AI agents that execute,
your team stays in control.

A compact senior team puts your budget into design and code, not into sales and management layers. You talk directly to the three developers and the designer who build the product, which speeds up decisions and avoids misunderstandings.

• No middlemen: the person who estimates is the person who delivers
• 10+ years of experience on web, mobile and AI products
• A stable team from framing to launch, with no junior rotation
• Lower overhead, so more budget goes into the product

We set a performance budget at design time: Largest Contentful Paint must stay under 2.5 seconds, Google’s “good” Core Web Vitals threshold. Accessibility is tested automatically with axe-core, then checked by hand against WCAG 2.2 level AA.

• Server rendering (Next.js), optimised images and non-blocking fonts
• Core Web Vitals tracked: LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1
• axe-core tests on every release + keyboard and screen reader checks
• Relevant since the European Accessibility Act took effect on 28 June 2025

AI cuts costs when it handles repetitive, high-volume tasks: email triage, data entry, document extraction, first-line answers. We connect large language models (LLMs) to your tools with n8n workflows or custom code, and a human approves sensitive decisions.

• n8n automations linked to your CRM, inbox and files
• Retrieval-augmented search (RAG) over your internal documents
• Bounded AI agents: precise scope, action log, human approval
• We tell you when AI is not the right fit

The audit analyses the public page of your choice across five dimensions and emails you a report signed 404-DEV, INC. It needs no access to your site and changes nothing: it reads the page like a visitor.

• Speed: Lighthouse score and LCP
• SEO and AEO: tags, structured data, readability by AI engines
• Accessibility: violations found by axe-core
• Security: HTTP headers, cookies, HTTPS
• Stack: detected technologies

With React Native and Expo, one codebase produces both the iOS and Android apps, which lowers development and maintenance costs. Screens stay native, and we write platform-specific code when the product needs it.

• One team, one codebase, two stores
• Faster updates and identical behaviour on both platforms
• Business logic can be shared with the website

The price depends on scope: number of screens, integrations, platforms and level of automation. After a free first call, we send a clear estimate split into stages, so you launch what creates value first.

• No-obligation first call, reply within 24 hours
• Staged estimates: you can start small
• Smaller budgets welcome when the scope is realistic

Yes. We audit the code and infrastructure, stabilise what needs it, then extend the product. When a focused rebuild is more responsible than a rewrite, we recommend it.

• Code, performance and security audit
• Prioritised stabilisation plan
• Progressive takeover with no service interruption

We work remotely with clients in France, Belgium, Switzerland, Luxembourg, Canada and the United States. We work in English or French.

• Regular video calls and demos
• Direct contact by WhatsApp or email
• Invoiced by 404-DEV, INC.