Businesses rarely struggle because they lack features. As companies grow, they often outgrow the software they started with. Manual processes become bottlenecks, disconnected systems create inefficiencies, and applications that once worked well begin limiting the business instead of enabling it. That's where I help.
I specialize in building SaaS platforms, CRM systems, business applications, customer portals, and mobile products that streamline operations, automate workflows, and continue supporting organizations as they grow.
Over the past 10+ years, I've delivered production software across healthcare, education, logistics, aviation, industrial operations, professional services, and eCommerce. My experience spans the entire product lifecycle, from solution architecture and backend engineering to cloud infrastructure, third-party integrations, deployment, and long-term product evolution.
## What I Build
✔ Multi-Tenant SaaS Platforms
✔ CRM & Business Management Systems
✔ Workflow Automation Solutions
✔ Customer & Employee Portals
✔ Business Dashboards & Internal Tools
✔ Flutter Mobile Applications
✔ React & Next.js Web Applications
✔ AI-Powered Business Features
✔ Stripe Subscription Platforms
✔ Enterprise API Integrations
## Production Experience
One of my flagship projects is a production multi-tenant SaaS CRM platform that businesses rely on every day to manage customers, subscriptions, communications, reporting, and operational workflows.
Key capabilities include:
• Multi-tenant architecture
• Stripe subscription billing
• AI-powered customer assistance
• Lead and customer management
• Customer and employee portals
• SMS and email automation
• Role-based access control
• Reporting dashboards and analytics
• Secure third-party API integrations
This isn't a prototype or portfolio demo—it's production software supporting real businesses, real teams, and real users every day.
I've also developed AI-powered healthcare applications where success depended on far more than integrating an LLM. The challenge was designing dependable AI workflows through prompt engineering, backend validation, structured orchestration, and application-level guardrails that deliver reliable, trustworthy responses.
Additional experience includes industrial real-time monitoring platforms, enterprise education systems, field-service mobile applications with offline capabilities, blockchain applications, and enterprise software that automates complex operational processes.
## Core Technologies
**Frontend & Mobile**
Flutter • React • Next.js • TypeScript • Dart • Flutterflow • React Native • Expo • TypeScript • JavaScript • HTML5 • CSS3 • Tailwind CSS • Material UI • Shadcn UI • Redux Toolkit • Zustand • React Query • Framer Motion • Responsive Design • PWA
**Backend**
Node.js • Python • FastAP • I NestJS • Python • FastAPI • Django • Flask • REST APIs • GraphQL • WebSockets • JWT Authentication • OAuth • Firebase • Supabase • Serverless Functions • Microservices
**Data**
PostgreSQL • MySQL • MongoDB • Supabase • Firebase Firestore • Redis • Prisma ORM • Drizzle ORM • SQL • Database Design • Data Modeling • Row Level Security (RLS)
**Infrastructure**
AWS • Docker • Docker Compose • Kubernetes • Nginx • GitHub Actions • CI/CD • Vercel • Cloudflare • Linux • DigitalOcean • Render • Railway • Firebase Hosting • Supabase Cloud • Infrastructure Automation
**Integrations**
Stripe • PayPal • Twilio • SendGrid • Google Maps API • Google OAuth • Firebase Authentication • Clerk • Auth0 • REST APIs • GraphQL • Webhooks • Third Party API Integration • Payment Systems
Cloud & AI
OpenAI API • Anthropic Claude API • Google Gemini API • LangChain • AI Chatbots • RAG • Prompt Engineering • AI Workflow Automation • Vector Databases • Embeddings • LLM Integration
Testing & Quality
Playwright • Cypress • Jest • Vitest • React Testing Library • Unit Testing • Integration Testing • End to End Testing • Performance Optimization • Debugging • Cross Browser Compatibility
Tools
Git • GitHub • GitLab • VS Code • Postman • Figma • Jira • Trello • Slack • Notion • npm • pnpm • Yarn
## How I Work
Every organization has unique goals, workflows, and operational challenges. Before writing code, I take the time to understand how your business operates, identify the bottlenecks, and design software that fits your processes—not the other way around.
