AI-first software studio
Libellule Dev designs and builds AI-powered web applications, SaaS platforms, modern frontends and robust backends — from the first prototype to production at scale.
What we do
One team for the whole product: intelligent features, the platform around them, and the interface your users love to work in.
LLM-powered products, copilots, chat assistants and autonomous agents — grounded in your data with retrieval (RAG), protected by evaluation and guardrails, and tuned for cost and latency. We also add AI features to existing products: smart search, document processing, classification, summarization and workflow automation.
Multi-tenant products with authentication, subscriptions and billing, roles and admin dashboards — architected to grow from the first user to thousands.
Fast, accessible and responsive interfaces — from landing pages to complex web apps with real-time data and streaming AI experiences.
Reliable services, REST and WebSocket APIs, background workers, data pipelines and integrations with the tools you already use.
Containerized deployments, CI/CD, monitoring, backups and security hardening — infrastructure you don't have to think about.
AI engineering
A convincing demo takes a weekend. A reliable AI product takes engineering: the right models, your data, measurable quality and predictable costs.
Retrieval-augmented generation, vector search and structured tools, so answers come from your sources — with citations.
Multi-step agents that call your APIs, process documents, triage requests and hand off to a human when it matters.
Evaluation suites, guardrails, careful handling of personal data, and observability for every prompt and response.
The right model for each step — frontier, small or open-source — plus caching and routing that keep your unit economics healthy.
Illustrative pipeline — every step is measured.
How we work
You always know what's done, what's next, and what it costs.
We dig into your goals, users and data, and agree on what success looks like.
A working prototype early on, to validate the idea — and the AI quality — with real users.
Iterative development with regular demos, clean code, automated tests and documentation.
Deployment, monitoring and continuous improvement as your product and your users grow.
Technology
We choose tools for longevity and fit — not hype — so your product stays easy to run and extend.
Why Libellule
Libellule is French for dragonfly. With near-360° vision and four independently controlled wings, it can hover, turn on the spot and change course in an instant.
That's how we like to build software: see the whole picture, and move with precision.
Product, users, data and running costs — not only the code in front of us.
Frontend, backend and AI designed together, yet each can evolve on its own.
Short iterations and fast feedback, so changing direction never means starting over.
Tests, monitoring and security by default. What we ship is built to last.
FAQ
New AI-powered products, SaaS platforms and web applications, as well as adding AI features to existing software. We work on everything from MVPs that validate an idea to production systems that serve real customers every day.
Yes. We integrate with your current codebase and infrastructure — for example smart search over your documents, an in-app assistant, automatic classification and extraction, or automation of repetitive workflows — without rewriting what already works.
We are model-agnostic. Depending on the task, we use leading commercial LLM APIs, smaller fast models or open-source models you can host yourself, and design the system so models can be swapped as better or cheaper options appear.
We send models only the data they need, can use providers with zero-retention options or self-hosted models when data must stay in-house, and build in access control, logging and security best practices from day one.
Send us an email with a few lines about your idea or product. We'll reply with questions, then suggest a clear first step — usually a short discovery phase or a prototype.
Tell us about your product, your data and your timeline. We'll get back to you with questions and a clear next step.