Joel Zaky

Senior Full-Stack Software Engineer with 7+ years of experience building and shipping production web and mobile applications for international clients. Experienced in developing AI-powered products using Large Language Models (OpenAI, Claude) and Retrieval-Augmented Generation (RAG). Proven ability to design scalable architectures, optimize application performance, and deliver high-quality software across web and mobile platforms.

Key achievements include reducing feature development time by 30% through reusable component architecture and improving document-grounded AI answer accuracy by 25% with a custom RAG pipeline.

Senior Software Engineer - RefreshCode

(2023-08 - 2025-04)

• Led the architecture, development, and deployment of production-grade web applications using Next.js, React, TypeScript, and Node.js.
• Designed scalable frontend and backend systems while maintaining high standards for code quality and release stability.
• Built AI-powered features including prompt engineering, streaming responses, and tool calling using OpenAI and Claude APIs.
• Developed cross-platform mobile applications using React Native and Expo, delivering native experiences for both iOS and Android from a shared codebase.
• Implemented CI/CD pipelines with over-the-air (OTA) updates to streamline mobile releases.
• Engineered a Retrieval-Augmented Generation (RAG) system in Python and Ollama using embeddings and vector search, increasing document-grounded answer accuracy by 25%.
• Optimized real-time AI query pipelines through caching, batching, and asynchronous I/O, significantly improving latency and throughput.
• Architected reusable shared component libraries that reduced feature development time by 30%.

Full-Stack Developer - Altitude

(2021-08 - 2023-06)

• Enhanced and maintained scalable web applications using React.js, Next.js, Node.js, and TypeScript.
• Designed and executed RESTful APIs and backend services supporting production applications.
• Collaborated with designers, product managers, and backend engineers to ship customer-focused features, reducing average delivery time by 20%.
• Improved application performance through code optimization and efficient data handling.
• Participated in code reviews, debugging, testing, and deployment to ensure software quality.

Frontend Developer - Studio Bureau

(2019-09 - 2021-05)

• Built responsive, interactive user interfaces using React, JavaScript, and TypeScript.
• Developed reusable UI components and implemented modern styling solutions using CSS, SCSS, and CSS-in-JS.
• Collaborated with backend developers to integrate APIs and improve overall application performance.
• Optimized frontend rendering and maintained clean, reusable component architecture.
• Delivered pixel-perfect implementations across modern browsers and devices.

Bachelor of Computer Science - Computer Science - Windesheim University of Applied Sciences (2014 - 2018)