Rejeb Chaalia

Contributed to multiple production projects across marketing, logistics, legal tech, retail, and SaaS — taking full ownership from architecture design to cloud deployment. Backend & API Development – Designed and built RESTful APIs using FastAPI, Django, and Flask — covering authentication, business logic, and third-party integrations – Implemented event-driven and microservices architectures using Google Cloud Pub/Sub, Cloud Functions, and Cloud Run – Integrated advanced AI/LLM models (GPT, Mistral, LLaMA, Gemini) for intelligent document processing, classification, and automated summarization – Modeled relational schemas with SQLAlchemy + Alembic on PostgreSQL; used MongoDB for caching layers and Redis for real-time data handling Frontend Development – Built responsive user interfaces with ReactJS and React Native, consuming REST APIs with Material-UI – Developed dashboards for data visualization, client-facing reporting, and real-time result display DevOps & Cloud – Deployed and scaled services on GCP: Cloud Run, Cloud Functions, Pub/Sub, Firebase, and CS – Set up CI/CD pipelines with GitHub Actions for automated testing, linting, code coverage, and ZD deployment – Containerized applications with Docker; configured Nginx for load balancing and routing on self-managed VPS environments – Implemented distributed observability using OpenTelemetry, Uptrace, Prometheus, and Grafana Quality & Practices – Wrote comprehensive unit and integration tests with Pytest; enforced TDD and BDD practices throughout the development cycle – Led sprint planning, ticket management, and code reviews within Agile/Scrum teams – Maintained code quality standards using linting tools, DeepSource, and Codecov Tools: Python · FastAPI · Django · Flask · ReactJS · React Native · Material-UI · PostgreSQL · MongoDB · Redis · Docker · GCP · Firebase · GitHub Actions · Pytest · SQLAlchemy · Alembic · WebSockets · JWT · OpenTelemetry · Nginx · Haystack · LLMs (GPT / Mistral / LLaMA / Gemini)...

• Working for several projects using Django and Odoo • Develop new modules using Odoo • Customize existance modules depends on the request • Create a website for a company that aims to choose and then book the models using Django Framework. • Tools: Python, Django, Odoo, Flectra, Docker, Git, Postgres , sqlite, RestAPI, pytest, Digital-Ocean.

• Developing insurance web application that handle several problems in the insurance field and integrating a REST API architecture layer by communicating with 3 external software. I was responsible for analyzing tasks , solving problems , implementing solutions and fixing bugs . • Tools : Python , Django , celery , Git , Docker, Agile

• We were responsible of management and development of an Odoo platform that is responsible for data collection and analysing for European Union in Tunisia to help the country to manage the future jobs . • Tools : Python , Odoo 11 ,Digital Ocean

We were responsible for development and deployment of an ERP system for a company located on United Arab Emirates that combine between wordpress in front end and Odoo as backend to manage the company.