Python application architecture
Splitting into modules and services, choice of patterns, managing technical debt, documenting decisions.
Python · PCEP · PCAP
Certified Python expert in Lyon: architecture, backend and AI
Sébastien Mizrahi is a software architect and certified Python expert (PCEP, PCAP) in Lyon. He designs and develops backends, AI platforms and business tools in Python, from architecture to production.
Python is now the language of backends, automation and artificial intelligence. You still need an architecture that holds up: splitting into services, asynchronous tasks, tests, deployment.
That is what I bring to your Python projects, with twenty years of software behind me, including critical software in C++ and Python for a medical device.
Services
What I do for you
Backends, APIs and asynchronous tasks
Services and APIs in Python (FastAPI, Flask), background processing with Celery, Docker containers and Kubernetes orchestration.
AI and LLM integration
Model routing with LiteLLM, local RAG, actions through MCP and n8n, Deep Learning with TensorFlow and Keras.
Quality, tests and code takeover
Code reviews, automated tests, audit of an existing code base and a prioritised recovery plan.
Redesign of SOGo, an open source groupware
Architecture proposal, technical studies and a POC of a MAPI server, then development of the calendar, the contacts and an asynchronous agent: a Python/Flask API on Kubernetes, with tasks handed to Celery.
Python · Flask · Kubernetes · Celery · Docker Read the case study →Multi-client AI chatbot platform
Architecture and development: LLM routing through LiteLLM, local RAG, actions (Python/HTTP hooks, MCP, n8n), web, Telegram, WhatsApp and local voice, with privacy as a design principle.
Python · FastAPI · LiteLLM · RAG · MCPLaser cataract surgery robot
Calibration software, embedded development, OCT and phaco integration for a medical device; organisation of the software team and code reviews.
C++ · Python · MISRA · IEC 62304GEO audit SaaS for getting cited by AI
Co-founder and technical architect: analysis of web pages to optimise their citation by answer engines, Python/Flask architecture and LLM workflow.
Python · Flask · LLM · CI/CD Certifications
PCEP and PCAP Python certifications
Two international certifications from the Python Institute, which you can check on my Credly profile. Credly profile.
PCEP: language fundamentals
- Data types and variables
- Conditional statements and loops
- Functions and data structures
- Algorithmic logic
PCAP: advanced programming
- Object-oriented programming
- Modules and packages
- Exception handling
- Application structure and good practice
Python · FastAPI · Flask · Celery · Docker · Kubernetes · LiteLLM · RAG · MCP · TensorFlow · Keras · pytest
Frequently asked questions
Your questions, my answers
Which Python certifications do you hold?
The PCEP and PCAP certifications from the Python Institute. PCEP validates the fundamentals of the language (types, control structures, functions, data structures), PCAP covers object-oriented programming, modules and packages, exception handling and structuring applications. The badges can be checked on my Credly profile.
For which projects should you hire a freelance Python expert?
To design the architecture of an application, a business tool or a backend, to audit and harden existing code, to automate processing or to integrate artificial intelligence (TensorFlow, Keras, LLMs). I have used Python at Keranova and at Alinto, among others.
Do you only work in Lyon?
I am based in Chaponost, next to Lyon, and I also work remotely for companies anywhere in France or abroad.
Do you have a site dedicated to Python?
Yes: developpeur-python.com (in French) describes in detail my freelance Python expertise in Lyon: backends and APIs with FastAPI or Django, artificial intelligence and LLMs, software architecture, with technical articles.
Let's get in touch
A demanding project? Let's talk architecture.
From Chaponost, near Lyon, on site or remotely. A quick reply with a first analysis of your needs.