Freelancer profile translated to English.

Description

Full stack developer specializing in Node.js, React, HTML/CSS, and Rust, I help companies design websites, business applications, modern interfaces, and performance-oriented business automated systems.

I can work on complete projects: front-end, back-end, APIs, databases, dashboards, automations, CRM integrations, and internal tools. My goal is not just to deliver code, but to build useful, robust solutions that the business can leverage.

My areas of expertise:

- Web application development with React;

- Back-end development with Node.js;

- API and business tool creation;

- Database integration;

- Clean, responsive, and modern HTML/CSS interfaces;

- Workflow automation;

- Integration of AI tools into existing processes;

- Creation of dashboards, forms, CRMs, or mini-SaaS;

- Optimization of websites and landing pages for conversion;

- Rapid prototyping followed by progressive industrialization.

I can also work on more advanced issues with Rust when the project requires more performance, reliability, or technical structuring.

My profile combines web development, product logic, automation, and business understanding. I am particularly comfortable with projects that involve transforming an idea, a business need, or a manual process into a concrete digital tool.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

nabulio cie
Full stack dev
August 2020 - Today (5 years and 11 months)
React
Node.js
JavaScript
HTML
CSS
Full Stack Development
REST API
Rust
PostgreSQL
CRM
Automation
Artificial intelligence
Landing page
Dashboard
SaaS
Node.js React Native PostgreSQL Next.js Rust
mavie ingenierie
CT full stack dev
August 2020 - May 2026 (5 years and 9 months)
creation and maintenance of a custom CRM, 3-click Rust engine, frontend and backend full dev, horizontal AI automation.
Rust Node.js React Native Python
Mavie ingéniérie
FULL STACK DEV
March 2020 - Today (6 years and 4 months)
I develop internal tools and custom CRMs for SMEs and small businesses that no longer recognize themselves in market SaaS solutions — too generic, too expensive at scale, or unable to model their real business.
My specialties
• Custom business CRM (multi-object architecture, sales pipelines, lead scoring)
• Internal automations (workflows, follow-ups, document generation, tool synchronization)
• Dashboards and light BI (Apache Superset, Metabase, custom dashboards)
• API integrations (Stripe, Brevo, Pennylane, Notion, Slack, French public APIs)
• Data migration from Excel/Notion/Airtable to a clean relational database
Technical stack
Next.js 15, React, TypeScript, Tailwind, Node.js, Python, PostgreSQL, Supabase, Docker. Sovereign hosting (Hetzner, OVH) or classic cloud according to your needs.
What I've already delivered
I have built a production CRM myself with 12 interconnected objects (clients, projects, quotes, interventions, documents…) with 37 automations, BI dashboards, ML scoring, and integration of public databases with tens of millions of lines. This is what I can reproduce — in a simpler way — for you.
How I work
Fixed price preferably (clear scope, defined deliverable, no unpleasant surprises). Hourly rate possible for missions over 10 days. I deliver documented code that your teams or another provider can take over — no technical dependency.
Availability

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Ronan Sama

Full-stack & custom CRM Developer

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