Mostafa A.

Data scientist with a 100% Job Success Score and almost 7,000 hours on Upwork since 2021. I build AI tools that let people talk to their data, credit scoring models, and the data pipelines behind them. My own product: Query Cat Query Cat lets anyone ask a question about their data in Arabic or English and get the answer, a chart and the SQL behind it. I designed and built it end to end. - Runs on local models (Ollama), so company data stays on its own servers. Cloud models are optional. - Every generated query passes a safety check: SELECT only, dangerous commands blocked, read-only database user. - Personal data is masked before any call to a cloud model. - Connects to 12 database types plus Excel, CSV and REST APIs, with live dashboards. If you want a tool like this for your company, built on your data, I can set it up for you. What else I can do for you: - Credit scoring and risk models: scorecards (WoE/IV, logistic regression, XGBoost, LightGBM), validated with AUC, Gini and KS. In my full-time role at a microfinance lender I built models that score more than 290,000 customers, under IFC supervision. - AI chatbots and LLM tools: chatbots that understand Arabic and English and answer from your documents or database, on local or cloud models. - Web scraping and data collection: Python and Scrapy. Clean, deduplicated data delivered to CSV, Excel, Airtable or a database. - Data cleaning, ETL and dashboards: scheduled pipelines with validation and logging, Plotly Dash and Streamlit dashboards with automated email alerts. Past work on Upwork: - Data Steward for one client for three years (6,381 hours). - Clinic listings collected and organised into an Airtable base. - Annotation and evaluation of training data for HuggingFace models. - ETL and machine learning for an Upwork enterprise client. - A lip reading model that reads speech from silent video. Tools: Python, SQL, pandas, scikit-learn, XGBoost, LightGBM, LangChain, Ollama, FastAPI, Next.js, Scrapy, Plotly Dash, PostgreSQL, Oracle, Docker, AWS. Send me a message with what you need. I usually reply within a few hours.