William Connolly

Contributed to a cloud-native payment platform built with C#, .NET 8, ASP.NET Core, and Azure, supporting payment processing workflows across e-commerce, retail, and high-risk merchant environments. Developed and enhanced backend microservices for payment orchestration, merchant onboarding, and transaction processing; built REST APIs with reliability, idempotency, and resilient transaction handling; developed operational dashboards in Angular to improve visibility of settlements, transactions, and payment exceptions; contributed to event-driven processing using Kafka and Azure Service Bus; improved application performance via SQL Server query optimization, indexing, and EF Core tuning; supported containerized deployments with Docker and AKS; enhanced Azure DevOps CI/CD pipelines and deployment automation; strengthened security with JWT authentication, RBAC, encryption, and PCI-aligned secure development; and developed unit/integration tests with xUnit and Moq.

Architected scalable backend services using C#, .NET 6/8, and ASP.NET Core Web API, supporting enterprise platform capabilities and high-throughput workloads with 99.7% service availability. Designed and implemented event-driven systems using Kafka; led cloud-native architecture initiatives across Azure App Services, Azure Functions, Docker, and AKS; defined API security standards with JWT, OAuth2, RBAC, and OWASP-aligned practices; optimized backend performance through SQL Server tuning, Redis caching (reducing API response times by 16%), and frontend analytics; designed responsive Angular frontends and dashboards; established frontend architecture standards and collaboration with product/UX teams; led AI-powered moderation and classification using Python, OpenAI APIs, LLMs, embeddings, and RAG pipelines; built data pipelines with Python, Pandas, and Elasticsearch; mentored junior and mid-level engineers; collaborated with Product, QA, DevOps, and Data Engineering teams.

Built and enhanced backend services using C#, .NET Core, ASP.NET Web API, and microservices; improved maintainability and deployment across teams. Developed React and TypeScript frontend applications to improve community/moderation UX. Implemented backend integration services using Node.js and PostgreSQL; designed and optimized RESTful APIs; improved PostgreSQL query performance and indexing. Used RabbitMQ for asynchronous processing of notifications and background jobs. Built and maintained CI/CD pipelines using Azure DevOps and Docker; collaborated with Product, QA, UX, and DevOps teams in Agile/Scrum to deliver iterative improvements.