Hazem A.

Implemented Progressive Web App (PWA) with service worker caching, offline functionality, and automatic updates,

boosting user engagement by 40%.

• Delivered a 10x-scalable real-time legal AI platform using event-driven microservices, Redis pub/sub, SSE streaming,

WebSockets, and Alibaba Cloud, achieving 99.9% uptime and 75% latency reduction.

• Optimized caching and APIs using TTL expiry, LRU eviction, memory tuning, connection pooling, request debouncing,

async processing, and TanStack Query, achieving sub-100ms cache hits and sub-200ms API responses (p95).

• Built a distributed content ingestion pipeline with semantic chunking for RAG optimization using Node.js, processing

HTML (Mozilla Readability) and PDF documents with metadata enrichment and 99.9% reliability.

• Implemented RabbitMQ producer-consumer architecture with Dead Letter Queues and batching strategies, improving

I/O throughput by 300% and reducing disk writes.

• Developed rate limiting infrastructure using token-bucket algorithm per user session, preventing API abuse while

maintaining 99.9% service availability.

• Established robust observability and fault-tolerance with health checks, PM2 process management, real-time queue

monitoring, retry/backoff logic, circuit breakers, and automatic failover, cutting downtime by 95%.

• Ensured OWASP Top 10 compliance, multi-layer rate limiting (user/IP/global), and secure token generation with 256-

bit entropy and HMAC-SHA256 signatures.

• Engineered Redis ZSET-based sliding window rate limiter with configurable time windows and efficient expiration.

• Implemented database optimization strategies including connection pooling, composite indexing, and migration system

with dry-run and rollback support, reducing query response time by 60%

Designed and implemented high-performance, scalable software solutions to support global SaaS products at Trilogy.

• Worked within a distributed global team to enhance existing applications, focusing on code refactoring, infrastructure

modernization, and performance reliability.

• Led code reviews and technical design sessions, mentoring junior engineers to maintain high coding standards and best

practices.

• Collaborated with cross-functional teams (product managers, QA, and support) to ensure technical solutions aligned with

business objectives and product strategy.

• Adopted modern development practices, including continuous integration, automated monitoring, and cloud infrastructure

management, ensuring system stability and smooth release cycles

Successfully delivered high-quality software solutions for 190+ clients, spanning web applications, e-commerce

platforms, and custom solutions.

• Developed secure, scalable full-stack applications using modern technologies, improving performance, usability, and

client satisfaction.

• Specialized in e-commerce optimization for WordPress and Shopify, enhancing site speed, UX, and conversion rates.

• Designed and implemented robust APIs for seamless integration with third-party systems, ensuring reliability and

scalability.

• Maintained a client-centric approach, earning Top-Rated Freelancer status for consistent excellence and timely

delivery.

• Mentored junior developers and collaborated with cross-functional teams to ensure best practices in software design

and deployment.

Designed and implemented robust RESTful APIs, enabling seamless integration with front-end applications and third-party

services.

• Engineered and optimized relational (MySQL/PostgreSQL) and non-relational (MongoDB/Redis) databases for high-

performance, scalable data management.

• Improved application performance through code profiling, query optimization, and caching strategies, reducing server

response times significantly.

• Collaborated with cross-functional teams to ensure technical solutions aligned with business objectives, driving

efficiency and product quality.

• Implemented automated testing and monitoring, improving system reliability and minimizing downtime.

Streamlined development workflows using Git, Bash scripting, and automated unit/integration tests, improving code

quality and delivery speed.

• Implemented custom database logic with SQL scripts, stored procedures, Mongoose middleware, and plugins, enhancing

reliability and maintainability while minimizing network traffic.

• Optimized MySQL queries and implemented database replication, boosting performance and scalability.

• Provisioned and scaled multiple server instances using Puppet and Nginx load balancing, reducing response latency by

200ms.

• Automated deployment and server management with Fabric, improving operational efficiency and reducing errors.

• Leveraged Datadog for real-time monitoring, performance tracking, and issue resolution.

Optimized DOM rendering in React applications using memoization and virtualized lists for large datasets, improving performance and

load times.

• Developed a Magento/Hyva cart drawer featuring real-time price updates, regional tax calculations (NALA/EMEA), and a

lazy-loaded upsell carousel to enhance user experience.

• Configured and deployed Magento 2 eCommerce platform with ElasticSearch using Docker; integrated automated CI/CD

testing via Bitbucket Pipelines

Developed responsive and user-friendly web interfaces using HTML, CSS, and JavaScript.

• Collaborated with clients to implement design specifications and optimize UI/UX.

• Ensured cross-browser compatibility and mobile responsiveness across projects.

• Maintained and updated frontend codebases for ongoing freelance projects.

Beni-Suef University | Minor in Biotechnology

Holberton School | Minor in Back-end Engineering