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Hi, I’m William Kelly—a Senior Full-Stack Engineer and Cloud Architect with over a decade of experience building scalable, cloud-native systems for aviation, consulting, and technology partners. I thrive on transforming complex requirements into reliable microservices and high-availability architectures. I’m proficient in .NET Core, Node.js, C#, React, Angular, SQL Server, Azure, and AWS, and I enjoy leading teams to deliver fast, secure software solutions with a strong focus on performance and customer impact.…Hi, I’m William Kelly—a Senior Full-Stack Engineer and Cloud Architect with over a decade of experience building scalable, cloud-native systems for aviation, consulting, and technology partners. I thrive on transforming complex requirements into reliable microservices and high-availability architectures. I’m proficient in .NET Core, Node.js, C#, React, Angular, SQL Server, Azure, and AWS, and I enjoy leading teams to deliver fast, secure software solutions with a strong focus on performance and customer impact.

William Kelly

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Hi, I’m William Kelly—a Senior Full-Stack Engineer and Cloud Architect with over a decade of experience building scalable, cloud-native systems for aviation, consulting, and technology partners. I thrive on transforming complex requirements into reliable microservices and high-availability architectures. I’m proficient in .NET Core, Node.js, C#, React, Angular, SQL Server, Azure, and AWS, and I enjoy leading teams to deliver fast, secure software solutions with a strong focus on performance and customer impact.…Hi, I’m William Kelly—a Senior Full-Stack Engineer and Cloud Architect with over a decade of experience building scalable, cloud-native systems for aviation, consulting, and technology partners. I thrive on transforming complex requirements into reliable microservices and high-availability architectures. I’m proficient in .NET Core, Node.js, C#, React, Angular, SQL Server, Azure, and AWS, and I enjoy leading teams to deliver fast, secure software solutions with a strong focus on performance and customer impact.

Available to hire

Hi, I’m William Kelly—a Senior Full-Stack Engineer and Cloud Architect with over a decade of experience building scalable, cloud-native systems for aviation, consulting, and technology partners. I thrive on transforming complex requirements into reliable microservices and high-availability architectures.

I’m proficient in .NET Core, Node.js, C#, React, Angular, SQL Server, Azure, and AWS, and I enjoy leading teams to deliver fast, secure software solutions with a strong focus on performance and customer impact.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

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Expert

Expert

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Expert

Language

English

Fluent

Work Experience

Senior Full-Stack Engineer and Cloud Architect at JetBlue Airways

June 1, 2021 - December 1, 2025

Architected and deployed a cloud-native microservices platform using .NET Core, Node.js, and Azure services to support pricing and loyalty programs, improving scalability and reliability for millions of passengers. Orchestrated microservices with Docker and Kubernetes, integrated with Azure DevOps CI/CD pipelines, enabling 90% faster deployments, a 70% gain in developer productivity, and 99.99% uptime during peak travel seasons. Designed and optimized complex MS SQL Server and Azure SQL schemas, leveraging T-SQL and SSIS for ETL pipelines that processed baggage and loyalty data, delivering a 35% increase in ETL efficiency. Built an event-driven messaging architecture using Azure Service Bus for pub/sub to synchronize check-in, baggage tracking, and real-time operations. Developed Azure Functions with Blob Triggers to automate real-time processing of e-tickets and boarding passes, reducing delivery costs by 25%. Secured sensitive data with Azure Key Vault and integrated ASP.NET Core Ide

Senior Full-Stack Engineer at ThoughtWorks

May 1, 2018 - May 1, 2021

Led 7 projects across ASP.NET Core, C#, React, Angular, and JavaScript, collaborating with global clients to meet strict SLAs and compliance requirements. Designed and implemented 3 enterprise-grade microservices using ASP.NET Core, Azure SQL Server, and Entity Framework Core, with RESTful and GraphQL APIs to support multi-tenant data models with high reliability and performance. Built responsive, cross-device UI using React and Angular (HTML5, CSS3, TypeScript) and modernized legacy monoliths by migrating to a React-based architecture with Redux and TypeScript, reducing page load times and contributing to a 15% revenue increase for a key retail client. Migrated infrastructure to a serverless model on AWS using Lambda, API Gateway, and DynamoDB, automating deployments with CloudFormation and CodePipeline, lowering infrastructure costs by 30% and deployment times by 60%. Implemented SSO with Azure AD B2C and improved login speed by 30% while reducing brute-force attack risks by 25%. Est

Back-End Engineer at MentorMate

July 1, 2015 - May 1, 2018

Built backend systems for two large-scale projects from scratch and revamped eight existing applications, contributing to a microservices architecture using ASP.NET, Angular, and RabbitMQ, achieving a 50% drop in response times and a 70% faster page load speed which increased user engagement by 50% for a major retail client. Modernized legacy ASP.NET MVC apps by migrating to ASP.NET Core, delivering a 70% faster page load and a 50% increase in user engagement. Designed and deployed data-driven applications on Azure using ADO.NET, Azure SQL Database, and Azure Data Factory for streamlined data processing. Spearheaded the launch of a real-time application using ASP.NET and SignalR, driving a 40% boost in real-time user interactions and reducing server workload by 25%.

Senior Full-Stack Engineer

May 1, 2018 - May 1, 2021

Led 7 projects across ASP.NET Core, C#, React, Angular, and JavaScript-based frameworks, collaborating with global clients to meet strict SLAs and compliance. Designed and delivered 3 enterprise-grade microservices applications with ASP.NET Core, Azure SQL Server, and Entity Framework, exposing RESTful and GraphQL APIs for multi-tenant data with reliability and performance. Migrated client infrastructure to serverless AWS Lambda, API Gateway, and DynamoDB, automating deployments with AWS CloudFormation and AWS CodePipeline, reducing infrastructure costs by 30% and deployment times by 60%. Implemented SSO with AWS Cognito and Azure AD B2C, improving login speed and security. Established automated CI/CD pipelines with Azure DevOps and Jenkins, integrating Mocha/Jest/Selenium for tests, reducing post-release defects and boosting customer satisfaction. Guided a team of engineers through Agile/Scrum rituals and JIRA-based workflows.