Cantem · Paris · Web · Product · AI

We design, we build, we ship.

A small Paris studio that takes products from a blank page to production — websites, mobile apps and AI tools, with the engineering to keep them standing.

What we make

One studio, end to end.

01

Web & product

Marketing sites, SaaS platforms and back-offices — designed and engineered as one. From the first Figma frame to a fast, accessible, production deploy.

  • Next.js / React
  • Design systems
  • SEO & performance
02

Mobile apps

Native-grade React Native apps with the plumbing that makes them real: payments, banking links, push, native modules, store delivery.

  • React Native
  • Stripe / Plaid
  • CI/CD to stores
03

AI tools

Agents, RAG and integrations that earn their keep — with evals, guardrails and human-in-the-loop. Custom models only when they beat the API.

  • Agents & RAG
  • Evals / guardrails
  • OpenAI · Claude · Gemini
The line

We don't pitch decks. We ship products. Design and code, same hands.

The index · 23 shipped

Selected work, by name.

Real products for clients across law, real estate, finance, media, gaming and matters of the heart — built end to end. Hover a name to see it. Open it to read how.

  1. 01 JIMINI AI AI / R&D
  2. 02 Amata Mobile
  3. 03 Renault & Alpine, Outil IA interne AI / R&D
  4. 04 Coincidence Labs (ex-Misogi Lab) Web Platform
  5. 05 Junea (sous NDA) Web Platform
  6. 06 Koncile Web Platform
  7. 07 IDEEL Mobile
  8. 08 Arcads Web Platform
  9. 09 TF1 Info Mobile
  10. 10 Corpovisite Web Platform
  11. 11 Matrice AI / R&D
  12. 12 Schoolab Web Platform
  13. 13 LeBigDay Mobile
  14. 14 Celesta AI / R&D
  15. 15 Combigo Web Platform
  16. 16 PopInShop Mobile
  17. 17 Call Center Nexity AI / R&D
  18. 18 Digital People AI / R&D
  19. 19 PMPR Web Platform
  20. 20 Gwencloud Web Platform
  21. 21 Nexity Prédiction Foncière AI / R&D
  22. 22 QRcode (Feat Jaylo) Mobile
  23. 23 Octo Gaming Web Platform
The studio · Four people

Small team. Whole stack.

Cantem is four people who design, engineer and run the projects themselves — no hand-offs, no agency layers. The same hands draw it and build it.

  • Seif Habbachi CEO

    Seif Habbachi

    Plays three moves ahead. Seif keeps the build methodical and the code clean enough to outlive the brief.

    Download CV →
  • Jacques Perrin CTO

    Jacques Perrin

    The deep end. Jacques pushes every project toward the sharpest, most current thing it can be — then makes it ship.

    Download CV →
  • Timon Prata Front & Design

    Timon Prata

    Front-end and design in one hand. Timon can raise a whole interface overnight, with the taste that makes it land.

    Download CV →
  • Jean-Patrice COO

    Jean-Patrice

    Keeps the studio in sync. Jean-Patrice runs the client relationship and the schedule so work moves fast and stays on course.

    Download CV →
The stack · 19 disciplines

Deep tools. Used in anger.

Not a logo wall — the actual kit we reach for, from microservice architecture to LLMs running in production with evals and guardrails.

  • Node.jsNestJSExpress / FastifySymfonyDjangoFastAPIFlaskSpring BootgRPCCeleryArchitecture microservicesEvent-driven
  • ReactNext.js (App Router, RSC)TypeScriptTailwind CSSshadcn/uiRadix UITanStack QueryZustandReduxStorybookViteVue.jsAngularMaterial UI
  • AWS (Lambda, RDS, S3, SQS)AWS CDKSSTGCP / GKEDockerKubernetesTerraformAnsibleGitHub ActionsGitLab CIVercelNginxDatadog / Grafana / Sentry
  • RAG (Retrieval-Augmented Generation)Agents IA (CrewAI)AWS BedrockOpenAI APINLP (spaCy, NLTK)TensorFlowDataiku
  • PostgreSQLMySQLMongoDBRedisSQLiteAWS AuroraOpenSearchElasticsearchDrizzle ORMSequelizePrisma
  • REST / RESTfulGraphQLWebSocketsgRPCWebhooksFiles de messages (RabbitMQ, SQS, Kafka)CronJobsSOAP
  • Auth0NextAuth.jsJWTOAuth2RBACSSO (Keycloak, Active Directory)CyberArk
  • JestReact Testing Library
  • ZodPNPMHuskyCronJobFirebase
  • Roo codeCursorCopilot
  • StripeGoogle PayApple PayPaypal
  • Modules Natifs (Caméra, Maps, QR Code)Notifications Push (Firebase, Onesignal)
  • Expérience Blockchain
  • ZodPNPMHuskyFirebase
  • FigmaAdobe XDPhotoshopIllustrator
  • Travail d'équipeCommunicationRésolution de problèmesAdaptabilité
  • Anglais (Courant)Français (Natif)
  • IA/MLBlockchainWeb3
  • Agile/ScrumKanbanPratiques CI/CDTest-Driven Development (TDD)Culture DevOps
In their words · 12 clients

