J Imar Hussin

Designed and maintained 12 distributed ASP.NET Core and .NET 8 services processing ~2.1M monthly API requests, supporting a 99.95% availability target. Improved p95 response time from 1.8s to 1.08s by analyzing SQL execution plans, adding covering indexes, rewriting high-cost queries, and introducing application-level caching. Implemented event-driven workflows using RabbitMQ and asynchronous/background processing with idempotent consumers, retries, and dead-letter handling, reducing failed recovery recoveries by 60%. Led an AI platform pilot integrating OpenAI, Anthropic, and Google Gemini using provider-neutral .NET adapters, building AI agents/workflows and vector search (pgvector, OpenSearch). Containerized services with Docker, deployed via GitHub Actions to Azure App Service and Kubernetes, and ensured code quality using xUnit, API contract tests, and CI quality gates. Expanded observability with OpenTelemetry/Serilog/Application Insights and reduced MTTR by 45% through faster ro

Developed eight modular backend services and API integrations using C#, .NET 6/ASP.NET Core, Azure SQL, and PostgreSQL for business tools, client portals, and eCommerce platforms serving 600+ users. Integrated Stripe payments, SendGrid email, and HubSpot CRM APIs; secured webhooks with signature validation and implemented idempotency, async retries, and audit logging for ~150k monthly transactions/notifications. Delivered hybrid-cloud services on AWS (EC2, EKS, API Gateway, Lambda, SQS, S3) and OpenSearch, including Python serverless automation for document processing. Migrated legacy WinForms/ASP.NET to ASP.NET Core by decomposing tightly coupled modules into REST APIs, reducing dependency on desktop architecture. Built Azure DevOps CI/CD pipelines for Azure and AWS deployments, including Docker scanning, xUnit/Moq tests, integration tests, static analysis, and rollback controls—raising release frequency from monthly to weekly. Authored technical specs, sequence diagrams, API contra

Delivered inventory, logistics, and eCommerce features using C#, ASP.NET MVC, .NET Framework, React, Entity Framework, and SQL Server across multiple client implementations. Built reporting/data-access modules covering 1.2M+ inventory records to improve self-service access to purchasing, stock, fulfillment, and logistics. Implemented Kafka-based inventory events and RabbitMQ background processing for high-volume synchronization workflows handling up to 100k daily stock and shipment updates. Developed Python ETL/ELT jobs consolidating operational data into GCP BigQuery and added automated data-quality reconciliation. Migrated production applications from on-premises IIS to Microsoft Azure with repeatable deployment scripts, health checks, centralized configuration, and secure secret management. Collaborated with developers and QA on code review, NUnit/API regression tests, and technical documentation to deliver client enhancements on schedule.