Hadi Sajjadi

Full Stack Developer

Karizma Studio

Jun 2023 – Present · Iran · full-time

Leading full-stack development of web-based gaming platforms, backend infrastructure, and internal tools. Architecting scalable solutions for high-traffic gaming applications with real-time multiplayer capabilities.

• Architected and developed Baziness, a comprehensive web-based game store with payment integration and user management
• Built robust .NET Core backend services handling real-time game state synchronization for multiplayer games
• Developed and deployed web clients for 3 major games: "Tas o Takht", "Achmaz", and "Mench" with WebGL optimization
• Engineered internal admin panels and analytics dashboards for game management, player behavior tracking, and revenue monitoring
• Implemented AI-powered content generation systems to create dynamic game content and automate repetitive tasks
• Optimized game performance for WebGL platforms, achieving 60fps on mid-range devices
• Designed and implemented RESTful APIs and WebSocket connections for real-time game interactions

Full Stack Developer

Zeitoon Fintech Company

May 2020 – Jun 2021 · Iran · full-time

Led development of mission-critical fintech applications including insurance platforms, payment processing systems, and digital marketplaces. Architected microservices-based solutions handling thousands of daily transactions.

• Architected and developed a comprehensive insurance comparison platform similar to "Azki", integrating with multiple insurance providers via RESTful APIs
• Built a secure multi-currency payment gateway supporting international transactions with real-time currency conversion and fraud detection
• Designed and implemented microservices architecture for scalable fintech operations, improving system reliability by 40%
• Developed an Android marketplace platform similar to CafeBazaar and Google Play, handling app distribution, payments, and user reviews
• Implemented secure payment processing systems with PCI DSS compliance and encryption standards
• Created automated deployment pipelines using Docker and CI/CD practices, reducing deployment time by 60%
• Integrated third-party APIs for payment gateways, insurance providers, and financial data services
• Optimized database queries and implemented caching strategies, improving application response time by 50%

Front-End Developer

Quiz of Kings

Jan 2020 – May 2020 · Iran · contract

Designed and developed an interactive quiz game with AI-powered content generation.

• Designed and developed an interactive quiz game from ground up, handling both backend and client
• Created a content management system for quiz administrators to easily add, edit, and manage question banks
• Used AI systems to create questions periodically

Developed bespoke web applications for various clients from concept to deployment.

• Developed a suite of bespoke web applications for various clients, from concept to deployment
• Led the full-stack development of high-traffic e-commerce platforms, optimizing for performance and user experience
• Managed project lifecycles for multiple contractual projects, ensuring timely delivery and stakeholder satisfaction
• Integrated diverse APIs and third-party services to extend functionality and create seamless user interactions