What the founders say.

CTOs and founders from law, finance, gaming, real estate and dating — many of whom came back for a second, third, fourth project.

  • We worked with Cantem early in our journey, and it was a real boost. They helped us lay solid foundations in Next.js — with genuine technical rigour but also a real understanding of our product. No need for long explanations: they grasped the stakes fast, proposed the right solutions, and moved in the right direction. Always available, sharp on project management, a pleasure to work with day to day. It's clearly thanks to them that we could bring the work in-house on healthy foundations. A smooth, effective and genuinely enjoyable collaboration.

    Tristan
    Tristan CTO - Koncile
  • Sharp professionals. I've had the chance to work with Cantem on several projects, and our exchanges were always as effective as they were enjoyable. Excellent engineers — they put their skills to work on complex business problems and slot into heterogeneous technical and business ecosystems. I recommend them warmly.

    WIZARDS TECHNOLOGIES
    Gael Coat CEO, WIZARDS TECHNOLOGIES
  • I had the occasion and pleasure of working with Seif on several JavaScript / Node.js projects. He is a professional in his domain, well organized and highly engaged.

    DIGITAL PEOPLE
    Amir Hashemi CTO, DIGITAL PEOPLE
  • Cantem was an exceptional partner from the launch of our product. Their tight three-person team enabled a fast, powerful kick-start, with an impressive breadth of ideas and languages. As a CTO, working with that kind of efficiency and creativity on a launch was the best.

    Stephan Bereux
    Stephan Bereux CTO - Jimini
  • Working with Cantem on Arcads was a very positive experience. Their methodical approach and technical expertise let us move forward with confidence. The team was always responsive and full of ideas, which made development far easier. A reliable, capable partner — plain and simple.

    Dylan Fournier
    Dylan Fournier CEO Arcads
  • Our collaboration with Cantem spans nearly six years and four distinct projects. That longevity alone speaks to the quality of their commitment. Faced with the complexities and constraints of some of our projects, their adaptability has always been remarkable. Knowing the Cantem team invests fully in the success of every venture is, for me, an essential mark of trust. Partners like that are genuinely rare in today's landscape.

    Cyril bodard
    Cyril bodard Operations Director, Memoritz & Co-founder, LeBigDay
  • Working with Cantem on these three projects was a real pleasure. Everything was delivered on time, and over the months real trust and rapport took hold. From now on, for my future projects, it's clear I'll only go through you. Without a shadow of a doubt! =)

    Jean-Christophe Villain
    Jean-Christophe Villain Co-founder, Coprovisit — Innovation Director, Archimede
  • I had the honour of working with Cantem to build an app and website from scratch. They were full of ideas and real craft. I highly recommend them!

    Malguy technology
    Quentin Director, Malguy Technology
  • Cantem supported us brilliantly throughout the design of our app — they had answers to every technical problem. They made the best decisions while staying perfectly aligned with our ambitions. Recommended!

    Pop in Shop
    Rachida Taleb Product Management, Datapart
  • Cantem, with their unshakeable calm, give a lot of themselves. They sometimes understand the projects better than their own authors, which lets them reframe, anticipate and save an enormous amount of time — both in decision-making and execution.

    LOOKING FOR
    Raphael Serafyn Manager, LOOKING FOR
  • Tailored solutions, delivered on time and with solid expertise.

    Fayçal Bousmaha
    Fayçal Bousmaha CTO - Ideel
  • I had the chance to work with Cantem as a full-stack developer, and it's exactly the profile you want in a startup. Very strong technically, hyper-autonomous, and formidable at zero-to-one: they start from a still-fuzzy idea and ship something that works. On top of that they're great listeners and quick on feedback, so things move fast and well. I recommend them without hesitation.

    Yannick Shaofeng Sun
    Yannick Shaofeng Sun Coincidence Labs