Backends and APIs
REST services with FastAPI or Flask, data validation, authentication, OpenAPI documentation, access to SQL databases.
Python engineer · PCEP · PCAP
Freelance Python engineer: code that holds up in production
Sébastien Mizrahi is a software engineer who builds backends, AI platforms and business tools in Python. PCEP and PCAP certified, he works from Lyon for companies all over France.
Plenty of people can write a Python script. Delivering a service that can be tested, deployed and monitored, and that the team can still evolve three years from now, is an engineer's job.
I was a senior software engineer at Keranova, on a laser surgery robot where Python sat alongside C++ under the IEC 62304 standard. Since 2022, as a freelancer, I have been developing Python services for Alinto (SOGo 6) and for the Alfred AI platform.
I take care of the design as well as the development: project structure, choice of libraries, tests, continuous integration and going to production.
Services
What I do for you
Asynchronous tasks and automation
Task queues with Celery, data imports and synchronisation, scheduled jobs, command-line tools.
Tests and going to production
Automated tests with pytest, continuous integration, Docker images, deployment on Kubernetes.
Applied AI
LLM integration with LiteLLM, RAG on your documents, TensorFlow and Keras models for Deep Learning needs.
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 62304AI-augmented bookmark
Development of the artificial intelligence features of an AI-augmented bookmark.
Python · AI · Node.js Certifications
A certified Python engineer
The PCEP and PCAP certifications from the Python Institute validate command of the language, from the basics to object-oriented programming. 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 · pytest · SQL · Docker · Kubernetes · CI/CD · LiteLLM · TensorFlow · Keras
Frequently asked questions
Your questions, my answers
What is the difference between a Python developer and a Python engineer?
Both write code. The engineer also takes charge of the design: project structure, choice of libraries, tests, deployment and operations. That is the role I play on my assignments.
Which Python frameworks do you work with?
FastAPI and Flask for APIs, Celery for asynchronous tasks, pytest for tests, LiteLLM for LLMs, TensorFlow and Keras for Deep Learning. I also take over existing Django projects.
Can you take over an existing Python project?
Yes. I start with an audit of the code and its environment, then I propose a prioritised recovery plan. See the Python and C++ code audit.
Do you work remotely?
Yes, for companies all over France. I am based in Chaponost, next to Lyon, and I travel when it helps. See also Python consultant across France.
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.