Amine MNASSRI

Platform aggregating generative models (video, image, voice), with online payments and an internal token billing system, built end to end: architecture, backend, frontend and deployment.

• Multi-provider orchestrator (OpenRouter, fal, RunPod) with a circuit breaker and a fallback provider per modality.
• Append-only token ledger on PostgreSQL (SECURITY DEFINER functions, restricted application role): debit before submission and automatic reversal on provider failure, fully decoupled from AI providers’ billing.
• Proprietary prompt engine (RAG + LLM, pgvector) enriching requests with cultural and sector context.
• Voice and video studios: Tunisian-dialect voice-overs, talking avatars, video editing with smart chunking of long videos and resumable chunked uploads, dictation (Whisper / Vosk), content moderation.
• ClicToPay and Stripe payments with automatic reconciliation, invoicing, and a Next.js frontend in 5 languages (FR, EN, AR, ES, IT).
• Async FastAPI backend, Celery/Redis task queues, Alembic migrations, Docker deployment.

Multi-agent chatbot with a strict RAG architecture: no answer is ever generated outside the customer’s own knowledge base.

• Multi-agent pipeline orchestrated with LangGraph: intent router, FAQ/RAG agent and a grounding-check agent; when grounding fails, an explicit fallback message and hand-off to a human.
• Strict RAG on Qdrant (sentence-transformers embeddings) with the Claude API; audit log of every answer with the source passages used.
• Strict multi-tenant isolation: one vector collection per customer, queries and logs scoped per customer.
• Multilingual support (French, Tunisian Arabic dialect, English) with language detection.
• FastAPI / PostgreSQL / Docker backend; automated tests (pytest) on grounding, intent routing and multi-tenant isolation.

Dual role: leading the division’s generative AI initiative and modernizing the business-critical backend stack.

• Designed and deployed multi-agent systems (LangGraph, LlamaIndex) automating business workflows (customer support, document analysis, content generation).
• Built an internal RAG-as-a-Service platform: hybrid chunking, multi-model embeddings, hybrid vector + BM25 search and reranking.
• Set up GenAI observability with MLflow: prompt tracing, continuous evaluation, hallucination detection and cost-per-request monitoring.
• Deployed open-source LLMs for on-premise inference (vLLM, Ollama, AWQ/GPTQ quantization, batch inference): sensitive data kept in-house and inference cost reduced.
• Exposed agents and RAG through FastAPI microservices (async, streaming, Pydantic validation).
• Fine-tuned models with PyTorch and PEFT/LoRA.
• Standardized GitHub Copilot across the team.
• Migrated the critical stack: PHP 7 → 8.3, Symfony 4.4 → 6.4, React 16 → 19, with a full redesign of the core architecture.
• Raised test coverage from 0 to 88% (PHPUnit, Jest, Cypress) and PHPStan to level 8, the strictest.
• Migrated CI/CD from Bitbucket/Azure to AWS and GitHub Actions.
• Maintained the B2C ecosystem (Typo3 website, customer portal, Laravel APIs, Symfony/React payment app) under level-3 support; ran Scrum sprints and mentored developers.

• Developed and migrated the Audi Global Contacts ecosystem: 10 APIs, admin dashboards, Node.js microservices and gateways.
• Designed the Lead Management, Lead Scoring, Audi OnDemand, DataPlug, IDKIT and Bloctel modules and the Salesforce migration.
• Upgraded PHP 5.6 → 7.4 and Symfony 3.4 → 4.4; optimized API performance (NewRelic, Grafana, Kibana).

• Rebuilt the cart-delivery-payment checkout (11 Symfony applications) into an order-taking API and a Nuxt/Vue.js front end.
• Integrated new payment methods and improved conversion UX.

• Designed the architecture and built a PWA digitizing collective agreements and legal codes (Symfony, Polymer, MongoDB, Neo4j); managed dev and production servers.

• Led and built a real-estate CRM (KOMAXIS), a B2B AdWords platform (MadisonAds) and client websites (Symfony, AngularJS, WordPress).

• Developed the e-commerce CMS and CRM of Tunisia’s leading e-commerce platform, including payment gateway integrations.