Olivier Delfosse
Senior AI Engineer | RAG & LLMOps
Salary / Daily rate
Nantes, France
Mobility: Paris
Freelance
Can come onsite
Skills
Languages
About me
Intro
I build and ship production GenAI systems and scalable architectures on GCP. Fractional CTO at Almo (PropTech AI). Built Robin des Droits, legal AI chatbot ranking on Google's first page. Previously: $700M+ payment infrastructure at Request Network (YC W17), ML/pricing at Cdiscount (€2B catalog). Background in data science and ML, evolved into backend engineering and cloud architecture. 9+ years building the full stack behind AI products. GCP Certified Cloud Architect. Freelance
Work experience
Fractional CTO
Almo
Mar 2026 - Present
8 months
Nantes, France
AI-powered platform matching retail space seekers with commercial brokers. 18,000+ active listings. Built: LLM enrichment pipeline (Gemini on Vertex AI, structured extraction with eval loop), listing quality scoring. Hybrid matching engine with deterministic score + Vertex AI Search cross-encoder semantic rerank. Stack: GCP · Vertex AI · Python · TypeScript (Next.js) · PostgreSQL (Supabase)
Technical founder
Robin des Droits
Feb 2026 - May 2026
4 months
Remote
Built and launched robindesdroits.com AI-powered legal chatbot helping individuals to contest parking fines: GenAI backend (inc. Langfuse), SEO/GEO strategy. - 200+ monthly users, ranking #1 on Google for targeted legal queries. Stack: GCP · Python (FastAPI) · Typescript (Next.js) · Firestore
Senior Backend & GenAI Engineer
CopilexFreelance
Dec 2025 - Jan 2026
2 months
Paris, France
Rearchitected the backend of a legal RAG system. Improved grounding accuracy and reduced hallucination rate by 18%. Stack: GCP · OpenAI · Python (FastAPI, LangChain) · React · PostgreSQL (pgvector)
Technical Founder – Fullstack & GenAI Engineer
Booklaxy
May 2024 - Nov 2025
1 year 7 months
Remote - France · Remote
Built and shipped booklaxy.com from scratch: AI book-summarization platform on serverless GCP. - Architected multi-model LLM pipelines (Gemini) with fault tolerance and evaluation - Built RAG system with MMR reranking and conversation memory: <2s latency, RAGAs evaluation - Designed event-driven microservices with full observability, CI/CD, 30% cost reduction via batching/caching Stack: GCP, Gemini, Python (FastAPI, LangChain), TypeScript (Next.js, React), MongoDB, PostgreSQL/pgvector
Senior Fullstack Engineer
Request Finance (YC W17)
Feb 2022 - May 2024
2 years 4 months
Remote
Scaled financial-grade backend infrastructure and frontend flows handling $700M+ in payments across regulated environments. - Batch-payment system: Co-designed and led full-stack development: multi-chain smart contracts, event-driven microservices, and payment UI enabling 100+ tx/batch, 40% gas reduction - Crypto-to-fiat system: Architected and owned end-to-end: PII-compliant data flows across 8 microservices, automated compliance, frontend integration, zero-downtime provider migration Stack: GCP, Terraform, TypeScript/NestJS, MongoDB, React/Web3, Solidity
Data Analyst & PMO Freelance
Data EngineerFreelance
Feb 2021 - Aug 2021
7 months
France · Remote
Built lead conversion pipelines across 5+ EU markets, powering dashboards for sales and leadership. Integrated CRM, internal APIs, and Snowflake data into Power BI for real-time reporting. Stack: Python, PostgreSQL, Snowflake, Power BI
Cdiscount
Jun 2017 - Jan 2021
3 years 8 months
Mexico City, CDMX, Mexico
Senior Data Scientist
Jan 2019 - Jan 2021
2 years 1 month
Mexico City, CDMX, Mexico
Led modeling for pricing, advertising, and product intelligence across a €2B catalog. Mentored junior data scientists and owned model design through production deployment. • Pricing models (elasticity, reinforcement learning): improved margins ~0.3 pp • Ad bidding optimization (€15M budget, multi-armed bandits): increased CTR ~2 pp • Semantic classifier (8000 categories): scaled 5x with hybrid embeddings MDF 2019 Final round in Python: French national coding competition Stack: Python, TensorFlow, Scikit-learn, PostgreSQL, Snowflake, Kubernetes, Docker
Data Scientist
Jun 2017 - Jan 2019
1 year 8 months
Mexico City, CDMX, Mexico
• Built pricing engine for 200k+ products (>€1.5B turnover): price elasticity • Improved semantic classification of products (8,000 categories): 5× performance
Data & Analytics Consultant
KPMG
Jun 2016 - Dec 2016
7 months
7620 Paris, Denmark
Data analysis and accounting automation at KPMG: executive dashboards, fraud detection, scraping.
Education
Arts et Métiers - École Nationale Supérieure d'Arts et Métiers
Master of Engineering (M.Eng.), Information and knowledge systems
2012 - 2015
3 years 1 month
Saint-Stanislas, NANTES
preparatory classes
2009 - 2012
3 years 1 month
Portfolio
Almo: GenAI-powered data pipeline for commercial real estate
