• Engineered backend systems for a large-scale platform supporting film production workflows and cash rebate pro- grams up to 40%. • Designed a highly normalized database schema (200+ tables) to support complex business domains with scalability, consistency, and long-term maintainability. • Implemented multi-stage workflow engines for rebate processing, handling 150+ file types and 15+ interdependent forms with strict validation and business rules. • Contributed 70% of backend development, delivering 350+ RESTful APIs with optimized queries and performance- focused design.

• Engineered backend systems for a financial decision-support platform analyzing publicly listed companies and sector performance. • Designed a custom backend text processing algorithm and data processing pipeline to extract and structure financial data from OCR-generated reports, leveraging Elasticsearch-based search pipelines for high-accuracy retrieval. • Architected a normalized PostgreSQL schema (80+ tables) and implemented computation logic for 20+ financial ratios at both company and sector levels. • Processed 90+ financial reports across 32 firms (2021–2023) with 98% data extraction accuracy, enabling reliable financial insights and analysis.

• Sole backend engineer responsible for designing and delivering a full-scale employee management system supporting web and mobile applications. • Architected and implemented systems like Jira for task and project management, KPI tracking, attendance mon- itoring (check-in/out & breaks), rewards/voucher management, and performance evaluation. • Developed a comprehensive admin dashboard supporting employee accounts, departments, sites, shift scheduling, events, and role-based access control (RBAC). • Engineered a complex shift management module handling multi-constraint validation (site schedules, employee availability, qualifications, overtime rules, and template-based scheduling).

• Engineered backend systems for a commission-based platform with referral tree structures and integrated e-wallet management. • Designed optimized tree data structures and traversal algorithms (BFS) to efficiently process hierarchical referral networks and compute client network metrics for 6,000+ nodes in the tree. • Built high-performance query logic achieving 1.6 ms response time for complex network computations across 200k+ production records. • Contributed to a system generating 12M+ EGP revenue within 6 months ($220K USD), supporting scalable growth and financial operations.

• Architected and deployed a production system replacing a 15+ year manual Excel-based work for managing graduation projects for level 4 students in BIS department, Helwan University. • Designed role-based dashboards and strict ability-based access control serving students, supervisors, and administrators. • Engineered core workflows including multi-layer team registration validation, structured complaint lifecycle man- agement, queue-driven email notifications, and automated CLI pipelines for bulk data operations. • Reduced registration time from 4 months to 1 week, supporting 1,100+ students, 8,000+ student/admin/doctor sessions, 1,500+ system emails, and 32,000+ database records with zero downtime.

• Developed and deployed a production university course sections registration system supporting concurrent-safe enroll- ment using database-level locking to handle sections’ max capacity during high traffic. • Engineered a custom multi-rule validation engine to enforce complex constraints and academic policies.

Developed an open-source Laravel package that standardizes backend development patterns and accelerates API implementation across projects.

• Led the development of a knowledge-sharing platform aggregating curated learning resources (videos, playlists, articles, PDFs) and enabling community collaboration across programming tracks (C++, Java, PHP). • Owned system architecture and backend development, including database schema design, DevOps setup, testing, and frontend integration. • Implemented 80+ platform features, 25+ security safeguards, and 10+ performance optimizations. • Tools: HTML 5, CSS 3, Bootstrap 5, JavaScript, jQuery, JSON, Ajax, PHP 8, OOP, Design Patterns, SOLID, MySQL, Restful APIs, Apache Server, Linux Ubuntu, AWS EC2 & Route 53, Docker, Jenkins, Git & GitHub, Domain, SSL

• Developed core backend modules for supporting 60+ technical schools across Egypt (e.g., WE, Elsewedy, Banque Misr, National Bank of Egypt). • Built systems for student data management, administrator accounts, permission/privilege control, and exam hall & building management. • Implemented role-based access controls and performance optimizations while maintaining clean code. • Contributed 90% of the backend codebase, delivering 65 API endpoints and 37k lines of production code.