Web, Mobile, Desktop & TV applications that rise to your ambitions

Robust and scalable React & Next.js / React Native hybrid architectures that evolve with your business. Real agility and cutting-edge technical guidance, from product vision to production deployment.

Project transparency
100%Project transparency
of proprietary R&D
2 yearsof proprietary R&D
Late projects
0Late projects

They trust us.

Our digital agency's expertise is at the service of their projects: new projects, takeovers or modernizations. Same method, same high standards.

  • Orange - Référence client de l'agence web Async Code
  • Vinci Energies - Projet de développement réalisé par Async Code
  • Bimedoc - Accompagnement technique et développement par Async Code
  • Kairos Fire - Expertise digitale et collaboration avec Async Code
  • Rage - Référence client en développement d'applications
  • Smovengo (Vélib' Métropole) - Partenaire et client Async Code

Async Code

web agency Paris

1.

Asynchronous: A word developers know well, code that runs in parallel. We integrate into your work methodology.

2.

We don't follow market conventions, we study them, question them, and challenge them. Where many settle for assembling others' building blocks, we prefer to forge our own tools.

3.

Passionate web developers, a unified stack, shared rigor, a common requirement; uncompromising Made in France know-how.

Origine

Paris, 2023. Founded on one observation: web development deserves better than throwaway code billed at premium prices.

Asynchronous: a promise, becomes reality.

Code industrialization is the most underestimated challenge in the digital world.

For a decade, I watched the same scene repeat itself: Technical foundations are constantly reinvented, every project recreates the same functional building blocks, solves the same R&D problems and redefines patterns that already exist elsewhere. The real bottleneck of modern digital development lies in the lack of code industrialization, a cost paid by everyone at every stage of project growth.

Final products often emerge after invisible technical debt, accumulated while building the foundations. For SMEs, custom-built infrastructures represent a high financial risk, pushing them toward CMS or page builders to limit costs. In large enterprises, this generates a massive redundancy of uncapitalized features, with repeated mistakes and budgets wasted on solutions that already exist internally.

Non-industrialized code, unstructured knowledge, non-shared foundations — this holds back every business function, turns infrastructure into a risk, and caps the company's overall performance. Conversely, tech-led companies like Uber or Google rely on industrialized standards and consensus, enabling multiple teams to build on a common base for optimal business impact.

At Async Code, we flip the equation: we start from the finished product and the business need, with foundations, building blocks and architecture ready to go, obsessed with the transmissibility of knowledge. Beyond an app, we forge a proprietary industrial base, freeing companies to focus on added value.

Asynchrony fully comes into play — need becomes reality.

Maximilien Lentschener, CTO & FounderLinkedInMalt
FounderPortraitAlt

We understand your challenges

Every company is different. Some of your challenges are universal, others are more specific to your industry.

Shared challenges
Challenges specific to each type

Three rules. Non-negotiable.

Regardless of the project, the budget or the client. These three principles define how we work at Async Code since day one.

Total transparency

You have full visibility on progress, technical decisions and costs at every stage. Regular demos, direct exchanges with the developers, no gray area between the brief, delivery, and the end of our SLA/TMA.

Continuous R&D

We don't glue existing bricks together, we build our own tools. 2 years of R&D, a homegrown framework, shared components. Every client benefits from the work done for all the others.

A passion for code

We code because we love it. Clean architecture, performance, automated tests. Not code that sort of works, but code we're proud to show and that you'll be able to maintain in 5 years.

ImageBHeroAlt

What we offer

Your budget funds your business, not your stack.

Web Applications

Robust and scalable React & Next.js applications. Optimized load times, SEO/SEA-ready, multilingual LTR/RTL, RGAA accessibility, GDPR compliance: every technical component is a business lever built in natively. Designed to perform, indexed to be found, ready to address all your markets.

  • Showcase sites & landing pages
  • Custom business applications
  • E-commerce & marketplaces
  • Progressive Web Apps

Multi-platform Applications

Robust and scalable React Native applications. An industrialized architecture that deploys on mobile, desktop and TV from a single controlled codebase. Native platform features, integrated from day one. A single development cycle, a consistent experience on every screen, and drastically reduced maintenance costs.

  • iOS & Android
  • Desktop — Windows, macOS, Linux
  • TV — Apple TV, Android TV
  • Push notifications, biometrics, geolocation, offline mode

Backend & API

A backend architecture that doesn't need rebuilding for each project. Multi-tenant, configuration-driven, 7 security layers, complete auth, multilingual LTR/RTL. Designed to integrate, designed to last.

  • Multi-tenant architecture & microservices
  • Complete auth, 2FA, AES-256 encryption
  • Secure RESTful APIs & integrations
  • Integrated monitoring & analytics

DevOps & Cloud

Zero manual deployment, zero blind spots. Your environments are automated, monitored, scalable and traceable. Infrastructure becomes an accelerator.

  • CI/CD & continuous deployment
  • 24/7 monitoring
  • Automatic scaling
  • Versioning & traceability

Consulting & Advisory

Restoring technical consensus, unifying practices, industrializing what needs to be. The result is concrete: reduced maintenance costs, faster deliveries, teams that produce instead of reinventing.

  • Technical audit & assessment
  • Product scoping & architecture
  • Outsourced CTO
  • Standardization & industrialization

Our method, your visibility

Discovery

AuditScoping

We listen to your business before talking tech. Technical audit, needs analysis, scope definition.

Proposal

MockupsBudget

Technical architecture, functional mockups, fixed budget. You approve everything before we write a single line.

Development

IterationsDemos

Short iterations, regular demos. You see the product progress and give your feedback continuously.

Tests & QA

Auto testsPerf audit

Automated tests, performance audit, security review. Nothing goes to production without full validation.

Launch & Follow-up

DeploymentSupport

Zero-downtime deployment, team training, active monitoring. We're still here after delivery.

2 years of R&D. A unique foundation.

Tools

React.js

React

Reactive interfaces

Next.js

Next.js

SSG / SSR / App Router

Express.js

Express

Secured APIs

MongoDB

MongoDB

Scalable NoSQL

Infrastructure

Docker

Docker

Isolated environments

Kubernetes

Kubernetes

Automatic scaling

Terraform

Terraform

Versioned infrastructure

JavaScript end to end. A proprietary framework born from 2 years of R&D where every component benefits from the work done on all the others. Strong consensus and standards to industrialize our expertise and constantly improve.

See the architecture in detail

AI-ready development.

Every project ships natively compatible with AI engines. To go further, we connect and automate, on demand.

Native · Included in every project

1

Crawl & SEO · AI-ready

Structured data, semantic metadata, Schema.org and Open Graph markup: every page is designed to be understood by both Google and AI search engines. Your content ranks, gets cited, and feeds the generated answers.

Schema.orgOpen GraphSitemap
2

LLM Readability · llms.txt

Implementation of the llms.txt standard to expose a structured version of your site to language models. Your pages become reliable sources that AI can parse, summarize and faithfully reproduce.

llms.txtllms-full.txtCrawl optimisé

Custom · On demand

3

LLM API Integration

Connecting your products to the APIs of major models. OpenAI, Anthropic, Mistral. Generation, classification, extraction, conversational analysis: intelligence embedded in your business workflows.

ChatEmbeddingsRAG
4

Autonomous Agents · MCP

Agent architecture capable of orchestrating complex actions on your systems via the MCP protocol. Booking, order management, customer support — your tools become AI-controllable.

MCP ServersTool UseOrchestration

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