Hasan Siddiqui

• Designed a fully serverless, event-driven system using AWS Lambda, SQS, and AppSync, handling 1,000+ RPS with JWT-based authentication ensuring secure and scalable APIs. • Built a fault-tolerant microservices backend leveraging .NET 8 and FastAPI, achieving 99.99% uptime through automated retries, and observability with CloudWatch. • Led GraphQL adoption across .NET Core and Python services via AWS AppSync, eliminating 70% over-fetching, and significantly improving integration and productivity.

• Engineered distributed microservices using AWS Lambda, SQS, and .NET 6, addressing architectural bottlenecks and scalability across regions. • Automated CI/CD pipelines using Azure DevOps, improving deployment success rate to 99%. • Developed cross-region, event-driven workflows using Power Automate Desktop, increasing order throughput by 64% and reducing operational errors by 82%, aligning with high-availability goals.

• Rebuilt JWT-based authentication in React JS, leading to a 90% reduction in token-related incidents and enhancing client-side security. • Optimized SQL Server queries and IIS configurations, significantly improving document API response times. • Contributed to full-stack development of RESTful APIs using .NET Core, and ensured seamless integration with modern JavaScript (ES6).

• Led cloud migration of public health apps to Azure Hybrid Cloud, achieving 99.9% SLA compliance. • Migrated legacy systems using Azure Table Storage, Azure Functions, and Azure AD B2C for 40,000+ users. • Developed GDPR-compliant data masking tools with C# and Azure Storage for various file formats. • Resolved a 20-year-old memory leak issue in a legacy service built on COM+.

• Integrated Authorize.Net payment gateway with 30+ test cases for fraud prevention. • Enhanced order processing with automation, leading to a 38% increase in processed orders and improved cus- tomer satisfaction.

• Improved multi threaded data scraping tools, enhancing daily batch performance. • Built time-sheet authorization and blob storage systems for media handling.