My goal is simple: build reliable, maintainable software that continues creating value long after the first release.
Whether you need to launch a SaaS platform, modernize an existing CRM, automate business workflows, integrate AI capabilities, or scale an existing product, I'll help turn complex technical challenges into dependable, production-ready software.
TypeScript
Flutter
Dart
JavaScript
React
React Native
Node.js
Ionic Framework
Firebase
Firebase Cloud Firestore
API Integration
RESTful API
Android App Development
Mobile App Development
iOS Development
TETE BEN D.
Toulouse, France
$39/hr
4.6
21 jobs
5+ years Full-Stack Developer specializing in Next.js/React.js, Prismic, Strapi, Headless CMS, and Shopify development, with a background in Computer Science and Mathematics. I craft dynamic applications using NextJS, ReactJS, TypeScript, Strapi, Prismic, and Shopify, excelling at building robust, scalable e-commerce platforms and custom themes that enhance user experiences.
Looking for someone to deliver a seamless, high-quality application on time and bring your project to life? I’m your guy.
TypeScript
Next.js
React
JavaScript
Redux
Sass
HTML5
Strapi
GSAP
UI Animation
Khairallah M.
Paris, France
$50/hr
4.9
9 jobs
I help founders, startups, SaaS teams, and business owners turn AI ideas into products that actually ship. I build RAG systems, AI agents, and full-stack SaaS powered by LLMs, using LangChain, FastAPI, and Next.js.
Whether you're a business owner who wants your documents and workflows to answer questions on their own, or a technical founder who needs an LLM wired into a real backend, I connect modern AI to production systems so you get something intelligent, fast, and maintainable - not just a prototype. With an engineering background and years of full-stack experience, my focus is AI products that hold up in the real world, not demos that fall over the first time a user does something unexpected.
What I deliver:
- RAG pipelines: your team or customers chat with your own documents, databases, and APIs in plain language, with answers grounded in your sources instead of hallucinated
- AI agents: multi-step, tool-using automations that complete real work, not just answer questions, built with LangChain and LangGraph
- LLM-powered chat: ChatGPT-style assistants over your internal data (PDFs, CRMs, Notion), so your team stops digging for answers manually
- Full-stack AI SaaS: Next.js with FastAPI or NestJS, built and deployed as a real, maintainable product
- ML model integration: XGBoost, predictive pipelines, FastAPI inference serving
- Vector search: pgvector, ChromaDB, Pinecone, Weaviate
Recent projects:
- Lexicon, a RAG assistant that answers over your own documents
Teams and business owners sit on piles of PDFs and internal docs where the answers are impossible to find fast, and generic chatbots invent answers that were never in the source material. I built Lexicon end to end: a Next.js 14 frontend, a FastAPI backend, and a retrieval pipeline over a vector store. Documents get chunked, embedded, and searched by meaning, then an LLM answers using only the retrieved passages and links back to the exact source each answer came from. If the documents do not cover the question, it says so instead of guessing. The result is natural language Q and A over a private knowledge base with cited, trustworthy answers rather than hallucinations - the difference between an AI you can put in front of customers and a demo you cannot.
Tech stack:
- AI and LLMs: LangChain, LangGraph, RAG, AI agents, LLM tool calling, OpenAI API, Anthropic Claude API, vector databases
- Frontend: React, Next.js (App Router), TypeScript, TailwindCSS, shadcn/ui
- Backend: FastAPI, Node.js, NestJS, Express, GraphQL, microservices
- Databases: PostgreSQL, pgvector, MongoDB, MySQL, Redis, Pinecone, Weaviate, ChromaDB
- ML: Supervised Learning, Unsupervised Learning, Neural Networks, Deep Learning, predictive modeling, end-to-end ML pipelines
- DevOps: Docker, AWS (EC2, S3, Lambda), CI/CD, Git
If you're a business owner or founder who wants an LLM wired into your product, a RAG system over your data, or a full-stack AI SaaS shipped end to end, send me a message and tell me what you're building. I'll come back with a clear plan.
TypeScript
LangChain
Retrieval Augmented Generation
OpenAI API
Large Language Model
Vector Database
FastAPI
Next.js
Python
Prompt Engineering
Docker
Amazon Web Services
AI Agent Development
Automation
Ayyoub I.
