AI
In development
Jarvis
A personal AI assistant running fully locally on macOS. A router agent picks and executes real system tools: calendar, reminders, notes, messages, music, weather, web search.
Available for new projectsRouen — Paris
Product design & engineering
Sidney Djidji
Full stack developer
I design and build considered digital products with a measurable business impact.
Product designFront-end engineeringCreative development
About
Building considered products, between design and engineering
Full stack developer and project lead, combining hands-on engineering with the strategic view that digital transformation actually requires.
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.
Selected work
A selection of what I build
Visuals, a short write-up and direct links for each project.
SaaS
In development
Whos
AI-assisted prospecting SaaS. You describe your offer, Whos defines your ideal customer and generates a list of named prospects, with a public contact point and a tailored angle.
Mobile
In development
MenoCompanion
iOS app for tracking perimenopause and menopause: daily symptom logging, dashboard, and guidance generated by a language model.
Services
How I can support your next launch
Every engagement adapts to the product stage, the team size and the timeline.
01
Product design
From user research to the final interface, I design flows built around real use and real conversion.
02
Front-end development
Modern, maintainable interfaces built with genuine attention to performance and accessibility.
03
Full stack development
I connect your interfaces to robust APIs and cloud-ready architectures.
04
Visual identity & interaction
Art direction, motion and micro-interactions — the difference between a site that exists and one people remember.
Method
Frame it, build it, ship it, then look after it
The scope is written down before the first line of code exists. You see the product running early, and what happens after delivery is agreed up front.
Background
Interactive timeline
Spin the sphere to explore where I have worked and studied.
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 pricesWriting
What I learn by building
Concevoir des interfaces haut de gamme qui restent rapides
Une methode pratique pour equilibrer richesse visuelle et budget performance.
Read the articleDe Figma a la production : construire un systeme d'interface fiable
Comment transformer les decisions design en composants front-end reutilisables.
Read the articleWork with me
Ready to turn your next idea into a product?
I'm available for freelance work, product design and full stack collaborations.
Get in touch