I build backend systems and occasionally go deeper than I need to - like writing a database engine from scratch to understand what sits under the ORMs I use every day.

Currently finishing a B.Sc. in Electrical Engineering at Alexandria University and looking for backend engineering roles.

FetchDB  ·  Relational database engine, from scratch

NestJS TypeScript Binary I/O Parser

A working SQL-over-HTTP engine built without any database libraries. The goal was to understand storage and query execution at the level most engineers never touch.

• Character-level lexer → Pratt parser → typed AST → execution
• Append-only binary storage with O(1) primary key lookup
• MVCC-inspired row versioning - full history preserved, no data loss
• Promise-chaining mutex for FIFO write ordering
• Schema versioning with rollback to any prior table state
• Supports: SELECT INSERT UPDATE DELETE CREATE TABLE - full WHERE expression evaluation (no subqueries), ORDER BY, LIMIT

LinkGate  ·  Multi-role URL shortener

NestJS TypeScript Prisma PostgreSQL

• Three access tiers (public, private, group) with authorization enforced at the query level via Prisma - not in application logic
• Group membership modeled as a junction table with role and status enums
• Uniqueness handled with a hex generator and length-scaling retry loop - no pre-insertion check needed

Job Finder  ·  REST API with multi-role auth

Node.js TypeScript Express PostgreSQL Sequelize JWT

• JWT auth with refresh token rotation across three user roles
• Normalized PostgreSQL schema (3NF) with indexes on high-frequency query columns

SANAD  ·  Autonomous wheelchair + smart home backend - graduation project, in progress

Node.js Express WebSockets UDP ROS Jest Supertest Swagger

• REST API and WebSocket gateway bridging a remote client with onboard wheelchair hardware over a real-time network boundary
• Smart home module using UDP broadcast for zero-config device discovery - each device runs a minimal HTTP server exposing GET /state and POST /control
• Full device and wheelchair state published to ROS so other system modules can interact through standard ROS interfaces
• Feature-based module structure (Singleton + Builder patterns) replacing a layered monolith
• Jest/Supertest integration tests for all completed endpoints; Swagger/OpenAPI docs for hardware team integration

Node.js · TypeScript · NestJS · Express.js
PostgreSQL · MongoDB · Redis · Prisma · Sequelize
REST · WebSockets · Socket.io · Swagger/OpenAPI
JWT · OAuth2 · RBAC · Refresh Token Rotation
Jest · Supertest · Docker · CI/CD · GitHub Actions · Linux