I’m Mohamed Hafez.I design reliable services, APIs, enterprise workflows, and client products from architecture through production support.

Northstar RAG System

An assistant that would rather say “I don’t have enough evidence” than make something up.

I independently built Northstar end to end, a hands-on RAG engineering project: a retrieval-augmented assistant that grounds every answer in a nine-document corpus and refuses rather than guessing when the evidence doesn’t support an answer.

• 9corpus documents
• 700characters per chunk
• 3source formats

My roleBuilt the RAG system end to end, from ingestion to Docker deployment.

• Python
• FastAPI
• LangChain
• sentence-transformers
• Chroma

Documentum Workflow & Lifecycle Optimization

The unglamorous code that proves a bank’s documents are exactly where they should be.

At BASS, I built and supported OpenText Documentum workflows that route banking clients’ documents through intake, review, and lifecycle states while proving they meet regulatory retention rules.

My roleImplemented and supported the workflows, DQL validation controls and health queries.

• OpenText Documentum
• DQL
• Documentum Composer
• Java
• Oracle Database

This Portfolio

The site you’re reading: four focuses, one grounded assistant that refuses rather than guesses.

I built this site: a four-focus engineering portfolio with typed, validated content and a grounded AI assistant that refuses rather than guesses.

My roleDesigned and built the site end to end, with the grounded assistant.

• Astro
• TypeScript
• Cloudflare Workers
• Workers AI
• Zod

Internal REST Endpoints & Client Proofs of Concept

Prototypes that behave like products: one JSON contract, one way to fail, documented for the next person.

At BASS, I built internal REST endpoints and client proofs of concept that bridged SOAP-based enterprise systems and clean, documented JSON contracts.

My roleBuilt the service layer, REST contracts and client demos.

• Java
• Spring Boot
• REST
• SOAP
• Python