR), responsible innovation and organisational management.

  • SNCF OPTIM’SERVICES

    Innovation & business-analysis lead (Sep-Dec 2025). Ran participatory innovation and set up an innovation hub with Microsoft.

Local businesses

Run a shop or a studio? That’s a different conversation.

A website built for your place, your domain name, hosting and updates, for a monthly fee, with no commitment. Nothing to install, nothing to administer.

See the offer and prices

What I commit to

No promise of results: results depend on you and on the market too. What follows depends only on me, and you can hold me to it.

Written

Scope, decisions and exclusions are written down before anything starts. What is not in there does not surface at the end.

Early

You see the product running before it is finished. Changing your mind is cheap at the start and very expensive at delivery.

Whole

From framing to launch, with nothing handed off in the middle. One person knows the project end to end, and it is the person who built it.

Reversible

The code, the domain and the access are yours. You must be able to leave without rebuilding anything. Otherwise it is not a service, it is a hostage situation.

Work with me

Let’s talk about what you want to build

Four quick questions, then how to reach you. The more precise you are, the more precise my answer is.

You get an answer either way, including when I am not the right person for it.

What I am looking to build
Budget in mind
When you want to start
Where you are

No mail client? Write straight to sidneydjidji@yahoo.fr