Julien Stitelet
Senior Backend & Data Engineer
Paris
Work Preference
Summary
Senior backend developer with 20 years of experience, I have worked on complex, high-stakes systems, mainly within software companies. Specialized in data-driven architectures, cloud technologies (AWS), and search engines (Elasticsearch/OpenSearch), I have often acted as a technical lead, guiding architectural decisions and ensuring code quality and performance. I aim to keep contributing as an expert to demanding projects focused on data, artificial intelligence, and intelligent search.
Overview
19
19
years of professional experience
Work History
Senior Backend & Data Engineer
CareerBuilder
Paris
10.2016 - Current
- Led the development of an LLM-powered CV parser (OpenAI, Google GenAI) with Langchain/LangGraph; deployed scalable infrastructure on AWS and exposed via FastAPI
- Designed a semantic search system for job matching (OpenSearch, embedding models); deployed with AWS Lambda/SQS and Python
- Partnered with data scientists to industrialize ML workflows (Metaflow, MLflow, SageMaker, AWS Batch)
- Contributed to architecture modernization (microservices with Docker, cost optimization, CI/CD, monitoring) across ~10 data projects
- Built and maintained a multilingual real-time CV search engine (Node.js/NestJS, Elasticsearch, AWS SQS/SNS)
Senior Developer / Tech Lead (E-learning SaaS)
Rosetta Stone
Montigny-le-Bretonneux
01.2012 - 09.2016
- Designed and developed a SaaS e-learning platform using SOA and microservices architecture (>2M lines of C#/.NET 4.5 code)quality
- Implemented unit and end-to-end testing to ensure software quality
- Acted as tech lead on multiple international projects (teams in China, India, USA)
- Led DevOps efforts: set up and managed continuous integration pipelines with TeamCity
- Stack: .NET (Web API, WebForms, MVC), MySQL, AngularJS
Lead Developer - SaaS & Enterprise Data Platforms
HISTOIRE D'ADRESSES
Paris
10.2007 - 12.2011
- Designed and implemented a SaaS platform for online company data search and purchase (ASP.NET WebForms, SQL Server, WCF)
- Developed lesbilans.com (ex: Les Echos' bilans-gratuits.fr) using ASP.NET MVC, SQL Server, and WCFWinForms
- Built a WinForms data entry application for ~20 operators (C#, SQL Server)
- Developed a back-office application for client account, order, and payment management (C#, WinForms, SQL Server)
- Actively contributed to application architecture and technical design decisions
Education
Bachelor's Degree - Computer Science, Information Systems Management
Evry University
01.2001
Higher Technical Diploma (BTS) - Management Information Systems
Lycée Parc de Vilgénis
01.2000
Skills
- Microservices
- GenAI
- AWS SQS
- Langchain
- Python
- OpenSearch
- Node
- JavaScript
- Nodejs
- OpenAI
- LangGraph
- Modèles d'Embedding
- NER
- Elasticsearch
- Metaflow
- MLFlow
- Distributed Processing Pipelines
- AWS Lambda
- AWS ECS
- AWS SNS
- AWS DDB
- AWS S3
- AWS Step Functions
- Docker
- Jenkins
- CI/CD
- Monitoring
- Infrastructure Scalable
- Serverless
- FastAPI
- Architecture Orientée Événements
Websites
Accomplishments
- Data Extraction Improvement, Increased extraction speed by 35% through algorithm optimization.
- Microservices Implementation, Developed 25 microservices, reducing operational costs by 25%.
- Cost Reduction Initiative, Achieved 40% reduction in CV processing costs by optimizing AWS architecture.
- Technical Project Leadership, Co-led a team managing over 2 million lines of C# code within SaaS projects.
Languages
Français
Anglais
Timeline
Senior Backend & Data Engineer
CareerBuilder
10.2016 - Current
Senior Developer / Tech Lead (E-learning SaaS)
Rosetta Stone
01.2012 - 09.2016
Lead Developer - SaaS & Enterprise Data Platforms
HISTOIRE D'ADRESSES
10.2007 - 12.2011
Bachelor's Degree - Computer Science, Information Systems Management
Evry University
Higher Technical Diploma (BTS) - Management Information Systems
Lycée Parc de Vilgénis