• Platform Modernization: Spearheaded the migration of Myket, an Android marketplace with over 26 million active users, from a monolithic MVC architecture to a distributed SOA. Refactored tightly coupled services into independent ones, improving maintainability, performance, and scalability.• Refactoring and Quality Improvements: o Extensively refactored critical services, including social community and messaging systems, reducing errors and achieving 100% availability for the purchase service (up from 65%). o Introduced the Adapter pattern and abstraction techniques to enhance maintainability. o Integrated Sentry for error tracking, improving system reliability through robust logging and monitoring.• Organizational Culture Building: Conducted workshops, including presentations on Refactoring by Martin Fowler and Domain-Driven Design by Eric Evans, fostering a culture of clean coding practices.• Process Optimization: Developed Git hooks and bash scripts for commit validation and automated code quality checks, streamlining source control workflows.• System Monitoring & Error Reduction: Enhanced logging strategies to proactively identify issues, reducing user-reported errors significantly.• New Feature Development: Collaborated with stakeholders to analyze market demands, design features, and implement scalable solutions, aligning product growth with user needs.

• Scalable E-Commerce Platform Development: o Enhanced performance for a platform serving 2 million users and 40,000 businesses by implementing CQRS and Repository patterns, optimizing SQL Server stored procedures, and reducing customer complaints significantly. o Improved maintainability by writing comprehensive tests, enabling smoother updates and reducing regressions.• Architectural Improvements: o Refactored a legacy MVC architecture into a Monolithic DDD design, identifying 8 bounded contexts and adding 5 new subsystems seamlessly. o Applied the Facade pattern for unified API endpoints across Android and iOS applications. o Used the Adapter pattern to integrate external providers, simplifying domain modeling.• New Project Initiatives: o Designed and developed backend services for new applications:  Appolo: A mobile sales app showcasing individual products.  bCard.ir: A web app for virtual business cards. o Delivered scalable RESTful APIs, enabling integration with various front-end technologies and launching applications three months ahead of schedule.

• ERP System Development: o Developed an ERP system using a microservices architecture for travel agencies. Designed and implemented three key microservices based on team analysis. o Detected and resolved design flaws, improving feasibility and quality through TDD.• Advanced System Design: o Utilized NServiceBus and RabbitMQ for inter-service communication, ensuring fault tolerance. o Implemented sagas for managing multi-task workflows, reducing failure risks. o Applied State Machine patterns to streamline domain state management.• Event-Driven Architecture: o Created domain events for event storming sessions, improving system design.• Knowledge Sharing: Conducted workshops on microservices and XP Programming techniques, enhancing team collaboration.

• Enhanced CMS Architecture: Migrated a monolithic MVC application to SOA, increasing customer onboarding efficiency by 50%.• Optimized Performance: Improved response times by rewriting synchronous workflows as asynchronous, achieving a 10x performance boost.• Efficient Search Implementation: o Deployed a web crawler for RSS-based news gathering tailored to client keywords. o Indexed SQL Server databases, reducing query times from 2 minutes to milliseconds. o Transitioned to MongoDB, significantly enhancing performance and scalability.• Improved Caching: Migrated from file-based caching to Redis, reducing page load latency by 90%.• Error Management: Developed a custom exception handler for improved error tracking and user experience.• Team Collaboration: Delivered training sessions on best practices, fostering a culture of continuous improvement.