Marseille 10, France
$25/hr
5.0
4 jobs
Need a fast, secure, and modern website or mobile app? I’m here to help!
I’m a passionate full-stack developer with experience building scalable web and mobile apps for startups and growing businesses. From concept to deployment, I’ll work with you to turn your vision into reality.
✅ E-commerce stores
✅ Custom dashboards
✅ Mobile-first apps
✅ WordPress websites
✅ API integrations
Tech Stack: JavaScript / TypeScript, Angular, PHP, WordPress, Symfony, HTML/CSS, Bootstrap, Tailwind, Firebase.
Let’s build something great together 🚀
TypeScript
Web Development
Web Application
Android App Development
App Development
Bootstrap
Shopify
JavaScript
Angular
Firebase
React
Web Design
Responsive Design
PHP
WordPress
Elijah M.
Anglet, France
$40/hr
5.0
3 jobs
Hi, I’m a Full Stack AI Developer from New Zealand, now living in France, fluent in both English and French. I have proven experience turning complex ideas into intelligent, production-ready solutions. My journey began with a curiosity for automating everyday tasks in Python, which grew into a deep passion for building AI-driven systems, web platforms, and mobile applications that deliver real business impact.
I help startups and enterprises transform manual processes into smart, scalable technology. From developing LLM-powered chatbots and RAG knowledge assistants to creating workflow automation tools and full-scale web apps, I combine engineering precision with creative problem solving. Clients often describe my work as practical, efficient, and thoughtfully designed for long-term growth.
I specialize in designing AI systems that understand, learn, and act. I’ve built applications using LangChain, OpenAI, Hugging Face, and custom embedding models connected to vector databases like Pinecone, FAISS, and Chroma. My automation background includes building data pipelines, intelligent agents, and backend APIs that integrate seamlessly with internal tools or external services.
On the web side, I develop with FastAPI, Next.js, React, Node.js, and Supabase, ensuring performance, security, and scalability from day one. For mobile, I deliver cross-platform experiences using Flutter and React Native, giving users a consistent and smooth interface across all devices.
My approach is simple: understand your vision, architect the system properly, and build it with clean, maintainable code that can evolve with your product. I care deeply about delivering real results—whether that means reducing workflow time, increasing automation efficiency, or helping you bring an innovative AI product to life.
If you’re looking for someone who can bring together artificial intelligence, automation, and full-stack development into one cohesive solution, I’d love to collaborate. Let’s create something that not only works, but makes an impact.
Web Development
DevOps
Full-Stack Development
Node.js
Next.js
Python
Vue.js
AWS Development
Docker
REST API
GraphQL
PostgreSQL
Machine Learning
Data Engineering
pandas
Ayoub B.
Argenteuil, France
$60/hr
5.0
23 jobs
I build production-grade audio plugins, real-time 3D tools, and AI-powered software for startups and studios from C++/JUCE DSP engines to WebGL configurators and AI pipelines, shipped end to end.
My strength is combining rigorous engineering with design precision: the result is software that's not just functional, but fast, polished, and easy to use.
Core skills:
Audio/DSP : JUCE, C++23, VST3/AU/CLAP, FFmpeg, custom plugin GUIs
3D/XR : Three.js, WebGL, WebXR, Unity, Unreal Engine, OpenGL, Blender
AI/ML : Python, PyTorch, OpenCV, RAG, FastAPI, automation workflows
Full-Stack : Next.js, React, Electron, Node.js, Cloudflare-native architectures (Workers, D1, R2) for SaaS products and creative tools
I work best as an ongoing technical partner on retainer or for multi-phase builds for teams shipping complex creative or AI-powered software. Happy to scope shorter projects too, but I do my best work when I'm involved from architecture through launch.
TypeScript
C++
C#
Python
Rust
Audio Engineering
Audio & Music Software
Digital Signal Processing
AI Consulting
Cloudflare
FFmpeg
Next.js
PostgreSQL
Three.js
WebGL
Unreal Engine
Unity
Blender
AI Agent Development
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